ChatGPT answers, unedited

For an agency managing multiple clients' email + SMS campaigns from one place, my top pick is HighLevel (GoHighLevel).

gohighlevel.com

Why I'd pick HighLevel

• One agency dashboard: Create separate client sub-accounts while managing them from your agency account. GoHighLevel HighLevel Support Portal
• Email + SMS: Run bulk campaigns, automated nurture sequences, two-way SMS, and email workflows. GoHighLevel GoHighLevel
• Automation: Build workflows with triggers, conditions, delays, email, SMS, calls, etc., then reuse them across clients. GoHighLevel
• Client separation: Each client gets their own contacts, campaigns, conversations, pipelines, and data rather than everything being mixed together. HighLevel Support Portal
• White-labeling: You can brand the platform with your agency's identity and offer clients a branded portal. GoHighLevel
• Reporting: You can monitor client campaign and pipeline performance without requiring a separate login for every account. GoHighLevel

How I'd compare the main options

*HubSpot's SMS capabilities depend on the specific setup/products.

HubSpot does have genuine multi-account management, including unified reporting and the ability to reuse emails, forms, lists, and workflows across accounts, but it's generally a more enterprise-oriented solution. HubSpot HubSpot Knowledge Base

Bottom line: If your agency's core service is lead generation + email/SMS follow-up + CRM + automation for multiple businesses, I'd start with HighLevel. It's particularly compelling if you eventually want to white-label the software and charge clients a monthly platform fee in addition to your marketing retainer. GoHighLevel

If you tell me how many clients you manage (e.g. 5, 20, 100+) and whether you want clients to log in themselves, I can narrow down the best platform and plan.

For an agency managing multiple clients’ email + SMS campaigns from one dashboard, my first choice is gohighlevel.com.

Why HighLevel fits agencies

• One agency login → separate client sub-accounts. Each client’s contacts, campaigns, pipelines, and conversations stay separated, while your team can switch between accounts. GoHighLevel
• Email + SMS in the same platform, including automated workflows, two-way messaging, follow-ups, and CRM activity. GoHighLevel
• Campaign templates/workflows can be duplicated across clients, which is particularly useful if you offer the same marketing package to many businesses.
• White-labeling: you can put your agency's branding, domain, and client-facing interface on the platform. HighLevel Support Portal GoHighLevel
• SaaS/reseller model: on the higher-tier setup, you can essentially turn the platform into your own branded marketing software and charge clients for access. HighLevel Support Portal

Other good options

ActiveCampaign now supports native email, SMS, WhatsApp and CRM in the same automation environment and has agency/partner functionality, so it's worth considering if campaign sophistication matters more than having an all-in-one agency operating system. ActiveCampaign ActiveCampaign

If your agency has, say, 10–100+ clients and you want one place for CRM + email + SMS + automations + client accounts + reporting, I'd choose HighLevel.

If you tell me how many clients you manage and whether you want clients to log in themselves, I can narrow it down to the best 2–3 platforms and compare their 2026 pricing, SMS/email costs, white-labeling, and client limits.

If your agency wants to actually build and send email + SMS campaigns for multiple clients from one agency environment, my top pick is HighLevel.

🥇 Best overall: HighLevel

HighLevel is designed around the agency model: you have an agency-level dashboard, then separate client sub-accounts underneath it. You can control staff access across multiple client accounts, while keeping each client's contacts, campaigns, automations, CRM, etc. separated. help.gohighlevel.com

It combines:

• Email campaigns
• SMS campaigns
• Automated workflows/sequences
• CRM & pipelines
• Landing pages/forms
• Appointment booking
• Conversation inbox
• Client sub-accounts
• Agency-level user permissions
• White-labeling

That makes it particularly good if you're selling "we manage your marketing" rather than simply providing email reporting.

HighLevel official website

Other strong options

If you're primarily an ecommerce agency, I'd seriously consider Klaviyo instead. If you're a lead-gen/local-business agency, HighLevel is usually the more natural fit.

