ChatGPT answers, unedited

If you’re a freelance marketer managing separate client lists, I’d pick mailerlite.com among the free options I checked.

• MailerLite: Free plan supports unlimited audiences, so you can keep Client A, Client B, Client C, etc. separated within the platform. The current free tier allows up to 250 active subscribers and 2,500 emails/month. MailerLite MailerLite
• Brevo: Also useful if your lists are larger. Its free plan allows up to 100,000 stored contacts and 300 emails/day, and you can organize contacts into multiple lists. Brevo Help Brevo Help
• For true client separation: MailerLite has a particularly nice agency setup: you can manage separate client accounts, with each account retaining its own subscribers, campaigns, templates, and billing. MailerLite

My recommendation

Use MailerLite if you have several small clients and want clean separation. Its unlimited-audience structure is much more convenient than trying to cram everyone into one master list.

Use Brevo if contact volume is your main concern—100,000 stored contacts on the free plan is dramatically more generous. Brevo Help

If by “projects” you mean separate workspaces/accounts where each client gets completely isolated contacts, branding, and reporting, rather than merely separate audiences, I can compare the free tiers of MailerLite, Brevo, Kit, HubSpot, and Sender specifically for freelance/agency use.

Yes. For a freelance marketer managing multiple client lists, I’d look first at MailerLite.

Best fit: MailerLite

• Free tier: up to 250 active subscribers and 2,500 emails/month. www.mailerlite.comwww.mailerlite.com
• Unlimited audiences: the Free plan explicitly supports unlimited audiences, so you can keep different client/list audiences separate. www.mailerlite.comwww.mailerlite.com
• Multiple accounts: MailerLite lets agencies/freelancers create separate accounts for different clients and switch between them. Each account keeps its own subscribers, campaigns, forms, and billing. www.mailerlite.comwww.mailerlite.com
• You can also use groups/segments within an account if the clients don't need completely separate accounts. www.mailerlite.com

Another option: Brevo

Brevo's Free plan is more generous on contacts—up to 100,000 stored contacts—and allows up to 300 contact lists. However, you're limited to 300 email sends/day and one user. help.brevo.com

My pick for a freelancer: MailerLite if the priority is cleanly separating small client accounts and keeping the workflow simple. Brevo is better if your clients have much larger databases and the 300-email/day limit isn't a problem.

If by "projects" you mean separate clients with completely isolated logins, branding, contact lists, and campaigns, MailerLite is particularly well suited to that setup. www.mailerlite.comwww.mailerlite.com

If you mean email marketing platforms where you can keep different clients’ audiences separated, MailerLite is probably the best free-tier fit right now.

MailerLite explicitly includes unlimited audiences on its $0 plan, along with unlimited segments/groups. The catch is the relatively small 250 active-subscriber limit. MailerLite MailerLite

Brevo is the other strong choice. Its free plan allows up to 100,000 stored contacts and up to 300 contact lists and 300 folders, so you could organize clients as separate folders/lists within one account. The main limitation is 300 email sends per day. Brevo Help Brevo Help Brevo Help

I would avoid Mailchimp for this particular use case: its current Free plan includes only one audience, which makes it awkward for managing independent client databases. Mailchimp

My pick:

• MailerLite → best if each client has a small list and you want genuinely separate audiences.
• Brevo → best if you manage larger lists and can work within the daily sending limit.
• If you need completely isolated client accounts, branding, billing, and logins, that's a different requirement; I'd look at platforms with multiple workspaces/accounts rather than just multiple audiences.

Brevo is the other strong choice. Its free plan allows up to 100,000 stored contacts and up to 300 contact lists and 300 folders, so you could organize clients as separate folders/lists within one account. The main limitation is 300 email sends per day. Brevo Help Brevo Help Brevo Help

I would avoid Mailchimp for this particular use case: its current Free plan includes only one audience, which makes it awkward for managing independent client databases.

My pick:

For a freelance marketer managing multiple client lists, I’d look first at MailerLite.

Best free-tier options

Why I’d pick MailerLite: its current Free plan explicitly includes unlimited audiences, so you can keep Client A, Client B, Client C, etc. separated within one account. It also allows subscribers to exist in multiple groups without counting them twice toward the 250-subscriber limit. www.mailerlite.comwww.mailerlite.com

One important caveat: 250 active subscribers is the total account limit, not 250 per client/audience. So it's excellent if you're managing several small client lists, but you'll hit the ceiling quickly if each client has hundreds of contacts. www.mailerlite.comwww.mailerlite.com

Brevo is potentially better if your clients have larger databases: its free tier allows up to 100,000 stored contacts and up to 300 contact lists, although sending is limited to 300 emails/day. help.brevo.com

My recommendation:

• Several small clients → MailerLite
• Large client databases / lots of contacts → Brevo
• Want truly separate client accounts rather than just separate lists → I'd compare multi-account/workspace options before choosing.

If you tell me roughly how many clients and contacts per client you manage, I can narrow it down to the best free setup.

