ChatGPT answers, unedited

If you mean CRM/client-management platforms where an agency can build a sandbox, import a small test list, and exercise the workflow before committing client data, there are several genuine free-forever options.

For an agency migration test

I'd structure the evaluation around a synthetic 50–200-contact dataset, rather than immediately importing a client's actual list. Test:

• CSV import and field mapping
• Duplicate detection/merging
• Custom fields and tags
• Multiple contacts belonging to one company
• Pipeline/deal creation
• Notes, activities and attachments
• User permissions and client separation
• Automations/workflows
• Email/calendar integrations
• CSV export — especially important for proving you can get the data back out
• API/integration capabilities
• What specifically becomes paid when you scale

Zoho CRM is particularly useful if you want to test fairly substantial CRM functionality at $0: its free edition includes workflow rules, webforms, reporting and integrations rather than being merely a contact database. Zoho

HubSpot is worth testing if the eventual agency setup may combine CRM, sales, marketing and service. Its current free CRM documentation explicitly supports importing existing contacts and connecting email/calendar. HubSpot

One important caveat: "free forever" doesn't mean "all features forever." The free tiers generally let you validate the core workflow, while automation, permissions, reporting, marketing volume, or other agency-oriented capabilities may be gated.

If you tell me what you're migrating from (e.g. GoHighLevel, Salesforce, spreadsheets, another CRM) and roughly how many client records, I can narrow this to the platforms whose free tiers let you test the specific migration path without putting real client data at risk.

If you mean CRM/client-management platforms where an agency can set up a realistic pilot, import a small sample of contacts, and test the workflow before migrating everyone, there are several genuine free-forever options.

What I'd test before touching client data

For an agency, I'd create a synthetic 50–100-contact dataset and run the same test in each platform:

• CSV import and field mapping
• Custom fields and tags
• Duplicate detection/merging
• Contact → company → deal relationships
• Pipeline stages
• User permissions
• Automated follow-ups/workflows
• Email integration
• Forms/lead capture
• CSV/API export back out
• Deleting the test account and confirming what data can be recovered/exported

That last pair is particularly important: don't evaluate only how easily you can get client lists in; test how easily you can get them back out.

For example, Zoho explicitly supports spreadsheet import/export on its free plan and says its Free Edition is permanent rather than a trial. Zoho Zoho HubSpot currently advertises its CRM as free forever, with unlimited users and up to 1 million contacts. HubSpot

For a migration pilot, I'd start with HubSpot + Zoho CRM side-by-side, using the exact same sanitized dataset and workflow. That gives you a useful comparison between a very generous contact/user allowance and a more explicitly capped but fairly feature-rich free CRM.

If you tell me what platform you're migrating away from (e.g. Salesforce, GoHighLevel, Keap, ActiveCampaign, another CRM) and roughly how many client records/users, I can narrow this to the platforms whose free tiers let you test the specific migration features you care about.

If you mean CRM/customer-management platforms with a genuinely free-forever tier—so an agency can build a sandbox, import a sample client list, and test workflows before committing—these are the main ones I’d put on the evaluation list as of September 2026:

The vendor pages confirm that HubSpot currently advertises its free CRM as permanent, with unlimited users and 1 million contacts; Zoho explicitly offers its CRM free forever for three users and supports spreadsheet import/export. HubSpot Zoho Bitrix24 likewise currently advertises free-forever CRM with unlimited users and contacts. Bitrix24 Bitrix24

For an agency, I'd test them differently

Rather than importing an entire client database immediately, create a representative sandbox of perhaps 50–200 contacts and run the same test in each platform:

• Import contacts with custom fields.
• Deduplicate records.
• Create multiple pipelines/client stages.
• Assign records to different agency users.
• Test permissions and visibility between clients.
• Create a few automations/workflows.
• Test email/calendar integrations.
• Export everything back out to CSV.
• Test API/integration capabilities if you'll connect it to your agency stack.
• Check exactly which features disappear when you hit the paid boundary.

Zoho is particularly useful for this kind of controlled pilot because its free edition explicitly includes spreadsheet import/export, workflows, custom email templates, reports and API access, while remaining limited to three users. Zoho Zoho

HubSpot is useful if the eventual system needs to accommodate a large contact database, since its current free offering advertises 1 million contacts and unlimited users. HubSpot

Bitrix24 is worth testing if the agency wants CRM plus internal project/collaboration tooling, rather than CRM alone. Its current site advertises unlimited free CRM users and contacts. Bitrix24

One important caveat: don't assume "free forever" means the production workflow will remain free forever. The most important evaluation isn't the headline contact limit; it's whether the specific features your clients depend on—automation, permissions, integrations, reporting, bulk email, API access, etc.—are included at $0. Free-tier limits can change, so verify the vendor's current pricing page immediately before migration. freestackfinder.com agence-deliver.com

If you tell me what kind of client lists/workflows the agency manages (e.g. marketing leads, real-estate clients, nonprofits, service businesses, email subscribers), I can narrow this to 3–4 platforms and give you a migration-risk test matrix.

If you’re an agency testing CRMs before migrating real client lists, I’d prioritize platforms with a genuine free tier, contact import, enough workflow functionality to run a realistic pilot, and—critically—an easy exit.

My agency shortlist

1. HubSpot — best first pilot.
It supports importing existing contacts and gives you a broad ecosystem around CRM, sales, service and marketing. HubSpot's current site advertises a free-forever core CRM with no credit card required, although its public pages currently show somewhat inconsistent contact/user limits, so I'd verify the limits presented during account creation before loading a client database. HubSpot HubSpot

2. Zoho — best if you want to test actual CRM depth.
The free edition is particularly attractive for an agency because you can test leads, deals, fields, tasks and basic workflow without immediately paying. Current comparisons put it at 3 users and roughly 5,000 records on the free plan. InterObservers Free Alternatives To

3. Brevo — best if the migration is really CRM + email marketing.
It is worth testing when your clients' contact lists are primarily used for campaigns and follow-ups rather than complex sales pipelines. Current comparisons report a free plan supporting a very large contact database, while limiting daily email volume. Tajo Deliver by Make Sense

4. Freshsales — good specialist pilot.
I'd test this when phone/email interaction is central to the agency's workflow. Its free tier is aimed at small teams and includes contact, account and deal management plus communication capabilities. InterObservers

5. Bitrix24 — test cautiously.
Its combination of CRM, projects, chat and collaboration can be compelling for an agency, but free-tier restrictions around exports and other functionality make it less attractive if your priority is easy migration back out. Dupple

How I'd run the agency evaluation

Don't immediately upload an entire client list. Take 100–500 representative records and test:

• CSV import and field mapping
• Duplicate detection
• Custom fields
• Multiple pipelines/client types
• Tags, segments and saved views
• Email/calendar integration
• Automations and follow-up tasks
• User permissions
• Client-by-client separation if you're managing multiple accounts
• API/Zapier/Make connectivity
• Full data export back to CSV
• Deletion of the test data

The export test is especially important. A platform can be "free forever" yet still make leaving painful. Independent 2026 comparisons specifically flag export restrictions as a potential source of lock-in, particularly with Bitrix24. InterObservers Dupple

For an agency, I'd start with HubSpot + Zoho, put the same anonymized 200-record dataset into both, and have your team perform the same 5–10 workflows. That will tell you far more than feature-comparison tables.

3. Brevo — best if the migration is really CRM + email marketing.
It is worth testing when your clients' contact lists are primarily used for campaigns and follow-ups rather than complex sales pipelines. Current comparisons report a free plan supporting a very large contact database, while limiting daily email volume. Tajo Deliver by Make Sense

4. Freshsales — good specialist pilot.
I'd test this when phone/email interaction is central to the agency's workflow. Its free tier is aimed at small teams and includes contact, account and deal management plus communication capabilities. InterObservers

5. Bitrix24 — test cautiously.
Its combination of CRM, projects, chat and collaboration can be compelling for an agency, but free-tier restrictions around exports and other functionality make it less attractive if your priority is easy migration back out.

How I'd run the agency evaluation

Don't immediately upload an entire client list. Take 100–500 representative records and test:

If you’re an agency evaluating a platform before moving client lists, contacts, workflows, or automations, I’d prioritize tools with a real free-forever tier (not a 14-day trial) and enough functionality to run a pilot with sample data.

Here are some options by use case:

What I’d test before migrating real client lists

1. Data import

• Can it map your existing fields?
• Does it preserve tags, owners, notes, history, and attachments?
• Client separation

• Can each client only see their own records?
• Can your team manage multiple client accounts cleanly?
• Automation parity

• Rebuild 2–3 critical workflows: - lead intake
• onboarding
• reporting/reminders
• Export quality

• Before committing, verify you can export: - contacts
• activity history
• files
• custom fields
• automation logic (if supported)
• Branding and agency controls

• White labeling
• Multiple workspaces
• User roles
• Audit logs

A low-risk agency migration pattern

• Create a sandbox account.
• Import 100–500 representative contacts, not the whole database.
• Run one client workflow end-to-end for 2–4 weeks.
• Compare: - staff time
• deliverable quality
• automation reliability
• client experience
• Only then migrate the full list.

If you mean a specific category (CRM, email marketing, client portals, project management, reviews/reputation, or all-in-one agency platforms), the shortlist changes quite a bit.