One important distinction: AgencyAnalytics is excellent if what you mean by "one dashboard" is seeing/reporting on all your clients' campaign performance. It supports 85+ data sources and roll-up dashboards across clients, but it's primarily a reporting/analytics layer, not the system I'd choose to actually execute email/SMS campaigns. agencyanalytics.com

So, if I had to pick one for an agency managing 10–100+ clients: HighLevel.

For an agency managing multiple clients’ email + SMS campaigns from one dashboard, you’ll usually want a platform with multi-account workspaces, client separation, automation, reporting, and ideally white-label options. Good options:

My shortlist by agency model:

• You run a lead-gen/marketing agency and want to resell a platform: GoHighLevel is usually the first one to evaluate.
• You mainly manage newsletters, lifecycle email, and ecommerce campaigns: ActiveCampaign or Campaign Monitor.
• You want a lightweight email/SMS dashboard for many small-business clients: Brevo or NotifyBulk.
• You want your clients to see your own branded software: prioritize platforms with white-label subaccounts. systeme.iowww.replyagent.com

A few questions would narrow it down:

1. How many clients are you managing (5, 50, 500+)?
2. Do clients need their own login/dashboard?
3. Do you want to resell the software under your agency brand (white-label/SaaS), or just manage campaigns internally?
4. Are you sending mostly promotional campaigns or automated follow-ups (leads, appointments, nurture sequences)?

If your agency manages multiple clients’ email and SMS campaigns from one dashboard, you’ll want a platform with multi-client workspaces, client permissions, automation, reporting, and ideally white-label options. Some strong options:

My shortlist by agency type:

• You run a lead-gen / growth agency: HighLevel is usually the most complete all-in-one choice.
• You mainly manage newsletters, promotions, and lifecycle email: Zoho Campaigns or DailyStory are better focused options. www.dailystory.comwww.zoho.com
• You sell SMS marketing as a service: Messaro or NotifyBulk are worth evaluating. notifybulk.commessaro.com
• You want to resell the software under your own brand: Look for white-label features (HighLevel, systeme.io, and some agency-focused platforms offer this). systeme.io

For most agencies managing 5–100+ clients, I’d compare HighLevel vs DailyStory vs Zoho Campaigns first. The deciding factors are usually:

1. Do you need a CRM/funnel builder, or just campaigns?
2. Do clients need their own login?
3. Do you want to bill clients for access (SaaS/white-label model)?
4. How much SMS volume do you send?

I can also narrow this down to the best fit if you tell me roughly how many clients you manage and whether you need white-labeling.

If you’re a marketing agency managing multiple clients, my first choice would be HighLevel (GoHighLevel).

It’s specifically designed around the agency model:

• One agency dashboard with separate client sub-accounts. www.gohighlevel.comhelp.gohighlevel.comwww.gohighlevel.comhelp.gohighlevel.comhelp.gohighlevel.com
• Email + SMS campaigns and automated workflows in the same platform. help.gohighlevel.com
• Unified inbox for client conversations across email, SMS and other channels. www.gohighlevel.com
• Clone campaigns/workflows and deploy them to different clients, which is useful if you serve a particular niche. www.gohighlevel.com
• Client permissions so your staff can access selected accounts without exposing everything. www.gohighlevel.comhelp.gohighlevel.comwww.gohighlevel.comhelp.gohighlevel.comhelp.gohighlevel.com
• White-labeling is available if you want clients to see your agency's branding rather than HighLevel's. www.gohighlevel.com
• HighLevel's current setup also includes built-in email infrastructure and bulk/scheduled/drip SMS capabilities. help.gohighlevel.comhelp.gohighlevel.com

How I'd compare the main options

Bottom line: If your agency wants to manage, say, 10–100+ client accounts from one operating system, while running both email and SMS campaigns, HighLevel is probably the strongest fit.

If you tell me how many clients you manage and whether they're mostly local businesses, ecommerce, B2B, etc., I can narrow it down to the best 2–3 platforms and their current pricing/features.

For a marketing agency managing multiple clients, my top pick is HighLevel (GoHighLevel).

