https://www.paulgraham-nia.com/

* Nia gives coding agents accurate context by indexing entire codebases, documentation, and packages. It fixes hallucinations by letting agents retrieve real source information instead of guessing. Developers ship faster because AI can read and understand their actual project. This is a different use case of Nia but apparently it also works.

You can chat with it and ask any question because it has access to Nia’s knowledge base, which indexed all of his personal essays. The agent is able to call multiple tools that directly use Nia’s API:

• NiaWebSearch - searches the web • searchEssays - semantic search over all essays • browseEssays - shows the full tree of essays • listDirectory - lists essays in a path • readEssay - reads full essay content • grepEssays - regex pattern search • getSourceContent - retrieves full source by identifier

Models: anthropic/claude-sonnet-4.5 moonshotai/kimi-k2-thinking xai/grok-4-fast-reasoning alibaba/qwen3-vl-thinking

It’s fully free and open source.

Try it: https://www.paulgraham-nia.com/ Code: https://github.com/nozomio-labs/paulgraham-ai