6 Best AI Agent Builders for Agencies (2026)

Updated 2026-10-13 · 1213 words

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Quick pick: if your business model is reselling AI chat agents to multiple clients under your own brand, Stammer is the platform actually built for that, branded domains, client subaccounts, and a dashboard that keeps the underlying vendor invisible to your clients. If you're building fewer, more custom agents for higher-touch clients instead of reselling a templated product, Voiceflow or Botpress fit that model better. We compared six platforms specifically on what matters to an agency: can you brand it as your own, can you isolate client data, and does the pricing leave room for margin.

Comparison table

1. Stammer: best for pure white-label reselling

Stammer is built around the agency reseller model specifically, not retrofitted onto a general chatbot product. Its Agency tier adds a white-label dashboard, your own logo and domain, and client subaccounts, so a client logging in sees your brand, not Stammer's, and you set your own markup on top of whatever the platform charges you underneath. The entry Starter plan covers a single agent for agencies still learning the category, with the Agency tier scaling to cover a real client roster.

When NOT to use it: if you want deep, custom agent logic for a single high-value client rather than a repeatable product across many smaller ones, Stammer's templated reseller model is built for volume, not bespoke engineering; a platform like Voiceflow or Botpress gives you more room to build something genuinely differentiated.

Try Stammer

2. Voiceflow: best for custom, higher-touch client builds

Voiceflow's visual canvas is built for designing a conversation flow collaboratively before layering in AI reasoning, which suits agencies pitching a differentiated, brand-specific agent rather than a reselled template. Its voice-agent tooling is notably more mature than most of the field, a real advantage if a client wants an IVR-style phone agent alongside chat. You're building and billing per client project here, not running a reseller dashboard; clients typically see the finished agent embedded on their own site, not a Voiceflow-branded portal.

When NOT to use it: skip it if your model is volume reselling of a mostly-templated agent to many small clients; Voiceflow's per-seat, design-heavy workflow doesn't scale the same way a purpose-built reseller platform does.

Try Voiceflow

3. Botpress: best for dev-heavy agencies wanting cost control

Botpress pairs a visual flow builder with LLM reasoning, and its open-source core means a technically capable agency can self-host and brand the underlying infrastructure itself, the closest thing to true white-labeling on this list outside a purpose-built reseller platform. That control comes at the cost of real engineering time; self-hosting, branding, and maintaining a multi-tenant setup yourself is a meaningfully bigger lift than paying for Stammer's dashboard.

When NOT to use it: if nobody on your team wants to own infrastructure, the managed cloud version still works for client delivery but doesn't give you the white-label depth that makes self-hosting worth the extra setup. Our Botpress vs Voiceflow comparison covers that specific matchup if you're choosing between the two.

Try Botpress

4. Relevance AI: best for multi-agent client systems

Relevance AI is built around teams of agents working together rather than a single chat widget, which fits an agency client whose actual need is a multi-step process, research, drafting, review, handoff, not a simple FAQ bot. Pricing runs on a dual-meter model: a flat charge each time a tool or agent runs, plus the underlying model cost passed through separately, which makes per-client cost estimation less predictable than a flat reseller fee until you've run a client's actual workload through it.

When NOT to use it: if a client just needs a single support or lead-qualification chat agent, Relevance AI's multi-agent complexity is overkill; a simpler, single-agent tool will get the same job done with far less setup and more predictable billing.

Try Relevance AI

5. Chatbase: best for fast, low-cost single-widget clients

Chatbase gets a simple, document-trained chat widget live for a client faster than almost anything else on this list, which makes it a reasonable choice for an agency's smallest or most budget-conscious clients who just need a working FAQ bot on their site. White-labeling (removing Chatbase's own branding) is a separate paid add-on rather than bundled into a reseller tier, and Chatbase's own published terms put client pricing, billing, and support on the agency, not the platform, so you're handling client-facing operations yourself either way.

When NOT to use it: skip it for any client whose need goes beyond a document-trained FAQ widget; Chatbase isn't built for the multi-agent or highly custom workflows Relevance AI or Voiceflow handle.

Try Chatbase

6. Lindy: best for an agency's own internal ops, not resale

Lindy earns a spot here for a different reason than the rest of the list: it's genuinely strong for an agency's own internal AI employee, triaging the agency's inbox, qualifying inbound leads, drafting client-update emails, work you do for yourself rather than resell to a client. It has no white-label or reseller program, so using it to deliver an ongoing branded product to clients doesn't fit its design; you'd be handing a client a Lindy-branded interface, not your own.

When NOT to use it: don't use Lindy as your client-facing reseller product; use it to run your own agency more efficiently while a purpose-built platform like Stammer handles what you actually sell to clients. Our Lindy review covers where it holds up for that internal-ops use case in more depth.

Try Lindy

How to choose

• Choose Stammer if your business model is reselling branded AI agents to many clients and you want the reseller tooling (subaccounts, white-label domain, your own markup) built in from the start.
• Choose Voiceflow or Botpress if you're building fewer, more custom agents for higher-value clients who want something genuinely differentiated, not a templated resale.
• Choose Relevance AI when a client's actual need is a coordinated multi-agent process, not a single chat widget.
• Choose Chatbase for your smallest, most budget-conscious clients who just need a working FAQ bot fast.
• Choose Lindy to run your own agency's internal operations, not as the product you hand to clients.

Whichever platform you pick, check client-data isolation before you sign your first real client, not after. A white-label logo on the login page is cosmetic; what actually protects you is each client's documents, conversation history, and API keys living in a genuinely separate subaccount rather than a shared workspace with access controls layered on top. If you're weighing a workflow-automation platform instead of a pure agent builder for client delivery, our best no-code AI agent builders roundup covers that broader category, and our best general-purpose AI employees guide is the better starting point if what you're actually selling is "an AI employee" framing rather than a branded chat widget.

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