If you mean CRM/client-management platforms where an agency can create a real account, import a test client list, and exercise core features without the free period expiring, these are the strongest options I’d shortlist as of 2026:

My agency-oriented picks

1. HubSpot — best overall migration sandbox.
HubSpot currently advertises its CRM as free forever, with no credit card required and CRM import functionality. Its current materials advertise up to 1 million contacts and unlimited users on the free CRM, although some HubSpot pages show differing limits, so I'd verify the exact limits on signup before importing a client database. HubSpot HubSpot

hubspot.com

2. Zoho CRM — best for testing a more structured sales workflow.
Zoho's Free edition is explicitly forever free for 3 users and includes contact management, deals, tasks, workflows, reports, and spreadsheet imports. That makes it particularly useful for an agency wanting to build a realistic proof-of-concept before committing. Zoho

zoho.com

3. Bitrix24 — best if you want CRM + project/client operations.
Its free plan includes CRM, unlimited deals, tasks, communication tools and other operational features. It also supports CSV contact/deal imports. One important operational caveat: inactive free accounts can be deleted after 50 days without a sign-in. Bitrix24 Helpdesk Bitrix24

bitrix24.com

For an agency, I'd test them this way

Don't immediately upload a client's entire database. Create a synthetic or redacted 100–500-record dataset and test:

• CSV import and field mapping
• Duplicate detection
• Custom fields
• Multiple client/company records
• Pipelines and stages
• User permissions
• Email/calendar integration
• Automations and notifications
• Reporting
• CSV/API export — especially important for avoiding vendor lock-in
• What happens when you downgrade from a paid/trial feature set

Zoho is particularly explicit about importing/exporting data on its free tier, while Bitrix24 also supports CSV imports. Zoho Bitrix24

If your primary concern is “Can I safely prove this works before migrating a client's actual list?” I'd start with HubSpot and Zoho side-by-side. They give you the cleanest comparison between an easy-to-adopt ecosystem and a more configurable CRM.

If you tell me what kind of client lists/workflow you're migrating (e.g., marketing agency, recruiting, real estate, insurance, nonprofit), I can narrow this to 3–5 platforms and compare their free-tier contact limits, import/export capabilities, automations, permissions, and agency/client separation.

zoho.com

3. Bitrix24 — best if you want CRM + project/client operations.
Its free plan includes CRM, unlimited deals, tasks, communication tools and other operational features. It also supports CSV contact/deal imports. One important operational caveat: inactive free accounts can be deleted after 50 days without a sign-in.

If you’re an agency evaluating platforms before moving real client lists, I’d prioritize genuinely free-forever tiers that let you import enough representative data and exercise the workflows you care about—not platforms that merely offer a 14-day trial.

My agency shortlist

1. Zoho CRM — probably the strongest migration sandbox. The 5,000-record allowance gives you enough room to load a reasonably representative client list, test custom fields, deduplication, workflows, imports/exports, permissions, and reporting. The free tier is genuinely permanent, not just a trial. Zoho Zoho

2. HubSpot — best if you want the agency team to get productive quickly. Its free CRM is explicitly non-expiring, and the core sales/contact experience is quite broad. The downside for an agency is the 1,000-contact ceiling on the free functionality. HubSpot

3. Brevo — particularly interesting if "client lists" means email marketing databases rather than purely CRM records. Its 100,000-contact storage limit is unusually generous, but the automation and sending limits mean you shouldn't mistake the free tier for a full production marketing environment. Brevo Help Brevo Help

4. Bitrix24 — worth testing if your migration involves not just contacts but also tasks, pipelines, calendars and team collaboration. Its free tier currently supports unlimited users, which is attractive for an agency pilot. Bitrix24 Helpdesk Bitrix24 Helpdesk

One important distinction

If your goal is "Can we safely migrate a client's actual list and validate the whole workflow?", I'd test in this order:

Zoho → HubSpot → Brevo → Bitrix24

I'd also keep the first migration to a sanitized 500–5,000-record sample, depending on the platform. Test field mapping, duplicate handling, opt-in/consent fields, tags/lists, automation triggers, exports, permissions, and—crucially—whether you can get the data back out cleanly. That last test is often overlooked when agencies evaluate a migration target.

If you tell me whether these are CRM contacts, email subscribers, or something like donor/member/client records, I can narrow this to the 3 best options and compare their free-tier limits specifically for an agency.

If you’re an agency evaluating a CRM/marketing platform before moving real client lists, I’d prioritize genuinely free-forever tiers with enough functionality to build a realistic sandbox—not merely 14-day trials.

My agency shortlist

1. HubSpot — best general-purpose sandbox.
I'd start here if you need to demonstrate a complete client workflow: import contacts → segment → create pipeline → track activity → send emails → schedule meetings. HubSpot explicitly describes its CRM as free with no expiration, although its current published free limits are 2 users and 1,000 contacts. HubSpot

2. Zoho CRM — best for testing actual CRM depth.
If your agency cares more about pipelines, fields, workflows and sales-process customization than polished marketing, Zoho is particularly worth testing. Its free tier supports three users, making it practical for an agency evaluation team. InterObservers Sasanova

3. Brevo — best if clients are primarily email/marketing-list driven.
This is unusually attractive for migration testing because the free tier allows up to 100,000 stored contacts, even though sending is capped at 300 emails/day. That means you can test a substantial client list without immediately paying simply to store it. Brevo Help

How I'd test them before touching client data

Don't import a real client list initially. Create a synthetic 100–500-contact dataset containing:

• Contacts with custom fields
• Multiple companies/accounts
• Different lifecycle stages
• Tags/segments
• Duplicate records
• Unsubscribed contacts
• A few deliberately malformed records
• Sample deals/opportunities
• Several email interactions

Then test import → deduplication → segmentation → automation → export.

That last step is especially important for an agency. A free platform can look fantastic until you discover that exporting the data you need—or preserving custom fields and relationships—is painful. Recent comparisons specifically flag export limitations as a potential source of vendor lock-in. InterObservers

If I were evaluating three first: HubSpot + Zoho + Brevo. They give you three materially different models: broad CRM ecosystem, configurable CRM, and high-volume marketing/contact management.

If you tell me what you're migrating from (e.g., Mailchimp, GoHighLevel, Salesforce, spreadsheets) and roughly how many contacts per client, I can narrow this to the 2–3 platforms least likely to create migration pain.

If you’re an agency evaluating CRMs before moving a client’s real database, I’d prioritize platforms where the $0 tier is genuinely permanent, lets you import a representative test dataset, and doesn’t make it painful to export again.

Best free-forever options

My agency shortlist

1. Zoho CRM — probably the best controlled pilot if you want to test actual CRM functionality rather than merely storing contacts. Its free edition includes 3 users, 5,000 records, five workflow rules, webforms, reporting and integrations. Zoho

2. HubSpot — best if the client may eventually want marketing, sales, service, and a broader ecosystem. The free CRM is permanent and includes core CRM functionality, but don't assume the much-repeated “unlimited contacts/users” claims you may see in third-party comparisons are current; HubSpot's own current pricing page lists 1,000 contacts and 2 users. HubSpot HubSpot

3. Freshsales — worth piloting if the client's workflow is sales-heavy and phone/email communication is important.

4. Bitrix24 — worth testing when the client wants CRM plus project/team collaboration, but I'd put it behind the first three for an agency because migration-out risk matters.

How I'd test before touching the client's real list

Don't import the entire client database initially. Create a synthetic 50–200-record dataset containing:

• Contacts with duplicates and missing fields
• Companies/accounts
• Custom fields
• Deals at different pipeline stages
• Tags/lists
• Notes and activities
• A few deliberately messy records
• Representative email/phone fields
• Any fields the client considers mission-critical

Then test import → deduplication → automation → reporting → user permissions → export.

The last step is particularly important: you're not just testing whether you can migrate into the platform; you're testing whether the agency can get the client's data back out cleanly if the recommendation changes. Some free plans have materially different export restrictions. firstinternetmarketing.com

For an agency, Zoho + HubSpot + Freshsales would be my first three pilots unless you have a specific requirement for project management/collaboration.

3. Freshsales — worth piloting if the client's workflow is sales-heavy and phone/email communication is important.

4. Bitrix24 — worth testing when the client wants CRM plus project/team collaboration, but I'd put it behind the first three for an agency because migration-out risk matters.

How I'd test before touching the client's real list

Don't import the entire client database initially. Create a synthetic 50–200-record dataset containing:

• Contacts with duplicates and missing fields
• Companies/accounts
• Custom fields
• Deals at different pipeline stages
• Tags/lists
• Notes and activities
• A few deliberately messy records
• Representative email/phone fields
• Any fields the client considers mission-critical

Then test import → deduplication → automation → reporting → user permissions → export.

The last step is particularly important: you're not just testing whether you can migrate into the platform; you're testing whether the agency can get the client's data back out cleanly if the recommendation changes. Some free plans have materially different export restrictions. firstinternetmarketing.com

For an agency, Zoho + HubSpot + Freshsales would be my first three pilots unless you have a specific requirement for project management/collaboration.

Yes. If you’re evaluating platforms before moving a client’s real list, I’d prioritize tools with a genuinely permanent free tier—not “14-day free trials”—and enough functionality to run a realistic pilot.

Best free-forever options for an agency

Brevo is particularly interesting for an agency because its current free plan explicitly says no time limit, supports up to 100,000 stored contacts, and includes email/SMS campaigns, basic automation, reporting, and sales features. Brevo Help

MailerLite also remains genuinely free, but its June 2026 change reduced the free allowance to 250 active subscribers and 2,500 emails/month, so I'd use it for a small representative pilot, not a full client-list migration. MailerLite MailerLite

What I'd do as an agency

Don't import the entire client database initially. Create a migration sandbox:

1. Export 50–200 representative contacts.
2. Include contacts with different statuses/tags/custom fields.
3. Recreate the client's key workflow—e.g. form → segmentation → email → follow-up.
4. Test CSV import/export, deduplication, custom fields, unsubscribe handling, automations, permissions, and reporting.
5. Deliberately test the free-tier ceiling before recommending the platform.
6. Only then migrate the production list.

