Notion AI is the AI layer built into Notion — search, an "agent" for multi-step tasks, and meeting notes — now bundled only into Notion's Business ($20+/user/month) and Enterprise plans after the standalone $10 add-on was retired in 2025. Custom AI agents additionally consume metered credits on top of the plan price.
FastGPT takes a different approach: rather than layering AI onto an existing docs workspace, it's a self-hostable platform for building your own AI knowledge base with visual workflows and retrieval-augmented generation (RAG), so your documents and the AI querying them stay on infrastructure you control.
FAQ
Is there a free, open-source alternative to Notion AI?
Yes. FastGPT is open source (Apache-2.0) and free to self-host, without Notion's per-seat plan requirement or metered credits.
What's the best open-source alternative to Notion AI?
FastGPT is the closest fit if what you actually want is a self-hosted, RAG-powered knowledge assistant rather than an AI feature bolted onto a docs tool.
What are the top open-source alternatives to Notion AI?
Browse all open-source alternatives to Notion AI above, or explore the full Developer Tools category for more options.