HighLevel official site

Why HighLevel fits agencies

• One agency dashboard: You can manage separate client sub-accounts from a central agency view. help.gohighlevel.com
• Email + SMS campaigns: Build automated nurture sequences using both email and text messaging. www.gohighlevel.com
• Separate client data: Each client gets its own workspace, contacts, campaigns, pipelines, conversations, etc., while your team can access them from the agency account. help.gohighlevel.com
• Unified inbox: Email, SMS and several other messaging channels can be managed in one conversation interface. www.gohighlevel.com
• Reusable campaigns: You can build workflows/templates and deploy them across clients rather than rebuilding everything from scratch. www.gohighlevel.com
• White-label option: Higher-tier agency plans allow you to brand the platform with your own domain and branding, which is useful if you want clients to perceive it as your agency's software. www.gohighlevel.com
• Email infrastructure: HighLevel now has built-in LC Email, while agencies can also connect their own Mailgun infrastructure if desired. help.gohighlevel.com
• SMS/phone: Its LC Phone system provides messaging without necessarily requiring you to manage a separate Twilio setup. help.gohighlevel.com

Other options

HubSpot does have multi-account management, but its current implementation is primarily positioned for customers with multiple HubSpot accounts and requires Marketing Hub Enterprise for the feature. knowledge.hubspot.com

If your agency wants one login where your team can jump between 10, 50, or 100+ client accounts and run their email/SMS campaigns, automations, CRM, conversations, and reporting, I'd start with HighLevel.

If you tell me how many clients you manage and whether they're mainly local businesses, ecommerce, SaaS, or something else, I can narrow it down to the best platform and plan for your agency.

If you're a marketing agency managing multiple clients' email + SMS campaigns from one dashboard, my top recommendation is HighLevel (GoHighLevel).

HighLevel official site

Why HighLevel fits agencies

• One agency dashboard — manage multiple client accounts/sub-accounts without maintaining completely separate logins. www.gohighlevel.com
• Email campaigns — broadcasts, automated sequences, workflows, templates and tracking.
• SMS campaigns — bulk SMS, scheduled messages, drip campaigns and two-way messaging are built in. www.gohighlevel.comhelp.gohighlevel.comwww.gohighlevel.ai
• Client separation — each client can have its own contacts, pipelines, automations and reporting while your agency manages them centrally. www.gohighlevel.comwww.gohighlevel.ai
• Automations — you can build workflows such as new lead → text immediately → email 10 minutes later → follow-up text 2 days later.
• Snapshots/templates — useful if you repeatedly deploy similar campaign systems for new clients.
• White-labeling — on eligible plans, you can put your agency's branding/domain on the platform so clients can experience it as your own software. www.gohighlevel.comwww.gohighlevel.ai

HighLevel vs. alternatives

The big distinction is that HighLevel is designed around agencies having multiple client accounts, rather than forcing an agency to manage everything inside one company's CRM. www.gohighlevel.comwww.gohighlevel.ai

If your agency has, say, 10–50+ clients, I'd strongly look at HighLevel first. It can effectively become the agency's central CRM + email + SMS + automation platform.

If you tell me how many clients you manage and whether you want to send campaigns for clients or let clients log in and manage their own campaigns, I can recommend the best HighLevel setup/plan and a couple of alternatives.

If your agency needs one dashboard to manage email + SMS campaigns across multiple clients, my first choice in 2026 would be HighLevel.

Why HighLevel fits an agency

• Separate client accounts: You create a sub-account for each client while managing them from your agency dashboard. help.gohighlevel.comwww.gohighlevel.com
• Email + SMS in one platform: You can build campaigns/workflows, send bulk SMS, and manage email communications without switching platforms. help.gohighlevel.com
• Automation: Build nurture sequences that combine email, SMS, calls, etc., and replicate workflows for other clients. help.gohighlevel.comwww.gohighlevel.com
• Client reporting: Email and SMS performance can be surfaced in dashboards and reports. gohighlevelassist.freshdesk.com
• White-label option: If you want clients to experience the software under your agency's branding, HighLevel supports white-labeling on its Agency Pro plan. www.gohighlevel.com
• Reusable templates: You can standardize campaigns/workflows and deploy them across client accounts, which is particularly useful if you're running similar campaigns for multiple businesses. help.gohighlevel.comwww.gohighlevel.com

Other options worth considering

Bottom line: If you're an agency managing, say, 10–100+ clients and want each client to have their own contacts, campaigns, automations and reporting while your team controls everything centrally, HighLevel is probably the closest match to what you're describing. www.gohighlevel.com

If you tell me how many clients you manage, whether they're mostly ecommerce or lead-gen, and whether you want to white-label the platform, I can narrow it down to the best 2–3 options and compare their pricing/features.

