The right AI agent platform for an agency depends on what you sell. If you sell AI receptionists, website chat widgets or automations, pick an agent builder such as GoHighLevel, Stammer.ai, Voiceflow or n8n; if you sell your own review playbook and want clients to use it inside their own ChatGPT or Claude, none of those do that, and ExpertRelay is built for exactly that one job.
So the useful question isn't which platform is best, but where your client will use what you sell. Below are 11 options grouped by that answer.
What are you actually selling to clients?
- Something your client's customers talk to: a chat on the client's site, a WhatsApp bot, or a phone line that answers and books calls.
- Something that works in the background: lead routing, CRM updates, follow-up emails. The client sees the result, not the tool.
- Your own judgment, for the client: say you run paid social for 12 clients. On Monday one asks: "CPA is up 22% this week, should we cut spend?" You want the answer to follow your playbook and arrive in the AI app the client already opens every day.
The first two are well served. None of the usual lists has a category for the third.
Which AI agent platforms do agencies use in 2026?
Prices are the vendors' own published figures as of October 2026, and they change, so check the linked page before you buy.
Agent builders and automation
GoHighLevel
- What you'd sell: a marketing system per client (CRM, funnels, follow-up) with AI chat and voice.
- Where the client uses it: their own account under your brand; their customers get a chat widget and phone line.
- Billing per client: yes. Agency Pro adds SaaS mode, so you can sell subscriptions and rebill phone and email with markup.
- Price: Starter $97/month, Unlimited $297, Agency Pro $497; Conversation AI and Voice AI usage costs extra.
- Skill needed: moderate; it's a large system to learn.
- Limitation: you're adopting a whole CRM, not just an AI feature.
n8n
- What you'd sell: automations: lead routing, reporting, AI steps in workflows.
- Where the client uses it: they don't; it runs in the background.
- Billing per client: no, you bill clients yourself.
- Price: Cloud Starter from €20/month billed annually (2,500 workflow runs a month); the self-hosted Community edition is free.
- Skill needed: high; you'll work with APIs and data.
- Limitation: every client's workflows are yours to build and maintain.
MindStudio
- What you'd sell: small AI apps built without code.
- Where the client uses it: a web app, an embed on a website, a Chrome extension or an API. It can also publish an agent as a connection AI apps like Claude can use.
- Billing per client: not on its pricing page.
- Price: Free for one agent and 1,000 runs a month; Individual $20/month; both plus model usage at the providers' prices.
- Skill needed: low to moderate.
- Limitation: client accounts and billing are yours to handle.
Relevance AI
- What you'd sell: agents for sales and support teams, such as prospecting.
- Where the client uses it: in the background, on tools like their CRM, Slack or Gmail.
- Billing per client: not described.
- Price: the pricing page lists only an Enterprise plan through sales.
- Skill needed: moderate.
- Limitation: built for a company's own teams; no public price.
Chat and voice agents you resell under your brand
Stammer.ai
- What you'd sell: chat and voice agents for local businesses.
- Where the client uses it: their customers reach it on the website, SMS, Facebook, Instagram, WhatsApp or by phone.
- Billing per client: yes. Each client prepays a wallet and usage is charged at the prices you set.
- Price: Standard $49/month; Pro White Label $99/month removes Stammer's branding and adds your domain.
- Skill needed: low.
- Limitation: it answers your client's customers, not your client, and any agency can resell the same product.
Voiceflow
- What you'd sell: support agents for chat and voice.
- Where the client uses it: their customers reach it on web, app, WhatsApp, SMS or voice.
- Billing per client: the agency plan lists multi-client workspaces, rebranding and client handoff tools, with usage-based billing.
- Price: no public price; there's a free trial without a card.
- Skill needed: moderate to high; built for support teams.
- Limitation: no published price; made for support conversations.
Evoriqa
- What you'd sell: a branded agent per client across chat, WhatsApp, SMS, email and phone.
- Where the client uses it: your branded dashboard, and their customers use a chat on the client's site.
- Billing per client: you bill each client on your own Stripe at your price; you pay Evoriqa per agency plan, with a spend cap per client.
- Price: Freelancer $79/month for 5 client workspaces, up to Pro $499 for 70.
- Skill needed: low to moderate.
- Limitation: clients work in your dashboard, not inside their own ChatGPT or Claude.
Dante AI
- What you'd sell: a chatbot trained on each client's website and files.
- Where the client uses it: a chat widget on the client's site.
- Billing per client: only by giving each client its own workspace and bill; Dante's agency page lists agency billing and custom domains as not there yet.