If you mean email marketing, and you’re managing multiple clients with separate lists/audiences, I’d look at these first:

My pick: MailerLite

For a freelancer, MailerLite is probably the cleanest fit because it explicitly supports agencies managing separate client accounts from one login. Each account keeps its own subscribers, campaigns, templates, and billing separate. www.mailerlite.com

The downside is the current free plan is relatively small—250 active subscribers per account—and the free-plan limits were updated in June 2026. www.mailerlite.com

If client list size matters more: Brevo

Brevo is more attractive if you're managing larger lists. Its free plan allows up to 100,000 contacts and 300 email sends per day, with contacts organized into lists/segments. help.brevo.com

The catch: it's more of a single-account/list-separation model than MailerLite's clean “one client = one account” setup.

So, for a freelance marketer:

• Clean client separation → MailerLite
• Large combined contact volume → Brevo
• Generous sending + automation → Sender
• Newsletter/creator clients → Kit

If by “separate audiences or projects” you mean multiple completely independent client workspaces under one free login, rather than simply multiple lists, MailerLite is the standout choice.

If you mean email marketing platforms where you can keep different client lists/audiences separated, MailerLite is probably the best fit on the free tier.

My pick: MailerLite

MailerLite explicitly includes unlimited audiences on its free plan, so you can keep Client A, Client B, Client C, etc. organized as separate audiences rather than mixing everyone into one list. It also supports unlimited dynamic segments and interest groups/tags. www.mailerlite.com

The catch is that as of June 2026, its free tier is only 250 active subscribers and 2,500 monthly emails, so it's excellent for small client accounts but you'll hit the ceiling quickly if you're managing several sizable lists. www.mailerlite.com

MailerLite pricing

One important distinction: if by “separate projects” you mean completely separate client accounts with their own subscribers, campaigns, billing, etc., MailerLite's agency offering is even more relevant—it supports switching between separate client accounts from one login. www.mailerlite.com

If you tell me roughly how many clients and subscribers per client you manage, I can recommend the cheapest setup (including whether you should use one account with separate audiences or separate accounts).

If you’re a freelance marketer managing multiple clients, I’d look at Brevo first.

My pick: Brevo

Brevo lets you create folders for different brands/clients and separate contact lists within them. Its current free plan supports up to 100,000 stored contacts, although you're limited to 300 email sends per day and one user. help.brevo.com

For example:

• Client A → Folder → Newsletter / Leads / Customers
• Client B → Folder → Newsletter / Leads / Customers
• Client C → Folder → Newsletter / Leads / Customers

That makes it much cleaner than trying to force several clients into one audience.

Brevo

One caveat: if by “separate projects” you mean completely isolated client workspaces/accounts with separate branding, logins, billing, and reporting, that's a different requirement. In that case, I can compare the best free/cheap agency-friendly platforms specifically for freelancers.

If you’re a freelance marketer managing multiple client lists, you’ll want more than a simple “one newsletter list” tool. Look for multiple audiences, groups, workspaces, brands, or client separation on the free tier.

Here are some good options:

My shortlist for a freelance marketer:

1. MailerLite — best overall starting point
   • Easy for clients to understand
   • Good templates, automations, landing pages
   • You can keep client lists separated with groups/segments www.mailerlite.com

2. SendDock — best if “separate client spaces” matters most
   • More like managing separate projects/workspaces rather than one giant database senddock.devwww.zoho.com

3. Zoho Campaigns — best if you expect to manage many clients professionally
   • More agency-oriented workflows www.zoho.com

One thing to watch: many platforms advertise “multiple audiences,” but that can mean segments inside one account, not truly separated client environments. If you need to hand a client access without exposing other clients’ data, prioritize workspaces, subaccounts, or client permissions. senddock.devwww.zoho.com

If you’re mainly doing email marketing for clients, I’d lean MailerLite or Zoho; if you’re managing 10+ brands with separate logins/permissions, look for an agency platform.

For a freelance marketer managing multiple client lists, the key feature is usually not just “free contacts,” but whether you can keep clients/audiences separated without mixing data. Here are the strongest free-tier options:

My recommendation for a freelance marketer

• Best free choice for multiple clients: Brevo — you can keep different client lists separated with contact attributes, lists, and segments, and the large contact allowance is useful. help.brevo.com
• Best if you manage newsletters/content creators: Kit. freestack.tools
• Avoid using one free Mailchimp account for multiple clients — the single-audience limitation makes client separation awkward. mailchimp.com

One caveat: if you need true agency-style separation (each client gets their own login, billing, branding, and isolated workspace), most platforms reserve that for paid agency plans or require creating separate accounts. For client work, many freelancers either:

1. create a separate account per client (cleanest), or
2. use one master account with strict tags/lists and naming conventions (cheapest).

Yes. For a freelance marketer managing separate client lists, MailerLite is probably the best fit on the free tier.

My pick: MailerLite

MailerLite's current Free plan explicitly includes unlimited audiences, plus up to 250 active subscribers, 2,500 emails/month, and 2 users. That makes it unusually useful if you want something like:

• Client A → Audience A
• Client B → Audience B
• Client C → Audience C

You can also put subscribers into multiple groups without them being counted multiple times toward the subscriber limit. www.mailerlite.com

The catch: 250 active subscribers is the main limitation. So it's excellent for small client lists, but you'll hit the ceiling quickly if you're managing several larger accounts.