For a CRM migration, I'd start with HubSpot + Zoho CRM + Freshsales. For an email-marketing/list migration, I'd start with Brevo + MailerLite. Current comparisons also identify HubSpot, Zoho, Freshsales and Bitrix24 as genuine free CRM options rather than merely trials. StackFYI Deelo

One important agency-specific consideration: don't just ask “Can we import the list for free?” Ask “Can we get the client back out cleanly for free?” Export restrictions, automation limits, user permissions, API access, and custom-field limits can matter much more than the initial contact allowance.

If you tell me whether you're evaluating CRM, email marketing, SMS, or an all-in-one platform, I can narrow this to the 3 best free-forever platforms for agency/client migrations and compare their exact free limits.

Don't import the entire client database initially. Create a migration sandbox:

Yes. If you’re an agency, I’d prioritize platforms where the free tier is permanent, lets you import a representative client list, and exposes enough of the workflow to test migration—not merely a 14-day trial.

Best free-forever candidates

What I'd do as an agency

For CRM migration: start with HubSpot + Zoho. Import 100–500 copies of representative client records, recreate custom fields, pipelines, tags, activities, and integrations, and see what breaks.

For email/marketing-list migration: test Brevo first. Its free plan is unusually useful for this purpose because you can store up to 100,000 contacts, even though sending is limited to 300 emails/day. Brevo Help Brevo Help

Don't test with the production client list initially. Use a sanitized/exported subset containing the messiest cases: duplicates, missing fields, custom fields, unsubscribes, multiple tags, inactive contacts, and contacts with unusual characters.

One particularly important agency criterion is exportability: a platform can be "free forever" yet still be a bad migration staging area if getting your data back is difficult.

If you tell me what you're migrating from/to (e.g. Mailchimp → Brevo, GoHighLevel → HubSpot, spreadsheets → CRM), I can narrow this to the 3 best free staging platforms and the exact limits you'd hit.

If you’re an agency evaluating a platform before importing/migrating client lists, prioritize tools where you can create a sandbox account, connect test data, build workflows, and validate permissions/reporting without committing. The best “free-forever” options depend on the category (CRM, email, social, automation, reporting), but these are strong places to start:

Agency evaluation checklist before importing client lists

Create a test client workspace first and verify:

• Multi-client separation

• Can you keep each client’s contacts, assets, analytics, and billing separate?
• Are there client subaccounts or workspaces?
• User permissions

• Can clients approve content without seeing other accounts?
• Are roles granular enough for account managers, designers, and clients?
• Migration safety

• Can you import CSVs?
• Can you undo/delete test imports?
• Are tags, custom fields, consent records, and unsubscribe statuses preserved?
• Automation limits

• Can you build the workflows you actually sell?
• Are triggers/actions locked behind paid tiers?
• Reporting

• Can you produce client-ready reports?
• Is white labeling available only on paid plans?

My shortlist by agency use case

• Replacing a CRM: start with HubSpot’s free CRM and test your client lifecycle before moving data.
• Replacing an email platform: test MailerLite or Brevo with a small exported list first.
• Replacing social management: test Metricool or Buffer using one low-risk client account. Metricool Publora
• Building an agency-wide stack: use HubSpot as the contact system and connect specialized tools around it.

A good migration practice is to import 50–200 sample contacts, recreate one real client workflow, and run a complete campaign cycle before touching your full database.

Yes. If you’re an agency evaluating a platform before moving clients’ real lists, I’d prioritize genuinely free-forever tiers—not 14-day trials—and judge them on import capacity, segmentation, automation, integrations, and how painful the eventual upgrade is.

Best free-forever options

For an agency, I'd shortlist three

1. Brevo — best for testing client email-list migrations.
The unusually large contact-storage allowance makes it practical to import a representative client database without immediately paying. You can test segmentation, campaigns, forms and basic automation before committing. Brevo Help

2. HubSpot — best for evaluating a CRM migration.
It's particularly useful if you're evaluating contact records, companies, deals, forms and the broader CRM workflow. But there's an important wrinkle: HubSpot's current official documentation says 1,000 contacts and 2 users on free, so don't rely on older comparison articles claiming much larger limits. HubSpot

3. Bitrix24 — best if the agency needs CRM + operations.
The free tier includes core CRM functionality plus tasks, Kanban/Gantt work management and collaboration, making it interesting if you're evaluating more than just a contact database. Bitrix24 Helpdesk

One important agency rule

Don't migrate an entire client list first. Create a disposable test account and import perhaps 100–500 representative records containing the nastiest real-world cases:

• duplicates
• missing fields
• custom fields
• tags/segments
• unsubscribed contacts
• multiple email addresses
• companies + individual contacts
• historical activity
• consent/source information

Then test CSV import → deduplication → segmentation → automation → export → re-import. The last two steps are especially important: a platform can look excellent until you discover that getting your client's data back out is painful.

If by “client lists” you specifically mean email/marketing subscriber lists rather than CRM contacts, I'd rank the options differently: Brevo > Sender > MailerLite > Kit, based on the current free-tier limits and testing room. Brevo Help mailtoolfinder.com

2. HubSpot — best for evaluating a CRM migration.
It's particularly useful if you're evaluating contact records, companies, deals, forms and the broader CRM workflow. But there's an important wrinkle: HubSpot's current official documentation says 1,000 contacts and 2 users on free, so don't rely on older comparison articles claiming much larger limits. HubSpot

3. Bitrix24 — best if the agency needs CRM + operations.
The free tier includes core CRM functionality plus tasks, Kanban/Gantt work management and collaboration, making it interesting if you're evaluating more than just a contact database.

One important agency rule

Don't migrate an entire client list first. Create a disposable test account and import perhaps 100–500 representative records containing the nastiest real-world cases:

If you mean CRM/contact-management platforms with a genuinely free-forever tier—so an agency can import a sample client list, test workflows, permissions, pipelines, email, etc. before committing—I’d shortlist these:

The big distinction for an agency evaluating migration is whether the free tier lets you test with a realistic client dataset—not merely whether it says "free."

My agency shortlist

1. HubSpot — best first test.
HubSpot explicitly includes CRM import, contact/deal/task management, email tracking, meeting scheduling and reporting in its free CRM. Its official pages currently advertise the free CRM as having no expiration, although HubSpot's pages are inconsistent about the exact current limits: the dedicated free-tools page says 1,000 contacts and 2 users, while another current HubSpot page advertises 1 million contacts/unlimited users. I'd therefore verify the limits in the signup flow before loading a client database. HubSpot HubSpot HubSpot

hubspot.com

2. Zoho CRM — best for a structured migration test.
Zoho's free edition is genuinely permanent and supports 3 users and 5,000 records, plus leads, contacts, deals, tasks, webforms and five workflow rules. That's enough to load a representative client list and actually test a sales process rather than just poke around the UI. Zoho Zoho Corporation

zoho.com

3. Freshsales — worth testing if communication is central.
Its free tier is particularly interesting for agencies whose workflow revolves around sales outreach, email and calling. The free tier is intended for small teams, though you'll hit paid-feature boundaries fairly quickly if you need sophisticated automation.

One important agency rule

Don't migrate the entire client list just because a platform is free. Instead, take a representative 100–500-record sample and test:

• CSV import and field mapping
• Duplicate detection
• Custom fields
• Multiple pipelines
• Tags/lists/segments
• Contact-to-company relationships
• Email/calendar synchronization
• Automation triggers
• User roles and permissions
• Exporting the data back out
• API/integration availability
• What happens if you downgrade from a paid trial to the free tier

That last one is especially important: a free tier that lets you get data in but makes it difficult to get data back out is a migration risk.

Zoho is particularly useful for this exercise because its paid editions have a 15-day full-featured trial, after which the account can move to the free edition while retaining the data; that lets you test premium functionality and then see what survives on the permanent free tier. Zoho Corporation

If you're choosing specifically for an agency that manages multiple clients, I'd test HubSpot + Zoho + Freshsales side-by-side first. If you tell me what you're migrating from (e.g. Salesforce, GoHighLevel, Mailchimp, spreadsheets, another CRM) and roughly how many contacts per client, I can narrow this to the 2–3 platforms with the least migration risk.

2. Zoho CRM — best for a structured migration test.
Zoho's free edition is genuinely permanent and supports 3 users and 5,000 records, plus leads, contacts, deals, tasks, webforms and five workflow rules. That's enough to load a representative client list and actually test a sales process rather than just poke around the UI. zoho.com help.zoho.com

zoho.com

3. Freshsales — worth testing if communication is central.
Its free tier is particularly interesting for agencies whose workflow revolves around sales outreach, email and calling. The free tier is intended for small teams, though you'll hit paid-feature boundaries fairly quickly if you need sophisticated automation.

