head to head · open source
OpenViking vs NoteDiscovery
OpenViking has 41,383 GitHub stars, 3,362 forks, 999 open issues and last shipped yesterday. NoteDiscovery has 2,867 stars, 248 forks, 4 open issues and last shipped yesterday. OpenViking leads on adoption by 1,343% (41,383 vs 2,867 stars). OpenViking is written in Python under AGPL-3.0; NoteDiscovery is written in JavaScript under MIT. OpenViking has attracted 8% as many forks as stars, NoteDiscovery 9%. NoteDiscovery was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (knowledge-base), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| OpenViking | NoteDiscovery | |
|---|---|---|
| GitHub stars | ★ 41K | ★ 2.9K |
| License | AGPL-3.0 | MIT |
| Written in | Python | JavaScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 3.4K | ⑂ 248 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenViking if
- You weight community size — 41K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick NoteDiscovery if
- You want the NoteDiscovery feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and NoteDiscovery fits your workflow better
About OpenViking
The Context Database for AI Agents English / 中文 / 日本語 Website · Live Demo · GitHub · Issues · Docs · Blog Lark · WeChat · Discord · X What is OpenViking OpenViking is an open source context database for AI agents — one filesystem for everything an agent knows: knowledge, memory, and skills. Most agent memory is a black box: text goes in, embeddings come out, and nobody can see what was actually stored. OpenViking organizes context as a virtual filesystem under viking:// instead. Agents navigate it like files — ls , tree , read , write , grep — and you can open any directory to inspect and edit what your agent…
read the full OpenViking overview →
About NoteDiscovery
NoteDiscovery Your Self Hosted Knowledge Base What is NoteDiscovery? NoteDiscovery is a lightweight, self hosted note taking application that puts you in complete control of your knowledge base. Write, organize, and discover your notes with a beautiful, modern interface—all running on your own server. Write · Find · Discover 🎯 Who is it for? Privacy conscious users who want complete control over their data Developers who prefer markdown and local file storage Knowledge workers building a personal wiki or second brain Teams looking for a self hosted alternative to commercial apps Anyone who values simplicity…
read the full NoteDiscovery overview →
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Frequently asked questions
Is OpenViking or NoteDiscovery more popular?
OpenViking has 41,383 GitHub stars and NoteDiscovery has 2,867. OpenViking has the larger community by that measure.
Are OpenViking and NoteDiscovery free?
Both are open source. OpenViking is licensed under AGPL-3.0 and NoteDiscovery under MIT. Neither carries a licence fee.
What is the difference between OpenViking and NoteDiscovery?
OpenViking is written in Python and NoteDiscovery in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, OpenViking or NoteDiscovery?
Choose OpenViking if you want the larger community (41,383 stars) or its AGPL-3.0 licence terms. Choose NoteDiscovery if its feature set, stack or MIT licence fits better. Both are self-hostable.