An AI personal knowledge base is a private assistant that searches and answers questions over your own notes and files.
In plain words
You point the app at your notes, PDFs, Word files or a Notion workspace. It indexes them, and when you ask something it finds the relevant passages and has a language model answer from them, much like RAG. Open-source options such as Khoj can run on your own computer or server, and can use either a cloud model or one running locally, which keeps your notes under your control.
A quick example
Imagine you keep years of class notes in Markdown files. You ask "What did I write about photosynthesis last spring?" The assistant searches the notes, pulls out the matching entries and summarises them, pointing back to the files it used.
Where you'll meet it
- Searching your own notes, papers and saved documents.
- Plug-ins for note apps such as Obsidian.
Related
Sources
- Docskhoj, Khoj (GitHub) · read 29 Sept 2026
- DocsBuild a semantic search engine with LangChain, LangChain docs · read 29 Sept 2026
Checked by WhatIsAI against the sources above · 29 Sept 2026. Spotted an error? Report it.