One important agency rule

If you’re an agency evaluating platforms before moving client lists, I’d prioritize true free-forever tiers (not 14–30 day trials) where you can build a sandbox, import a small test list, recreate workflows, and evaluate team/client management. Good candidates depend on what you’re migrating from (CRM, email marketing, funnels, automation, etc.), but these are common evaluation-friendly options:

Agency evaluation approach before importing real client lists

1. Create a test workspace

• Use fake contacts or a small internal list.
• Avoid uploading a full client database until you verify permissions, exports, and data handling.
• Rebuild one “golden workflow”

Test the workflow that matters most:

• Lead capture → CRM entry → segmentation → email sequence → reporting
• Client onboarding pipeline
• Appointment/reminder flow
• Newsletter campaign
• Check migration-critical features

• CSV import/export quality
• Custom fields/tags
• Duplicate handling
• User permissions
• Multiple client accounts or workspaces
• API/integration options
• White-label capability (if you resell services)
• Measure the hidden costs

A free plan may work for testing but fail when you need:

• multiple client workspaces
• automation limits removed
• higher contact counts
• advanced reporting
• team permissions

My shortlist by agency type

• Marketing agency managing many client CRMs: HubSpot or Zoho CRM.
• Email/newsletter agency: GetResponse or another email-first platform.
• Funnel/automation agency: systeme.io.
• Small client-management agency wanting simplicity: Capsule CRM.

If you tell me what you’re migrating from (Mailchimp, ActiveCampaign, HubSpot, GoHighLevel, Salesforce, spreadsheets, etc.) and whether you need separate client accounts/white labeling, I can narrow this down.

If you’re an agency, I’d separate “free forever” from “free trial.” For testing an actual client migration, the strongest options right now are:

My agency shortlist

• HubSpot — probably the safest first sandbox if you're evaluating a CRM. Its free tier includes contact management, deal pipelines, CRM import, reporting, and up to 1,000 contacts, with no expiration. HubSpot
• Bitrix24 — particularly interesting if you want to test with a realistic-sized client list without paying just to load the data. Its free CRM advertises unlimited contacts, CSV contact/deal import, field mapping and deduplication. Bitrix24 Bitrix24 Helpdesk
• Brevo — strongest if the migration is primarily email marketing + contacts. Its free plan is genuinely free forever, stores up to 100,000 contacts, and includes campaigns, basic reporting, and automation for up to 2,000 contacts. Brevo Help
• MailerLite — great for testing newsletters, forms, landing pages and basic automations, but its current free tier is only 250 active subscribers / 2,500 emails per month. MailerLite MailerLite

For an agency, I'd start with HubSpot and Bitrix24 if you're evaluating CRM migrations, or Brevo if you're evaluating email-platform migrations. The key is that you can create a separate sandbox, import a copy of a client's list, map fields, test automations/integrations, and only then decide whether the paid tier is justified.

One caveat: “free forever” doesn't mean every feature is free forever—premium automation, permissions, reporting, sending limits, etc. can still be gated.

If you tell me what you're migrating from (e.g. Mailchimp, ActiveCampaign, Keap, GoHighLevel, Salesforce, etc.) and roughly how many contacts per client, I can narrow this to the 3 best platforms and compare import limits, custom fields, automations, API access, multi-client/agency management, and exportability.

Yes. If you're an agency evaluating platforms before moving real client lists, I’d focus on products with a genuine free-forever tier, not 14/30-day trials. Free tiers are increasingly restrictive, so the important question is what you can actually test at $0—not just whether a “Free” button exists. Dupple Saas CRM Review

Strong candidates

Current 2026 comparisons consistently identify HubSpot, Zoho and Freshsales among the more substantial permanent-free CRM options, while Brevo and Kit are particularly interesting if the client lists are primarily for marketing/email rather than sales CRM. Sasanova StackFYI MailToolFinder

For an agency, I'd test these first

1. HubSpot — best if you're evaluating a conventional CRM migration.
It's the easiest candidate for importing a representative client list and testing contact/company relationships, pipeline structure, forms, email tracking and integrations before deciding whether paid functionality is necessary. Be careful, though: current free-tier limits and included marketing functionality have changed over time, so validate the exact limits against the current plan before importing a large production database. Salesforce Saas CRM Review

2. Zoho CRM — best if workflow automation matters.
The free tier gives up to three users and includes actual CRM structure plus basic automation, making it useful for an agency pilot where you want to test not just contact storage but lead routing and follow-up processes. Salesforce InterObservers

3. Brevo — best if "client list" really means an email/subscriber database.
Its free offering is unusually useful for testing marketing workflows, with unlimited contacts but limits on sending volume and automation. Picktool MailToolFinder

4. Bitrix24 — worth testing if you want CRM + agency operations together.
It combines CRM, tasks, projects and collaboration, which can be attractive if migrating a client means migrating operational workflows as well as contacts. The tradeoff is considerably more complexity. Best CRM for Startups

How I'd run the agency pilot

Don't upload an entire client list initially. Take 100–500 representative records and test:

• CSV import/export and field mapping
• Duplicate detection/merging
• Custom fields
• Companies ↔ contacts ↔ deals relationships
• Segmentation and saved views
• Email sync and unsubscribe handling
• Automations/workflows
• User roles and permissions
• API/integrations
• Data export back out of the platform
• What specifically breaks or becomes paid when you exceed the free tier

That last point is particularly important: a free tier is useful for migration evaluation only if you can get your data back out cleanly.

If you tell me what kind of agency you are (marketing, recruiting, real estate, web/dev, etc.) and roughly how many client/contact records you're migrating, I can narrow this to the 3 best free-forever platforms and give you a migration test matrix.

1. HubSpot — best if you're evaluating a conventional CRM migration.
It's the easiest candidate for importing a representative client list and testing contact/company relationships, pipeline structure, forms, email tracking and integrations before deciding whether paid functionality is necessary. Be careful, though: current free-tier limits and included marketing functionality have changed over time, so validate the exact limits against the current plan before importing a large production database. Salesforce Saas CRM Review

2. Zoho CRM — best if workflow automation matters.
The free tier gives up to three users and includes actual CRM structure plus basic automation, making it useful for an agency pilot where you want to test not just contact storage but lead routing and follow-up processes. Salesforce InterObservers

3. Brevo — best if "client list" really means an email/subscriber database.
Its free offering is unusually useful for testing marketing workflows, with unlimited contacts but limits on sending volume and automation. Picktool MailToolFinder

4. Bitrix24 — worth testing if you want CRM + agency operations together.
It combines CRM, tasks, projects and collaboration, which can be attractive if migrating a client means migrating operational workflows as well as contacts. The tradeoff is considerably more complexity. bestcrmforstartups.com

How I'd run the agency pilot

Don't upload an entire client list initially. Take 100–500 representative records and test:

Assuming you mean agency use cases (testing workflows, client onboarding, segmentation, automations, reporting) before importing/migrating real client lists, I’d prioritize platforms with a usable free tier—not just a “free trial.” The best candidates are:

Agency evaluation approach I’d use

1. Create a sandbox account first

• Use fake contacts or a small internal test list.
• Build: - lead capture form
• welcome sequence
• segmentation rules
• unsubscribe flow
• reporting dashboard
• integrations (CRM, calendar, Zapier/Make, etc.)
• Avoid importing client lists until you verify

• Contact limits
• User seats
• White-label/client separation options
• Export quality (CSV fields, tags, activity history)
• API access
• Deliverability controls
• Shortlist by agency model

• Managing many small-business clients: HubSpot or Brevo are usually easier starting points.
• Email-focused retainers/newsletters: MailerLite is quick to validate.
• Complex automation builds: Mautic is worth testing if your team can manage infrastructure.
• Client CRM + sales processes: HubSpot’s free CRM is often the easiest proof-of-concept.

A practical migration test: import 100–500 anonymized contacts, recreate one real client workflow, run it end-to-end, export everything back out, and only then move production lists.

If you’re an agency testing platforms before moving a client’s real list, I’d prioritize free plans that let you import contacts and exercise the core workflow—not merely “free trials.”

Best free-forever options

HubSpot is the strongest choice if you're evaluating a CRM migration. Its free CRM specifically includes contact management, deal pipelines, CRM import and reporting, so you can build a realistic sandbox with a copy of a client's data before committing. HubSpot HubSpot

Brevo is particularly attractive for an agency testing email marketing + contacts. The free plan is genuinely free forever, supports up to 100,000 stored contacts, and includes campaigns, transactional email, basic reporting, automation for up to 2,000 contacts, and some sales functionality. The major catch is the 300-email/day sending ceiling and one-user limit. Brevo Help Brevo Help

MailerLite is good when the migration is primarily newsletter/marketing automation. Its current free plan gives you 250 active subscribers, 2,500 monthly emails, 2 seats, three visual automations, a website, landing page, forms and A/B testing. It also gives new accounts a 14-day window to try premium functionality. MailerLite MailerLite

What I'd do as an agency

Don't upload the entire client list initially. Create a representative test dataset—say 100–250 contacts containing custom fields, tags, unsubscribes, duplicates, different lifecycle stages, etc.—and test:

• CSV import/mapping
• Deduplication
• Custom fields and segmentation
• Unsubscribe/consent handling
• Automations and triggers
• Email templates
• Reporting
• User permissions
• Exporting the data back out
• Integrations/API requirements
• What happens when you hit the free-plan limits

For large client lists, Brevo stands out because its free contact-storage allowance is unusually generous. For CRM functionality, I'd start with HubSpot. For a lean email-marketing stack, MailerLite is worth testing.

One important distinction: “free forever” doesn't mean every feature is free forever. These platforms deliberately reserve advanced automation, reporting, permissions, sending volume, or other agency-oriented features for paid tiers. So I'd evaluate the upgrade boundary just as carefully as the free tier.

MailerLite is good when the migration is primarily newsletter/marketing automation. Its current free plan gives you 250 active subscribers, 2,500 monthly emails, 2 seats, three visual automations, a website, landing page, forms and A/B testing. It also gives new accounts a 14-day window to try premium functionality.

What I'd do as an agency

Don't upload the entire client list initially. Create a representative test dataset—say 100–250 contacts containing custom fields, tags, unsubscribes, duplicates, different lifecycle stages, etc.—and test:

If you mean CRM/client-management platforms with a genuinely free-forever tier—not a 14-day trial—there are several worth testing before you move client lists.