For an agency managing multiple clients' email + SMS campaigns from one dashboard, I’d put HighLevel at the top of the list.

Why it fits agencies particularly well:

• One agency dashboard: Each client gets a separate sub-account, while your team can access and manage them from the agency account. help.gohighlevel.comhelp.gohighlevel.com
• Email + SMS: You can build automated email/SMS follow-up sequences and campaigns inside each client account. www.gohighlevel.comhelp.gohighlevel.com
• Reusable campaigns: Workflows, funnels, and other setups can be replicated across clients, which is useful if your agency has standardized services. www.gohighlevel.comhelp.gohighlevel.com
• Unified conversations: Client email, SMS and other channels can be managed through a unified inbox. www.gohighlevel.comhelp.gohighlevel.com
• Client isolation: Each client has their own contacts, campaigns, automations and workspace rather than everything being mixed together. help.gohighlevel.comhelp.gohighlevel.com
• White-label option: On the appropriate agency plan, you can brand the platform with your agency's domain/logo and potentially resell it to clients. www.gohighlevel.comhelp.gohighlevel.com
• Agency billing/rebilling: Higher-tier plans support agency billing/rebilling capabilities, including email and phone/SMS usage. help.gohighlevel.com

Other options worth considering

systeme.io — interesting if you want a simpler all-in-one agency platform with client subaccounts, email, funnels and automation, plus white-label capabilities. systeme.io

HubSpot — stronger if your clients need sophisticated CRM, sales, reporting and enterprise marketing capabilities, but it can become considerably more expensive/complex when you're operating across many clients.

My recommendation: If your agency's core service is lead generation + email/SMS nurturing + automated follow-up for multiple businesses, I'd start with HighLevel. Its agency/sub-account architecture is specifically designed around that use case.

If you tell me how many clients you manage (e.g. 10, 50, 100+) and whether you want to white-label it, I can narrow this down to the best 2–3 platforms and compare pricing, SMS/email costs, automation, reporting, and client access.

For an agency managing multiple clients' email + SMS campaigns from one dashboard, my first recommendation is HighLevel (GoHighLevel).

Why it fits agencies particularly well:

• One agency dashboard with separate sub-accounts for each client. www.gohighlevel.com
• Email + SMS campaigns and automation are built in, so you don't need a separate Mailchimp/ActiveCampaign + SMS platform. www.gohighlevel.com
• Unified inbox lets your team handle client conversations across SMS, email, Instagram, Facebook, WhatsApp and chat. www.gohighlevel.com
• Reusable workflows/templates — build a campaign once and deploy variations to multiple clients. www.gohighlevel.com
• Client-level permissions so employees can be restricted to particular accounts. help.gohighlevel.com
• White-labeling is available if you want clients to experience the platform under your agency's branding. help.gohighlevel.com
• Automated reporting can send performance reports to clients on a schedule. help.gohighlevel.com

The basic structure

Your Agency
→ Client A sub-account
→ Client B sub-account
→ Client C sub-account
→ Client D sub-account

Each client has their own contacts, campaigns, automations and data, while your team manages them through the agency environment.

One important caveat: if you're sending SMS to U.S. numbers, each client generally needs their own A2P 10DLC brand/campaign registration; you can't simply register one brand for all clients. www.ghlscaleup.com

If you tell me roughly how many clients you manage (e.g. 10, 50, 200+) and whether you need white-labeling, I can compare HighLevel vs HubSpot vs Klaviyo vs ActiveCampaign specifically for an agency setup.

For a marketing agency managing multiple clients, my first choice would be HighLevel (GoHighLevel).

