Which marketing automation software should an agency pick in 2026?

GoHighLevel is the only platform here built for agencies first. You get an agency account, and every client lives in a sub-account with its own contacts, workflows, pages and calendar. You control which team members can see which sub-accounts.

The price doesn't climb with each client. Starter is $97 a month for 3 sub-accounts. Unlimited is $297 a month with unlimited sub-accounts and lets you rebill phone and email costs to clients at cost. Founder, at $497 a month, adds rebilling with your own markup and SaaS Mode, which turns the platform into software you sell under your name. Contacts and users are unlimited on every plan. At ten clients on Unlimited, that's $29.70 per client per month; at twenty-five, $11.88.

The catch: anything consumed costs extra (SMS, email, calls, AI), and add-ons are priced per sub-account, like the branded client portal app at $49 a month each. Users report repeated wallet auto-recharges and charges after cancellation. And the learning curve is real.

Tip: cap the auto-recharge on every sub-account the day you create it, and pass usage through to clients from Unlimited onward. Start on Starter with your first three clients and move to Unlimited at the fourth, which is where per-client cost drops off a cliff.

ActiveCampaign is where agencies go when they sell email automation done properly. Its workflow builder handles conditions, waits and goals, with 900+ prebuilt recipes. Each client gets its own account, and the Agency Program gives you a reseller dashboard to jump between them.

Pricing is per client and per list size. At 1,000 contacts billed yearly, Starter is $15, Plus $49, Pro $79 and Enterprise $145 a month. Resell the licenses and your discount scales with your roster: 25% from 2 to 24 accounts, 35% from 25 to 49, 45% from 50 to 99, 55% beyond that. A single account stays at list price. ActiveCampaign doesn't bill resold clients, so you set your own price and collect it. A $49 Plus account drops to $36.75 at 25% off.

The catch: no white-label interface, and each client is one more license that grows with their contacts. Advanced CRM, SMS and some reporting are paid add-ons.

Tip: resell to clients who want an all-in retainer, refer for commission the ones who'd rather pay ActiveCampaign directly. Both live in the same partner portal. And get account number two set up fast: it's what unlocks the 25% tier on the next billing cycle.

With HubSpot, the agency doesn't resell software. It sells its work inside the client's portal. Every client owns their account, and you get access as their partner. When they leave, they keep everything, which is exactly what B2B buyers want to hear.

On the client side, Starter seats list at $20 a month. Real automation starts at Professional: $800 a month billed yearly for 3 seats, plus a mandatory $3,000 onboarding fee, so roughly $12,600 in year one. On the agency side, becoming a Solutions Partner means keeping a $400 minimum monthly spend, through the Partner Program Membership or at least $400 of HubSpot products after discount, then reaching Gold tier within 24 months.

The catch: no plan covers your roster. Each client pays HubSpot list price for their own portal, with no white label and no rebilling. For a small business, the jump to Professional is brutal.

Tip: start clients on free or Starter and only push Professional with a written plan for what they'll use (lead scoring, workflows, attribution reports). Get your agency added as the portal's partner so you have access without sharing passwords.

Brevo, formerly Sendinblue, is the cheapest way here to run email and SMS automation for a client. The free plan sends 300 emails a day, and Standard at $18 a month unlocks multi-step workflows, A/B tests and website tracking.

For an agency, the simplest model is one account per client, in the client's name, with you invited as a user. True multi-account management, with separate sub-accounts that each get their own IP and API key plus consolidated billing, is Enterprise only and quote-based. Brevo's agency partner program lets you invite clients, but only clients who haven't bought a recurring plan yet earn you commission.

The catch: Brevo suspends accounts quickly when a list throws too many bounces or complaints, and users describe support that's hard to reach during a suspension. For an agency, that's a client relationship risk.

Tip: clean every client list before the first send, and have the client open the account with their own card. If it gets suspended, it's their account, not yours, and your other clients aren't affected.

Mautic is the largest open-source marketing automation project. You install it on your own server or with a host: no license, no cap on contacts or users. For an agency, it's the only model where you control everything: domain, hosting, branding and data.

The setup that keeps coming up on the Mautic forum is one instance per client: a subdomain and a database each, on shared infrastructure. Putting several clients in a single instance raises the risk of one client seeing another's data. Forum members also advise updating all instances together, since they share the same stack.

The catch: the software is free, your time isn't. Installation, updates, email deliverability (you plug in a sending service), backups: all yours. Without technical skills on the team, the savings vanish fast.

Tip: estimate maintenance hours before choosing Mautic, and build them into your retainer. Keep one clean base instance you can clone for each new client.

Vendasta isn't just marketing automation. It's a reselling platform. You pick products from a catalog (reputation, listings, email and SMS, CRM, AI) and resell them to clients through a portal with your name on it.

Pricing is a monthly minimum, not a subscription: what you spend on qualifying products counts toward it, and if you fall short, you pay only the difference. Starter is a $99 minimum with no contract, but it's co-branded with Vendasta. A white-label client portal starts at Professional, $499 a month on a one-year contract. Premium is $999.

The catch: the one-year commitment from Professional up, and reviews describing disputed cancellation notice periods, refused refunds and slow third-party fulfillment. The automation itself is shallower than ActiveCampaign or HubSpot.

Tip: stay on Starter until three clients are paying, since there's no contract. Before Professional, get the notice period and what counts toward the minimum written into the agreement.