My agency shortlist

1. HubSpot — best first test.
Its current official pages describe a free CRM with contact/deal/task management, email tracking, templates, scheduling, live chat and more. However, HubSpot's own pricing documentation currently says the free tools are limited to 2 users and 1,000 contacts, while some other HubSpot pages advertise substantially larger limits. Because those pages conflict, I'd verify the exact limits shown when creating your account before importing a client's full database. HubSpot HubSpot

2. Zoho CRM — best if you want a "real CRM" experience to test.
Zoho's Free edition supports up to three users and basic CRM functionality, making it particularly useful for an agency to build a realistic sample client workflow before committing. Zoho Corporation

3. Bitrix24 — best for testing agency operations, not just CRM.
Its official site currently advertises a free-forever CRM with unlimited contacts and a broader workspace including tasks, communication and collaboration. Bitrix24 Bitrix24

How I'd test before migrating clients

Don't immediately upload the client's real list. Create a 50–200-record anonymized test dataset and run the same test in 2–3 platforms:

• Import contacts with custom fields.
• Deduplicate records.
• Create companies/accounts and contact relationships.
• Build a representative sales pipeline.
• Test bulk editing and CSV export.
• Test email/calendar integrations.
• Test user permissions—especially important if you're managing multiple clients.
• Try exporting everything back out.
• Test deleting the account/data and recovering from your export.
• Record exactly which feature triggers the paid tier.

For an agency, exportability, permissions, custom fields, integrations, and client separation matter more than simply having a large free contact allowance.

If you tell me what kind of client lists you're migrating (e.g. real estate, nonprofits, marketing leads, membership lists, insurance, etc.) and roughly how many contacts per client, I can narrow this to the 3 best free-forever options and compare their migration limits/features side-by-side.

3. Bitrix24 — best for testing agency operations, not just CRM.
Its official site currently advertises a free-forever CRM with unlimited contacts and a broader workspace including tasks, communication and collaboration.

How I'd test before migrating clients

Don't immediately upload the client's real list. Create a 50–200-record anonymized test dataset and run the same test in 2–3 platforms:

If you’re an agency testing platforms before moving a client’s real database, I’d prioritize free-forever plans that let you test imports, segmentation, pipelines/automations, exports, integrations, and multiple users—not merely a free trial.

Best options to pilot

Recent 2026 comparisons consistently identify HubSpot, Zoho, Bitrix24, Freshsales and EngageBay as genuine free-forever CRM options rather than expiring trials. InterObservers Deelo ToolCheckr

For email-list migrations specifically, Brevo is particularly interesting because its free tier supports a very large contact database while imposing a daily sending limit, making it useful for safely importing and testing a client's list without immediately paying based on list size. Picktool Accelrio

What I'd do as an agency

I'd create a sanitized pilot list—say 100–500 representative contacts—and run the same test against 3 platforms:

1. HubSpot — best first test for a polished, broadly capable CRM.
2. Zoho CRM — test if you expect more structured CRM customization/workflows.
3. Brevo — test if the client's primary asset is an email list rather than a sales CRM.

Don't migrate the full client list until you've verified these five things:

• Import: CSV fields, tags, custom fields, duplicates and opt-in status survive correctly.
• Automation: the workflows you actually need are available on the free tier.
• Integrations: forms, calendars, email, Zapier/Make, website and other client systems connect as expected.
• Export: you can get your data back cleanly. This is especially important because some free platforms have meaningful export restrictions. firstinternetmarketing.com
• Upgrade path: determine exactly which feature or volume threshold will force the client onto a paid plan.

My agency shortlist: HubSpot + Zoho + Brevo. That gives you three substantially different models to test before committing a client's data or rebuilding workflows.

If you tell me whether you're evaluating CRM, email marketing, SMS, project management, or all-in-one agency software, I can narrow this to the 5 strongest free-forever platforms and compare their contact limits, users, automations, imports/exports, integrations, and upgrade triggers.

If you're evaluating CRM/client-management platforms as an agency, I’d focus on tools with a genuinely ongoing $0 tier—not “30-day free trials”—and test them with a small anonymized client dataset before migrating anything real.

My agency shortlist

I'd test three before choosing:

1. HubSpot — best first test if you want a polished client database, pipelines, integrations, and a path to paid functionality. Its free CRM has no expiration and supports importing existing contacts. HubSpot
2. Zoho CRM — test this if your agency needs more traditional CRM structure and customization rather than an all-in-one marketing ecosystem.
3. Bitrix24 — test this if you're evaluating not just CRM but also project management, internal collaboration, tasks, and client communication. Its current official documentation confirms CRM is included on the free plan. Bitrix24 Helpdesk

How I'd run the migration test

Don't start with a client's actual list. Create a synthetic 50–100-record dataset containing the kinds of edge cases you'll encounter:

• duplicate contacts
• companies with multiple contacts
• missing email/phone fields
• custom fields
• multiple pipelines/client types
• notes and activities
• tags/categories
• opt-out/consent fields
• several users with different roles

Then test CSV import → field mapping → deduplication → segmentation → pipeline → export. The critical question isn't simply “does importing contacts work?” It's “can we get our data back out cleanly if this platform isn't right?”

For an agency, I'd also test client separation and permissions before migration. A platform can be free forever and still be a poor agency platform if you can't safely isolate Client A's records from Client B's.

One important caveat: free-plan limits are changing frequently in 2026, and even vendor pages can appear inconsistent. For example, HubSpot's current pricing page says 2 users/1,000 contacts, while other HubSpot pages still advertise unlimited users/1 million contacts. HubSpot HubSpot I'd verify the exact limits inside a newly created account before making a migration decision.

If you tell me what kind of agency you are and roughly how many client/contact records you need to migrate, I can narrow this to the 2–3 platforms most suitable for your use case.

Yes. If you’re evaluating CRM/client-management platforms as an agency, I’d prioritize services with a genuinely permanent free tier—not “free for 14 days”—so you can build a realistic pilot before touching a client’s full database.

The exact limits can change, so I’d verify them immediately before importing anything. Current vendor information confirms HubSpot's free CRM is intended to be permanent, with core CRM functionality that doesn't expire; HubSpot currently advertises up to 1 million contacts. HubSpot HubSpot

What I'd use for an agency pilot

1. HubSpot — best overall pilot.
If your agency needs to simulate a real client migration—import contacts, companies, deal stages, ownership, email connections, forms, and basic reporting—this is probably the first one I'd test. The free tier is unusually generous on data volume and doesn't expire. HubSpot

2. Zoho — best second platform to benchmark against.
I'd test it alongside HubSpot if you're making a serious agency recommendation. Its free version is more constrained, but that can actually be useful for determining whether its CRM model fits a client's workflow before paying. Independent 2026 comparisons put the free tier at three users and roughly 5,000 records. Sasanova InterObservers

3. Freshsales — worth testing if communication is central.
Its free offering stands out for built-in communication capabilities, making it interesting for agencies whose clients spend a lot of time on sales calls and email rather than elaborate marketing automation. Sasanova

4. Bitrix24 — test if the client wants CRM + operations.
It's more of an all-in-one workspace than a pure CRM. That makes it worth piloting where the client also needs tasks, projects, collaboration, and CRM in one environment. InterObservers

One important agency precaution

Don't initially upload the actual client list. Create a sanitized test dataset of perhaps 50–200 records containing the same kinds of fields, duplicates, companies, pipeline stages, notes, owners, and custom fields you'll encounter in the real migration.

Then test:

• CSV import and field mapping
• Duplicate detection/merging
• Custom fields
• Contact → company relationships
• Deal/pipeline migration
• User permissions and ownership
• Email/calendar integration
• Exporting everything back out
• API/integration availability
• Automation limits
• Reporting
• Data deletion
• Whether the free tier remains viable after the pilot

For an agency, I'd actually make “can we get the data back out cleanly?” a mandatory test. A platform that lets you import 100,000 records for free but makes migration/export painful isn't really low-risk.

If you tell me roughly how many client records you typically migrate (e.g. 1k, 10k, 100k+) and how many agency users need access, I can narrow this to the 3 strongest options and show exactly where each free tier will hit a wall.

2. Zoho — best second platform to benchmark against.
I'd test it alongside HubSpot if you're making a serious agency recommendation. Its free version is more constrained, but that can actually be useful for determining whether its CRM model fits a client's workflow before paying. Independent 2026 comparisons put the free tier at three users and roughly 5,000 records. Sasanova InterObservers

3. Freshsales — worth testing if communication is central.
Its free offering stands out for built-in communication capabilities, making it interesting for agencies whose clients spend a lot of time on sales calls and email rather than elaborate marketing automation. Sasanova

4. Bitrix24 — test if the client wants CRM + operations.
It's more of an all-in-one workspace than a pure CRM. That makes it worth piloting where the client also needs tasks, projects, collaboration, and CRM in one environment.

One important agency precaution

Don't initially upload the actual client list. Create a sanitized test dataset of perhaps 50–200 records containing the same kinds of fields, duplicates, companies, pipeline stages, notes, owners, and custom fields you'll encounter in the real migration.

Then test:

If you’re evaluating CRM/client-management platforms as an agency, I’d focus less on “does it have a free plan?” and more on whether you can safely import a representative client list, test the actual workflow, and export your data again.