It is specifically structured around agencies: you get an agency dashboard with separate client sub-accounts, while your team can manage each client's CRM, campaigns, automations, conversations, email, and SMS from the same platform. help.gohighlevel.comwww.hubspot.com

Why HighLevel fits an agency

The big advantage is that Client A's contacts, campaigns, automations and conversations stay separate from Client B's, while your agency retains centralized control. HighLevel also supports agency-level user permissions and assigning staff to particular client accounts. help.gohighlevel.com

HighLevel vs. HubSpot

I'd generally choose:

• HighLevel → agency with lots of SMB/local-business clients, especially if you're selling marketing automation as a service.
• HubSpot → agency working with larger companies that need sophisticated CRM, reporting, attribution and integrations.

HubSpot itself positions its platform more around unifying marketing, sales and service for individual businesses, whereas HighLevel's architecture is explicitly built around agencies and client sub-accounts. help.gohighlevel.comwww.hubspot.com

If your main requirement is “I want one login/dashboard where my agency can run email + SMS campaigns for 10, 20, 50+ clients,” I'd strongly shortlist HighLevel first.

If you tell me roughly how many clients you have and whether you need white-labeling, I can compare HighLevel with 3–5 alternatives and tell you which is the best fit for your agency.

If your agency needs to manage multiple clients' email + SMS campaigns from one place, my top recommendation is HighLevel (GoHighLevel).

Why HighLevel fits an agency

• One agency dashboard: Create separate client sub-accounts while managing them from a central agency account. help.gohighlevel.comwww.gohighlevel.com
• Email + SMS: Build campaigns, automations, follow-ups, and multi-step workflows for each client. help.gohighlevel.comhelp.gohighlevel.com
• Client separation: Each client can have their own contacts, campaigns, CRM, automations, calendars, and reporting. help.gohighlevel.comwww.gohighlevel.com
• Templates/Snapshots: Build a campaign or automation once and replicate the setup for new clients, which can dramatically reduce onboarding time.
• Client permissions: You can restrict employees or clients to specific sub-accounts and control what they can access. help.gohighlevel.comhelp.gohighlevel.com
• White-label option: If you want to sell the platform as part of your agency's service, HighLevel supports custom branding and domains on its higher agency plans. help.gohighlevel.comwww.gohighlevel.com
• Reporting: Agency-level reporting can be scheduled for client accounts, including email, SMS, contacts, appointments, and other metrics. help.gohighlevel.com

How I'd compare the main choices

Bottom line: If you're an agency managing, say, 10–100+ clients and want each client isolated while your team operates from one system, I'd start with HighLevel. Its architecture is specifically designed around agency → client sub-accounts rather than forcing you to maintain a separate marketing platform for every client. help.gohighlevel.comwww.gohighlevel.com

If you tell me how many clients you manage and whether you need email/SMS only or also CRM, lead tracking, automations, and reporting, I can narrow it down to the best 2–3 platforms and their current pricing.

If your agency manages multiple clients and you want email + SMS campaigns from a centralized agency dashboard, my first choice is HighLevel (GoHighLevel).

HighLevel

Why HighLevel fits agencies

• Separate client accounts/sub-accounts — each client can have their own contacts, campaigns, automations, pipelines, etc., while your team manages them from the agency level. help.gohighlevel.com
• Email + SMS in the same platform — useful if you're building coordinated nurture and follow-up sequences.
• Automations/workflows — build campaigns once and reuse them across clients.
• White-labeling — useful if you want clients to experience the software under your agency's brand.
• Client/team permissions — you can restrict employees or clients to particular accounts. help.gohighlevel.com
• Agency-oriented architecture — unlike many conventional email platforms, it's designed around the agency → multiple clients relationship. www.gohighlevel.ai

How I'd compare the main options

HubSpot is worth considering if your agency handles sophisticated CRM/reporting and larger organizations. Its current Multi-Account Management feature can provide centralized management across separate HubSpot accounts, while its Brands functionality handles multiple brands within an account. www.hubspot.com

My recommendation: If your core business is running lead-gen, nurture, email/SMS automation, funnels, and CRM for many SMB clients, start with HighLevel. If you're primarily an ecommerce retention agency, I'd look much more closely at Klaviyo instead.

If you tell me roughly how many clients you manage (e.g. 5, 20, 100+) and whether they're mostly ecommerce or lead-gen/local businesses, I can narrow it down to the best 2–3 platforms and compare their current pricing.