Best free AI agent builders

Activepieces

No-code, open source

Best for small teams that want a free start and a way out to self-hosting. A free plan with agents, a $20 plan, and one credit per run.

• Free forever plan: 1,000 credits a month, 5 users, no card
• One credit per run however many steps; $20 buys 10,000
• Open-source edition you can run on your own servers
• The catch: The catalog is smaller (770+ apps) and the self-hosted Community Edition leaves out Agents and Chat.

Make

No-code

Best for visual thinkers on a budget. The cheapest hosted way to wire 3,500 apps together, with agents on every plan.

• Free plan with 1,000 credits a month; Core is $16 a month in the US
• 3,500+ apps and a canvas that shows the whole scenario
• Make AI Agents on every plan, with your own LLM key if you prefer
• The catch: Every module action burns a credit, so a chatty 10-step scenario costs 10 times what it does on a per-run tool. Agents are still labeled beta.

Langflow

Developer tool, open source

Best for developers who want no license bill. Free, MIT-licensed, and every flow becomes an API or an MCP server.

• Free and open source under the MIT license
• Any major LLM or vector database, with your own keys
• Each flow is exposed as an API and an MCP server
• The catch: It is a Python tool for developers: no hosted paid plan, no app catalog, and you run the server yourself.

Zapier

No-code

Best for non-technical teams that need one specific app. If an app exists, Zapier probably connects it: 9,000+ of them.

• 9,000+ apps, the largest catalog in this comparison
• Free plan with 100 tasks a month, and a 14-day Professional trial
• Zapier Agents with a free tier of 400 activities a month
• The catch: You pay per action, AI steps can use more tasks, and Agents are a separate add-on with their own meter.

StackAI

No-code

Best for regulated companies with an IT team. A capable free tier, then nothing self-serve until an enterprise quote.

• Free plan with 500 runs a month to try the builder
• Human review steps and knowledge bases built in
• On-prem and VPC deployment, SOC 2 and HIPAA on Enterprise
• The catch: There is no paid plan between Free and Enterprise: one seat and two projects, or a sales call.

Dify

Low-code, source-available

Best for technical teams building AI apps around their documents. Workflows, agents and a knowledge base, on Dify Cloud or your own Docker host.

• Free Sandbox plan, and a self-hosted Community Edition
• Knowledge bases with document processing built in
• Every app publishes as a web app or an API
• The catch: Professional starts at $59 a month for 3 members, and the license forbids reselling it as a multi-tenant service.

Botpress

Low-code

Best for support teams with steady ticket volume. A support agent with a helpdesk attached, priced per conversation.

• Free plan with 100 conversations and 3 seats
• AI usage included in the plan, no per-seat fee
• Hot handoff to a human with the full conversation history
• The catch: The first paid plan is $189 a month for 250 conversations, and auto-recharge packs cannot be switched off.