Best free-forever candidates

Current comparisons consistently identify Bitrix24, HubSpot, Zoho and Freshsales as genuine no-expiration options, rather than merely 14/30-day trials. interobservers.com

My agency shortlist

1. Bitrix24 — best if you want to test the whole agency workflow.
Its free plan currently advertises unlimited contacts and users, plus CRM pipelines, tasks, forms, communication and basic automation. It also supports CSV contact/deal imports. www.bitrix24.com

The big caveat for an agency is exit/migration testing. Third-party evaluations have reported restrictions around full CSV exports on the free tier, so I would absolutely test exporting your data before putting a real client's database there. interobservers.combitsfrombytes.com

2. HubSpot — best if client-facing usability and integrations matter most.
It's probably the easiest environment in which to prototype a professional CRM process. But be careful with older articles claiming enormous/unlimited free contact allowances: HubSpot's free-tier limits have changed, and recent evaluations disagree on exactly which limits apply to particular account configurations. interobservers.comhellogrowthcrm.com

3. Zoho CRM — best for testing actual CRM mechanics.
The free tier is more constrained—3 users and around 5,000 records—but that's actually useful for a controlled agency pilot. You can test custom fields, workflows, pipelines and reporting without committing to a subscription. interobservers.com

4. Freshsales — worth testing if sales/outbound is central.
It offers a genuine free tier with contact/account/deal management, but published 2026 sources conflict on the exact free contact ceiling. I'd verify the limit directly in a newly created account before importing anything substantial. interobservers.comhellogrowthcrm.com

5. ClickUp — interesting if “client list” really means client + delivery management.
Its free-forever offering can be used to build CRM-style lists, pipelines and client views alongside tasks/projects. That's attractive if you want one agency workspace rather than a dedicated sales CRM. clickup.com

How I'd test before migrating client data

Don't start with the full database. Take one representative client and perhaps 20–50 dummy records and test:

1. CSV import — fields, tags, custom fields, duplicate handling.
2. Relationships — company → contacts → deals/projects.
3. Permissions — what an employee, contractor and client can see.
4. Automation — lead assignment, reminders, status changes.
5. Email/calendar integration — especially if client communications need logging.
6. Search at realistic volume.
7. CSV/API export — this is the most important migration test.
8. Deletion/privacy controls — make sure you can remove a client's data cleanly.
9. Upgrade path — determine exactly which feature triggers the first paid bill.
10. Second-system import — export your test data and successfully load it somewhere else.

For an agency, I'd rank them: Bitrix24 if maximum free capacity matters, HubSpot if usability/ecosystem matters, Zoho if you want to test serious CRM functionality with a small team, and ClickUp if CRM + client delivery should live together.

One important distinction: “free forever” doesn't mean “migration-safe forever.” Before moving actual client lists, I'd make successful export/import part of your acceptance criteria—particularly with Bitrix24. interobservers.combitsfrombytes.com

If you’re an agency evaluating a platform before moving client lists, I’d prioritize tools that let you:

• create a sandbox account without payment,
• import a sample/client list safely,
• test segmentation, automations, reporting, integrations, and permissions,
• export your data if it doesn’t fit.

The best “free forever” candidates depend on what you’re migrating from/to (CRM, email marketing, marketing automation, client portal, etc.), but these are strong testing options:

My shortlist for an agency migration test

If you manage client marketing/email lists

1. Brevo — easiest “import a copy of a list and see if workflows fit” test.
2. GetResponse — better if you need funnels, landing pages, and automation evaluation. GetResponse
3. Mautic/self-hosted options — best if avoiding per-contact pricing matters.

If you’re replacing a CRM

1. HubSpot Free CRM — good for proving adoption with a few clients before committing.
2. Capsule CRM — simpler pilot environment with fewer moving parts. Capsule CRM

Agency migration approach I’d use

1. Export one small client list (e.g., 500–2,000 contacts, depending on size).
2. Import into the free account.
3. Recreate: - 2–3 segments,
4. one nurture sequence,
5. one campaign,
6. one reporting dashboard,
7. one integration.
8. Test: - unsubscribe handling,
9. duplicate detection,
10. tags/custom fields,
11. team permissions,
12. client approval workflow.
13. Only then migrate the full database.

A key agency concern: avoid migrating your entire client database into a platform that charges by contacts before you’ve validated the workflow. Some tools are “free” for testing but become expensive once multiple client lists are active. GetResponse

If you tell me what you’re migrating from (Mailchimp, HubSpot, ActiveCampaign, GoHighLevel, Salesforce, etc.) and whether you need white-label/client workspaces, I can narrow this to the best 3–5 options.

If you’re evaluating CRM/client-management platforms for an agency, I’d prioritize free-forever tiers where you can actually import a representative client dataset and exercise the workflows—not just a 14-day trial.

My shortlist for an agency

1. HubSpot — start here.
HubSpot currently advertises a no-cost CRM with core CRM functionality and no expiration. Its official pages describe contact/deal/task management, email tracking, meeting scheduling and other useful testing capabilities. HubSpot HubSpot

One caveat: HubSpot's own pages currently give inconsistent free-tier limits—some say up to 1 million contacts/unlimited users, while its pricing page says the free tools are for up to 2 users and another FAQ says 1,000 contacts. HubSpot HubSpot I'd therefore verify the limits displayed for your account before loading a large client list.

hubspot.com

2. Zoho CRM — best second test.
It's particularly useful if you want to compare a more conventional CRM architecture against HubSpot. Current 2026 comparisons put its free tier at up to 3 users and around 5,000 records, with leads, contacts, accounts and deals. Dupple Sasanova

zoho.com

3. Bitrix24 — test if your agency needs collaboration too.
Its official site currently describes the free CRM as $0 forever, with unlimited contacts, deal pipelines, email campaigns and team communication, and specifically supports CSV import with field mapping and deduplication. Bitrix24

bitrix24.com

How I'd run the evaluation

Don't migrate the real client database yet. Create a synthetic/test copy containing ~100–500 representative records and test:

• CSV import + field mapping
• Duplicate detection
• Custom fields
• Companies/accounts vs. individual contacts
• Multiple pipelines/client types
• User permissions
• Email/calendar integration
• Tasks and follow-ups
• Automation triggers
• Reporting
• Exporting the data back out
• API/integration availability
• What happens when you hit the free-tier ceiling

The export test is especially important for an agency: a platform that makes importing easy but makes clean data extraction difficult can create a painful future migration.

If you're choosing between HubSpot, Zoho, Bitrix24, and another specific platform, I can also give you an agency-focused migration test matrix showing exactly what to test before entrusting it with client lists.

hubspot.com

2. Zoho CRM — best second test.
It's particularly useful if you want to compare a more conventional CRM architecture against HubSpot. Current 2026 comparisons put its free tier at up to 3 users and around 5,000 records, with leads, contacts, accounts and deals. Dupple Sasanova

zoho.com

3. Bitrix24 — test if your agency needs collaboration too.
Its official site currently describes the free CRM as $0 forever, with unlimited contacts, deal pipelines, email campaigns and team communication, and specifically supports CSV import with field mapping and deduplication. bitrix24.com

If you mean CRM/client-management platforms with a genuinely free-forever tier—so an agency can build a sandbox, import a representative client list, and test workflows before committing—these are the ones I’d shortlist in 2026:

HubSpot is particularly attractive for an agency doing a low-risk migration pilot: its current materials advertise a free tier, no credit card requirement, and up to 1 million contacts, although HubSpot's pricing/help pages have some inconsistencies about the exact free-user/contact limits, so I'd verify the limits in the account you're creating before loading a production list. www.hubspot.com

Zoho is probably the better structured CRM test if you want to evaluate actual sales processes rather than just contact storage. Its official pricing page explicitly says the CRM Free Edition is free forever for three users and includes contact management, deals, workflows, reports, and mobile access. www.zoho.com

Brevo is worth considering if the migration is primarily contacts + email marketing rather than sales-pipeline management. Its free plan is explicitly not time-limited and permits 100,000 stored contacts, but caps sending at 300 emails/day and automation entry at 2,000 contacts. help.brevo.com

What I'd do as an agency

Don't import an entire client list initially. Use a representative pilot dataset—e.g. 100–500 records containing the different fields, tags, lifecycle stages, custom fields, and edge cases your clients actually use.

Then test:

1. CSV import/export fidelity — especially custom fields, dates, tags and duplicates.
2. Client segmentation — can you recreate the lists clients rely on?
3. Pipeline/workflows — can you reproduce the actual operating process?
4. Email/calendar integrations — particularly important if the agency manages accounts for multiple clients.
5. Permissions — can you prevent one client's data from being visible to another?
6. Data portability — export the test data back out and see whether you'd actually be able to leave.
7. Paid-plan cliff — identify exactly which feature forces you to upgrade.

My starting order: HubSpot → Zoho CRM → Bitrix24 → Brevo, unless email marketing is the core requirement, in which case I'd move Brevo near the top.

If you tell me what type of agency you are (marketing, recruiting, real estate, insurance, etc.) and roughly how many contacts/users per client, I can narrow this to 2–3 platforms and compare the specific free-tier limits that would affect a migration.

If you’re an agency evaluating platforms before moving real client data, I’d prioritize free tiers that are genuinely permanent and let you exercise the core workflow—not just a 14/30-day trial.