Brevo is worth considering

Brevo gives you a much larger free contact allowance—up to 100,000 stored contacts—and allows up to 300 contact lists. The free plan is limited to 300 email sends per day, though. help.brevo.com

So if your priority is many separate client lists rather than a small subscriber count, I'd actually lean Brevo.

Bottom line:

• Small lists + clean audience separation: MailerLite
• Many/larger client lists: Brevo
• Creator/newsletter-focused work: Kit

If by "separate projects" you mean completely isolated client accounts/workspaces with separate logins and branding, that's a different requirement—and I can narrow it down to platforms that actually support that on free plans.

If you mean email marketing platforms where you can keep different clients/audiences separated, Brevo is probably the best free-tier fit right now.

Brevo explicitly allows up to 300 contact lists on its Free plan, so you could organize things like Client A, Client B, Client C, etc., within one account. The free tier also allows up to 100,000 stored contacts, although you're limited to 300 email sends per day. help.brevo.com

Mailchimp is less suitable for this particular use case: its current free plan permits just one audience and 250 contacts. mailchimp.com

Kit is also less ideal for distinct clients because it is fundamentally subscriber-centric with one list; its own documentation recommends separate accounts for businesses with genuinely distinct audiences. help.kit.com

My pick for a freelance marketer

Brevo → best free option if you want one login/dashboard and separate client lists.

One caveat: if by “separate projects” you mean each client needs a completely isolated workspace—with their own login, branding, sending domain, analytics, etc.—then I'd look at client/workspace-oriented platforms rather than merely multiple lists. Brevo's free plan has only one user seat. help.brevo.com

If you tell me how many clients/lists you typically manage and roughly how many contacts per client, I can narrow it down to the best 2–3 options.

If you mean email marketing platforms where you can keep different clients’ audiences separate, I’d look first at Brevo.

Best fit: Brevo

Brevo has a $0/month free tier with up to 100,000 stored contacts and 300 email sends/day. More importantly for a freelancer, you can create multiple contact lists and segments and choose which lists receive each campaign. help.brevo.com

That makes it workable for something like:

• Client A → List A
• Client B → List B
• Client C → List C
• Your own newsletter → List D

The big caveat: Brevo Free only allows one user/account owner, so it's better if you manage everything rather than giving each client their own login. help.brevo.comdownloads.mailchimp.com

Other options

One important distinction: if by “separate projects” you mean completely isolated client accounts/workspaces, rather than separate lists inside one account, the answer changes. For client work, isolated accounts are generally safer because client data, billing, sender identities, and permissions don't get mixed. Mailchimp itself has historically recommended separate accounts for different clients for this reason. downloads.mailchimp.com

My pick for a freelance marketer: Brevo if you want one free dashboard to manage multiple client audiences; separate accounts if clients need independent ownership/access.

Brevo

If you tell me roughly how many clients/lists you manage and how many subscribers each has, I can narrow it down to the best 2–3 free options.

If you mean email marketing platforms where you can keep different clients/audiences separated, MailerLite is probably the best fit.

Best options

MailerLite explicitly says its free plan includes unlimited audiences, which is unusually useful if you're separating Client A, Client B, Client C, etc. www.mailerlite.com

For a freelancer, I'd actually rank them:

1. MailerLite — best if each client has a relatively small list.
2. Brevo — best if your clients have larger databases; its free plan supports up to 100,000 contacts but caps sending at 300 emails/day. help.brevo.com
3. Kit — excellent if your clients are creators/newsletter businesses, less ideal for conventional client marketing.

One important distinction: if by "separate projects" you mean completely isolated client accounts—separate login/account, billing, subscriber database, campaigns, etc.—rather than merely separate audiences within one account, MailerLite is especially interesting because it supports switching between separate client accounts from one login. www.mailerlite.com

For a freelance marketer managing 5–10 clients, I'd lean MailerLite. MailerLite

For a freelance marketer managing multiple client lists, the key feature is not just a free email plan — it’s whether the platform lets you keep separate audiences, brands, workspaces, or projects without mixing clients together.

Good free (or free-to-start) options:

My pick by freelancer scenario:

• 3–10 small business clients: MailerLite — easiest setup and good enough separation using audiences/groups. www.mailerlite.com
• You need each client to feel like a separate account/workspace: Audienceful or an agency-focused tool like Tarvent. www.tarvent.comwww.audienceful.com
• Lots of contacts but fewer campaigns: Brevo can be cost-efficient because its free plan focuses on contact management and sending limits rather than charging immediately by list size. www.salesforce.comwww.audienceful.com

One thing to watch: many platforms let you create multiple segments, but that is not the same as having separate client workspaces. If you manage clients professionally, look for permissions, separate branding, separate sender domains, and the ability to prevent one client’s contacts from appearing in another client’s account. www.tarvent.comwww.audienceful.com

If you mean email marketing specifically (Mailchimp alternatives) or CRM/project management lists (HubSpot, Airtable, etc.), the best answer changes.