- Price: Starter $40/month, Advanced $120 (3 agents), Pro $400 (10 agents).
- Skill needed: low.
- Limitation: no reseller billing yet.
Botsify
- What you'd sell: chat agents under your brand, with some voice minutes.
- Where the client uses it: their customers reach it on the website, Messenger, SMS, WhatsApp, Instagram, Telegram or Slack.
- Billing per client: the agency plan lists your domain, reselling rights and flexible billing.
- Price: not published; the agency plan starts with a demo call.
- Skill needed: low to moderate.
- Limitation: no agency price before a sales call.
Which ones work inside a client's own ChatGPT or Claude?
Most of the tools above give clients a portal, a widget or a phone line. Two options live inside the AI app itself:
Custom GPTs and Claude Projects (the built-in option)
- What you'd sell: a set of instructions and files inside ChatGPT or Claude.
- Where the client uses it: inside ChatGPT or Claude.
- Billing per client: no.
- Price: included in the AI subscription.
- Skill needed: low.
- Limitation: personal ChatGPT accounts (Free, Go, Plus, Pro) can no longer create new GPTs, and OpenAI plans to retire custom GPTs on December 11, 2026. Claude Projects are shared only with members of your own organization on Team or Enterprise plans, so a client would have to join your workspace.
ExpertRelay
- Best for: selling your agency's own reviews inside clients' ChatGPT and Claude.
- Not for: website chat widgets, AI receptionists or workflow automation.
- What you'd sell: a review from your playbook, such as "why did CPA rise?", run on each client's own account.
- Where the client uses it: their own Claude, ChatGPT (Plus or Pro) or Cursor, set up in about two minutes, or a web page. Clients connect at ai.youragency.com once you verify your domain.
- Billing per client: you pay $99 a month for the agency plan plus $49 a month per client you turn it on for (no setup fee, 14 days free, card required) and charge clients however you already do, such as in the retainer. 300 reviews per client a month, or a lower cap you set.
- Skill needed: low; you write the review down as instructions and examples. No code.
- Limitation: it can read a client's ad accounts, Google Analytics 4, Shopify and HubSpot but never changes a campaign, budget or record, and useful answers can reveal parts of how you think: your files stay private, but nothing stops someone piecing things together from answers.
Unlike a shared GPT or Project, removing a client ends their access at once and takes their seat off the bill; they keep their chats but never had your files. Improve a review once and every client gets it on their next question. For the built-in options, see Claude Skills vs agents vs Projects and the GPT retirement.
How do you choose?
- Clients need calls answered or site chats handled: Stammer.ai, Voiceflow, Botsify, Dante AI or Evoriqa.
- You want one system for CRM, funnels and AI: GoHighLevel.
- You sell automations and have someone technical: n8n, or Relevance AI for larger teams.
- You want quick small AI apps without code: MindStudio.
- Clients pay you for judgment and already ask ChatGPT between calls: ExpertRelay.
You don't have to pick one. Reselling a chatbot vs selling your own playbook covers that choice in depth.
When you don't need ExpertRelay
- Clients want something their customers talk to. We don't make chat widgets or phone agents.
- You want AI to change campaigns or budgets. Our reviews only read.
- One or two clients happy to join your workspace. A shared Claude Project on a Claude Team plan may be enough.
- Your clients don't use ChatGPT Plus or Pro, Claude or Cursor, and won't use a web page either.
If clients pay you for what you'd conclude from their numbers and already ask ChatGPT about them, see how ExpertRelay works for agencies →
FAQ
What is the best AI agent platform for a marketing agency?
It depends on what you sell: Stammer.ai, Voiceflow, Botsify, Dante AI or Evoriqa for chat and voice agents; GoHighLevel for a CRM with AI; n8n for automations; ExpertRelay for your own playbook inside clients' ChatGPT or Claude.
Can I give clients an AI that uses my agency's playbook inside their own ChatGPT or Claude?
Yes. Claude Projects are shared only inside your own organization and custom GPTs are being retired, so the practical route is a hosted tool the client adds to their own AI app. ExpertRelay does this for $99 a month plus $49 a month per client.
Which AI platforms let agencies bill per client?
As of October 2026: GoHighLevel's Agency Pro plan (SaaS mode), Stammer.ai's client wallets, Evoriqa through your own Stripe. ExpertRelay doesn't bill your clients: you pay $99 a month plus $49 a month per client and include it in your retainer or a higher tier. Dante AI lists agency billing as not available yet.
Do I need to code to sell AI to clients?
Not always. MindStudio is built for no-code use and ExpertRelay needs only your written playbook; n8n and Voiceflow reward technical skill.
