Glean is a proprietary enterprise AI search platform that indexes 100+ workplace apps to power search, a conversational assistant, and autonomous agents. Pricing isn't published; buyers commonly report a per-user base license plus a separate AI add-on fee, with realistic total cost of ownership for a mid-sized deployment running into the hundreds of thousands of dollars a year once infrastructure and support fees are included.
FastGPT offers a self-hostable path to the same underlying capability — a knowledge base with retrieval-augmented search — without Glean's enterprise sales process or consumption-based credit system.
FAQ
Is there a free, open-source alternative to Glean?
Yes. FastGPT is open source (Apache-2.0) and free to self-host, without Glean's per-user licensing and FlexCredit add-ons.
What's the best open-source alternative to Glean?
FastGPT is the closest open-source match for building a searchable, RAG-powered knowledge layer, though matching Glean's 100+ prebuilt enterprise connectors will take more integration work on your end.
What are the top open-source alternatives to Glean?
Browse all open-source alternatives to Glean above, or explore the full Developer Tools category for more options.