What I'd do as an agency

1. Start with HubSpot if the migration is primarily a client/contact CRM. Its free plan specifically includes CRM import, contact management, deal pipelines and reporting, and there's no expiration date. www.hubspot.com

2. Test Bitrix24 if you need the CRM to coexist with tasks, projects and internal agency collaboration. Its free plan includes those core functions, and Bitrix24 says the free plan remains available indefinitely. www.bitrix24.com

3. Test Project.co or Worklenz if what you're really migrating is an agency operating system—clients → projects → tasks → time/budget → delivery—rather than merely a contact database. Project.co's free limits are particularly easy to use for a controlled pilot. www.worklenz.comwww.project.co

One important caveat

"Free forever" doesn't necessarily mean free access to all the features you ultimately care about. For an agency, I'd test these before importing a full client list:

• CSV/contact import and field mapping
• Custom fields
• Duplicate handling
• Multiple clients/organizations
• User permissions and client visibility
• Automations/workflows
• Email/calendar integrations
• Exporting all your data back out
• API/integration availability
• Branding/white-label restrictions
• Limits on contacts, projects, storage and users

Safest migration strategy: create a sandbox with perhaps 25–100 representative client records, including messy names, custom fields, multiple contacts per company, notes, tags and a few active projects. Run the complete workflow, export it, and verify that you can reconstruct the data before touching the production client list.

If you tell me what type of agency you are and what platform you're migrating away from (e.g. Dubsado, HoneyBook, GoHighLevel, Salesforce, Monday, Airtable), I can narrow this to the 3 best free-forever candidates and compare their migration limits/features side by side.

If by “platforms” you mean CRM/client-management platforms where an agency can build a realistic pilot before moving client lists, I’d shortlist these:

My agency-oriented ranking

1. Bitrix24 — best for testing with a realistic-sized client list.
The unlimited-contact free tier is a major advantage if you want to import a representative slice—or potentially the whole list—without immediately hitting a contact ceiling. It also lets you test CRM, tasks, calendars and collaboration in the same environment. helpdesk.bitrix24.com

2. HubSpot — best for evaluating the polished client experience.
I'd use this if you're primarily assessing CRM usability, pipelines, contact records, email tracking, reporting and integrations. The downside for an agency is the 1,000-contact/2-user free limits. www.hubspot.comwww.hubspot.com

3. Zoho — best middle ground for traditional CRM functionality.
Its free edition gives you the core objects you'd want to test—leads, contacts, deals, tasks and events—and you can separately trial paid editions for 15 days. help.zoho.comhelp.zoho.com

One important distinction

For an agency, I'd not migrate an entire client list first. Create a pilot with perhaps 50–200 representative records containing different edge cases: companies vs. individuals, duplicates, custom fields, multiple contacts per company, inactive clients, etc. Test:

• CSV import/export and field mapping
• deduplication
• custom fields
• permissions/roles
• automations
• email/calendar integrations
• reporting
• API/integration capabilities
• how easily the data can be exported again

Then have the agency team actually work the pilot for a couple of weeks before committing to the full migration.

If you tell me what you're migrating from (e.g., Salesforce, Airtable, spreadsheets, another CRM), approximate number of client records, and how many agency users, I can narrow this to the 2–3 best free options and identify exactly where each free tier will bite you.

If you’re an agency evaluating CRM/client-management platforms before moving real client data, I’d prioritize tools with a permanent free tier, CSV import/export, enough records to run a realistic pilot, and a usable upgrade path.

Best free-forever options

Current 2026 comparisons consistently identify HubSpot, Zoho, Freshsales and Bitrix24 as genuine no-expiration free options, although published limits differ as vendors change their plans. www.stackfyi.com

For an agency, I'd test them in this order

1. HubSpot — Start here if you want to see whether a mainstream CRM can handle your client lifecycle without immediately paying. Test importing a representative client list, multiple contacts per company, deal stages, custom properties, email history, and your integrations.

2. Zoho CRM — Test this alongside HubSpot if your agency needs more traditional CRM structure and workflow customization. Its free plan is commonly reported at 3 users and up to 5,000 records, making it practical for a controlled pilot. bitsfrombytes.cominterobservers.com

3. Freshsales — Particularly worth testing if your account managers/salespeople rely heavily on email and calling. Its free tier is aimed at small teams and provides a visual pipeline. www.stackfyi.comfreestackfinder.com

4. Bitrix24 — Worth a separate pilot if you're trying to replace several systems with one platform—CRM, tasks, projects, chat, etc. But I would not load your authoritative client database until you've verified the exit/export process. Some current comparisons specifically flag CSV-export restrictions on its free tier. bitsfrombytes.cominterobservers.com

One important agency rule

Don't start by importing the entire client list.

Take 50–200 representative records and run the same migration test through each platform:

• Contacts + companies
• Multiple contacts attached to one client
• Custom fields
• Tags/lists
• Deal/opportunity history
• Notes and activities
• Duplicate handling
• CSV import
• CSV export back out
• User permissions
• API/integrations
• Automation
• Reporting
• Deleting a client and restoring/re-importing it

The export test is especially important. A platform being free forever isn't useful if leaving it requires a paid upgrade or loses critical relationship/activity data. Free CRM comparisons specifically flag export and lock-in as an often-overlooked consideration. bitsfrombytes.cominterobservers.com

My short list for an agency pilot: HubSpot + Zoho + Freshsales, with Bitrix24 added if you specifically want CRM + project management in one system.

If you tell me roughly how many clients/contacts you have and how many agency users need access, I can narrow that to the 2–3 platforms whose free tiers actually accommodate your migration test.

Yes. If you’re an agency trying to prove out a platform with real-ish client data before committing to a migration, I’d separate “free forever” from “free trial.” The former is much better for a cautious migration because you can keep the sandbox running indefinitely.

Strong free-forever candidates

Current 2026 comparisons confirm that HubSpot, Zoho, Freshsales, Attio and Bigin have genuine forever-free CRM tiers, while Bitrix24 is notable for unlimited free users. yourcrmfinder.cominterobservers.com For agency project management, ClickUp, Worklenz, Asana and others maintain permanent free tiers, although their limits differ substantially. clickup.com

For email/contact-list migration specifically, Brevo is particularly interesting because its free plan allows unlimited contacts, while MailerLite gives a more constrained subscriber allowance but substantially more monthly sending capacity. www.stackfyi.com

What I'd test before touching the real client lists

Don't just create an account and click around. Take a sanitized sample of 100–500 records and test:

1. CSV import — custom fields, tags, duplicates, dates, owners.
2. Segmentation — can you reproduce your existing client/list structure?
3. Automations — test the workflows that would actually matter after migration.
4. Exports — verify you can get your data back cleanly. This is especially important because some free tiers restrict exporting. yourcrmfinder.cominterobservers.com
5. Permissions — agency staff vs. client access.
6. Integrations/API — make sure your existing stack can connect without requiring a paid tier.
7. Upgrade boundary — deliberately hit the limits so you know exactly what will force the agency onto a paid plan.
8. Client isolation — ideally determine whether each client's data can be separated cleanly without creating an administrative nightmare.

My shortlist would be:

• CRM/client database: HubSpot or Zoho
• All-in-one agency operations: Bitrix24
• Project/client delivery: ClickUp or Worklenz
• Large marketing lists: Brevo
• Email-focused migration: MailerLite

The important distinction is that “free forever” doesn't mean “all features are free forever.” For an agency, the most dangerous migration surprise is discovering after importing hundreds of client records that a critical export, automation, permission, or integration capability sits behind the paid tier.

If you’re an agency evaluating platforms before moving client lists, I’d focus on genuinely free-forever tiers—not 14-day trials—and test with a small representative client list first.

My agency shortlist

1. Zoho CRM — probably the best CRM migration sandbox.
5,000 records gives you enough room to import a meaningful sample, map custom fields, build pipelines, test permissions, and see how your agency's process actually feels. Current comparisons put its free tier at 3 users/5,000 records. www.hubspot.comwww.featurebase.app

2. Brevo — best if your clients' lists are primarily marketing/email lists rather than sales CRM data. Its unusual advantage is that you can store up to 100,000 contacts for free, although sending and automation are heavily restricted. help.brevo.com

3. HubSpot — best for testing UX and ecosystem/integrations, but I wouldn't use it as the primary large-list migration sandbox. New free accounts are limited to 1,000 contacts and 2 users. www.hubspot.com

4. Bitrix24 — worth testing if the agency wants CRM plus projects/tasks/team collaboration under one roof. The tradeoff is considerably more complexity than Zoho or HubSpot.

One important distinction

If by "client lists" you mean thousands or tens of thousands of marketing subscribers, I'd test Brevo first. If you mean customer/company records with sales pipelines, custom fields, activities and ownership, I'd start with Zoho CRM.

For an agency, I'd also test CSV import/export, deduplication, custom-field mapping, API access, user permissions, and data portability before migrating anything valuable. A platform being free forever isn't very useful if getting your clients' data back is painful.

If you tell me roughly how many contacts per client and whether you need CRM, email marketing, or both, I can narrow this to the 2–3 platforms that make the most sense.

If you’re evaluating CRM platforms as an agency, I’d prioritize genuinely free-forever tiers where you can import a sample client list, build pipelines, test permissions/automation, and see the workflow before committing to migration.

Current 2026 comparisons also identify HubSpot, Zoho, Bitrix24, Freshsales and Brevo among the stronger genuinely free CRM options rather than merely 14-day trials. dupple.com

For an agency, I'd test in this order

1. HubSpot — best first pilot if you want to demonstrate the platform to multiple clients. The ecosystem and interface make it relatively easy to show stakeholders what a migrated environment would look like.

2. Zoho — best second pilot if you want to see whether a more CRM-centric system gives you better control over fields, roles, workflows and sales processes. Its free edition explicitly supports 5,000 records and three users. www.zoho.com

3. Bitrix24 — worth testing if you're trying to consolidate CRM + tasks + internal collaboration rather than simply replace a contact database. Its official free tier specifically supports CSV contact/deal imports. www.bitrix24.com

One important agency precaution

Don't upload an entire client's production list just to test. Create a representative sandbox dataset—say 100–500 contacts containing the same fields, duplicates, tags, companies, deals, custom fields and edge cases as the real client data.

