Best Free AI Agents
TL;DR: The best truly free options are open-source tools like n8n and Aider (you only pay for model usage), plus free tiers from Lindy and Zapier Agents. With Agent Selector's Agent Builder you can also build and test agents free using your own API key.
Two kinds of "free"
- Free tiers — limited monthly usage on cloud apps (Lindy, Zapier Agents).
- Open-source — free software; you only pay for the model/hosting (n8n, Aider, OpenHands).
How to run an agent for (almost) free
Bring your own API key and pay the model provider pennies per run — no platform fees. The Agent Builder supports this directly.
Frequently asked questions
Are there truly free AI agents?
Yes - open-source agents like n8n and Aider are free software; you only pay for model usage. Many cloud agents also offer free tiers.
How can I use an AI agent for free?
Use an open-source agent or a free tier, or bring your own API key in the Agent Builder and pay only the model provider's low per-use cost.
Not sure which agent fits? Get matched in 2 minutes.
Start the selector