
Docs & PDF Q&A
OpenKB
Compiles a document pile into a linked knowledge base
★ 3.8k
July 2026
Apache-2.0
Docs & PDF Q&A
What it does
Turns raw documents into wiki pages — entities for people, organisations, places and products, extracted and kept in sync — with reasoning-based retrieval that scales to long documents and native multi-modality, notably without a vector database in the stack. Pages follow Google's Open Knowledge Format. Extraction errors, particularly name confusions, are hard to spot once formatted as a tidy page, so check the source before relying on a claim. Apache-2.0.
Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.
Screenshots & visuals


Before you start
- Setup difficultySome setup needed
- Command lineRequired
- API keyRequired
- Sends data onlineYes
Judged automatically from the project's own metadata. Always confirm on the official page.
OpenKB FAQ
- Is OpenKB free?
- OpenKB itself is free, but it needs an API key for an external AI service. That service charges separately, though some have a free tier.
- Do I need to install anything or write code to use OpenKB?
- It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.
- Does OpenKB work on a phone?
- No. It needs a computer.
- Can I use OpenKB commercially?
- The licence is Apache-2.0, which permits commercial use. Conditions such as keeping the copyright notice still apply, so read the licence text before shipping it inside something.
How it compares
The conditions that decide whether you can actually use it, side by side.
| Tool | Command line | API key | Sends data out | Phone | Commercial use |
|---|---|---|---|---|---|
| OpenKB (this page) | Required | Required | Yes | No | Yes |
| LangChain | Required | Required | Yes | No | Yes |
| Docling | Required | Not needed | No | No | Yes |
| llm-app | Required | Required | Yes | No | Yes |
"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.