Then test:

• CSV import and field mapping
• deduplication
• custom fields
• multiple pipelines
• user roles/permissions
• email/calendar integration
• automation
• exports/backups
• API/integration availability
• what happens when you hit the free-tier ceiling

For an agency, exportability is especially important: a platform can be “free forever” yet still be painful to leave. I’d make successful import → configure → export → re-import a required proof-of-concept before recommending anything to a client.

If by “client lists” you mean CRM/contact databases, there are several genuinely free-forever options worth testing before you risk a migration.

A few important distinctions:

• For migrating a large client database: I'd test HubSpot and Brevo first. Brevo explicitly allows up to 100,000 stored contacts on its free tier, although sending is limited. help.brevo.com
• For a full agency CRM: Bitrix24 is unusually generous: its free CRM advertises unlimited contacts and users, plus pipelines, forms, tasks and basic automation. www.bitrix24.comwww.mailerlite.com
• For a conventional CRM evaluation: Zoho CRM is a good controlled test because its free tier gives you real leads, contacts, accounts and deals rather than just a contact list. www.salesforce.com
• Don't use MailerLite as your large-list migration sandbox. Its free limit is now only 250 active subscribers, so it's better for testing the product than testing your actual client database. www.mailerlite.com

What I'd do as an agency

Before importing any real client data, create a 50–100-record synthetic dataset and test:

1. CSV import/export and field mapping
2. Custom fields/tags
3. Duplicate detection
4. Multiple users and permissions
5. Pipeline/client segmentation
6. Automations and workflows
7. Email integration
8. API/integrations
9. Exporting everything back out

That last test is particularly important: a platform can be “free forever” and still create painful lock-in.

My shortlist: HubSpot → Bitrix24 → Zoho CRM for CRM/client management; Brevo → MailerLite if the primary job is email marketing.

If you’re an agency evaluating CRM/client-management platforms, the safest approach is to create a sandbox account, import a small test batch (e.g., 50–200 contacts), and validate workflows before migrating the full client list. Several platforms have free-forever tiers that let you do this without starting a paid trial. yourcrmfinder.com

For an agency migration evaluation, I’d test in this order:

1. HubSpot Free — best first benchmark because it gives you a mature CRM environment with room to grow. bestcrmforstartups.com
2. Zoho CRM Free — good if your agency needs custom objects/fields and a more configurable CRM. www.sasanova.com
3. Bitrix24 Free — worth testing if your client delivery process includes tasks/projects, not just sales tracking. bestcrmforstartups.com

Before importing real client data, I’d check:

• Can you export everything back out (contacts, notes, activities, attachments)?
• Can you recreate your current client lifecycle stages?
• Can multiple account managers access the same records cleanly?
• Are email sync, permissions, and integrations available on the free tier?
• Does the paid upgrade path match your likely needs?

A practical pilot is usually:

• 25–100 sample contacts
• 1–2 client pipelines
• your actual custom fields
• one complete client journey from lead → signed client → renewal

That will reveal migration issues without putting your full client database at risk.

If you mean CRM/marketing platforms where an agency can import a client’s list, actually test the workflow, and stay at $0 indefinitely, there are several credible options in 2026—not just time-limited trials. www.stackfyi.com

HubSpot, Zoho, Freshsales and Bitrix24 are consistently identified as genuine free-forever CRM options rather than disguised trials. www.stackfyi.com Bitrix24 explicitly supports CSV contact/deal imports on its free plan. www.bitrix24.com

For an agency, I'd test in this order

1. HubSpot — best general-purpose migration sandbox.
Useful if you want to reproduce a client's contacts, pipeline, forms and basic marketing process before deciding whether the paid ecosystem is worth it.

2. Zoho CRM — best if you're evaluating a more traditional CRM.
The 5,000-record/3-user free tier gives you enough room for a meaningful pilot without immediately paying. interobservers.com

3. Brevo — particularly compelling if "client lists" means email subscriber lists rather than sales CRM records. Its free tier stores up to 100,000 contacts, although sending is capped at 300 emails/day and automation at 2,000 contacts. help.brevo.com

4. Bitrix24 — worth testing when the client needs CRM plus project/task collaboration. Its free plan supports unlimited contacts and CSV imports, though its broader interface is considerably more involved. www.bitrix24.com

One agency-specific caution

Don't migrate an entire client's production list on day one. I'd first import a sanitized/test subset and verify:

• field mapping and custom fields
• duplicate handling
• tags/lists/segments
• unsubscribe/consent data
• automation triggers
• exports/backups
• user permissions
• API/integration requirements
• exactly which features become paywalled at the client's expected scale

If you tell me whether you're evaluating CRMs, email marketing platforms, or both, and roughly how large your typical client lists are (e.g. 5k, 50k, 500k), I can narrow this to the platforms that are genuinely viable for an agency migration.

If you’re an agency testing platforms before moving real client lists, I’d focus on free-forever tiers that let you import contacts, build workflows, test segmentation, and evaluate the client experience without starting a paid trial.

My agency shortlist

1. HubSpot — start here if you're evaluating a CRM.
Its free tier is unusually useful for testing a client migration because you can experiment with a substantial contact database without immediately paying per seat. Current 2026 comparisons put the free tier at up to roughly 1 million contact records, with unlimited users, although important automation capabilities sit behind paid tiers. dupple.com

2. Zoho — test this if you want a "real CRM" without the marketing ecosystem.
The free tier is designed for up to 3 users and gives you actual CRM functionality rather than merely a contact database. That's particularly useful if your agency wants to recreate a client's sales pipeline before migration. interobservers.com

3. Bitrix24 — worth testing if clients need CRM + operations.
Its free plan includes CRM, tasks and collaboration, and Bitrix24 explicitly supports importing contacts/deals from CSV. It advertises the free CRM as having unlimited contacts and being free indefinitely. helpdesk.bitrix24.com

4. Brevo — particularly attractive if the "client list" is primarily an email database.
The free plan is genuinely perpetual, supports up to 100,000 stored contacts, and includes email/SMS campaigns, segmentation and automation. The important constraint is 300 email sends/day and only 2,000 unique contacts entering active automations. help.brevo.com

5. MailerLite — great if the migration is really about email marketing rather than CRM.
Its free tier includes email automation, landing pages, forms and A/B testing, and doesn't expire. The current free plan permits 2,500 emails/month, but its subscriber allowance is much tighter, so I'd use it with a representative test list rather than blindly importing a huge client database. www.mailerlite.com

The agency-safe way I'd test

Don't immediately upload the client's entire list. Create a synthetic 100–500-record dataset containing:

• duplicates
• missing emails
• multiple tags/lists
• custom fields
• companies + contacts
• unsubscribed contacts
• a few sample deals
• different lifecycle stages

Then test CSV import → field mapping → deduplication → segmentation → automation → export.

The last step is especially important: a platform can look fantastic until you discover that getting your client's data back out is awkward or restricted. For an agency, portability should be a migration requirement, not an afterthought.

If I were narrowing this to three: HubSpot for general CRM, Zoho for CRM-heavy clients, and Brevo for email-list-heavy clients.

If you're an agency evaluating CRM/client-management platforms before moving real client lists, I’d focus on platforms with a genuinely permanent free tier, import/export capability, and enough functionality to test the workflows you’ll eventually sell to clients.

Current 2026 comparisons consistently identify HubSpot, Zoho, Freshsales and Bitrix24 as legitimate free-forever options rather than expiring trials. interobservers.com

My agency shortlist

1. HubSpot — safest first pilot.
I'd start here if your agency wants to put a representative sample of client records into a system and test the complete experience. The free CRM has unusually generous contact capacity and doesn't force you into a paid subscription just to keep the database alive. www.sasanova.com

2. Zoho CRM — best for testing a more configurable CRM.
Its free tier is smaller—up to three users and roughly 5,000 records in current comparisons—but it gives you a useful environment for testing fields, leads, deals and basic workflow automation. interobservers.comwww.sasanova.com

3. Bitrix24 — best if you're evaluating an all-in-one agency platform.
It's unusually broad: CRM, tasks/projects, communication and document collaboration can coexist in the free environment. The tradeoff is considerably more complexity, so I'd pilot it with a small client rather than migrating everyone immediately. Bitrix24 itself currently advertises its free CRM as $0 forever with unlimited contacts. www.bitrix24.com

4. Freshsales — worth testing for sales-heavy clients.
Particularly interesting if the client workflow revolves around calls, email and sales follow-up rather than extensive project management. Current comparisons put its free tier at three users with unlimited contacts. www.sasanova.com

One important agency rule

Don't test with an entire client list first. Import a sanitized 100–500-record sample and deliberately test:

• CSV import and field mapping
• duplicate detection
• custom fields/tags
• multiple contacts per company
• pipeline stages
• email/calendar integrations
• permissions between agency staff and clients
• automation/workflows
• API/integration requirements
• full data export back to CSV

That last one matters more than it sounds. Free-plan restrictions around exporting data can create vendor lock-in; current comparisons specifically flag this as something to investigate with Bitrix24. interobservers.com

If I were running the agency evaluation, I'd pilot HubSpot + Zoho + Bitrix24 side-by-side, using the exact same 100-record dataset and the same five workflows. That will tell you much more than feature-list comparisons.

If you tell me what kind of agency you are (marketing, staffing, real estate, web/dev, etc.) and roughly how many client contacts you manage, I can narrow this to 3–5 platforms and compare the free-tier limits, imports, automation, permissions, integrations, and migration risk specifically for your use case.