head to head · open source
OpenViking vs flatnotes
OpenViking has 41,383 GitHub stars, 3,362 forks, 999 open issues and last shipped yesterday. flatnotes has 3,272 stars, 222 forks, 124 open issues and last shipped 2 months ago. OpenViking leads on adoption by 1,165% (41,383 vs 3,272 stars). OpenViking is written in Python under AGPL-3.0; flatnotes is written in Vue under MIT. OpenViking has attracted 8% as many forks as stars, flatnotes 7%. OpenViking was the more recently maintained of the two, and both are self-hostable with no licence fee.
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 | flatnotes | |
|---|---|---|
| GitHub stars | ★ 41K | ★ 3.3K |
| License | AGPL-3.0 | MIT |
| Written in | Python | Vue |
| Last push | 2026-11-02 | 2026-08-29 |
| Forks | ⑂ 3.4K | ⑂ 222 |
| 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 flatnotes if
- You want the flatnotes feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Vue
- You evaluated both and flatnotes 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 flatnotes
A self hosted, database less note taking web app that utilises a flat folder of markdown files for storage. Log into the demo site and take a look around. Note: This site resets every 15 minutes. Contents Design Principle Features Getting Started Hosted Self Hosted Roadmap Contributing Sponsorship Thanks Design Principle flatnotes is designed to be a distraction free note taking app that puts your note content first. This means: A clean and simple user interface. No folders, notebooks or anything like that. Just all of your notes, backed by powerful search and tagging functionality. Quick access to a full text…
read the full flatnotes overview →
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Frequently asked questions
Is OpenViking or flatnotes more popular?
OpenViking has 41,383 GitHub stars and flatnotes has 3,272. OpenViking has the larger community by that measure.
Are OpenViking and flatnotes free?
Both are open source. OpenViking is licensed under AGPL-3.0 and flatnotes under MIT. Neither carries a licence fee.
What is the difference between OpenViking and flatnotes?
OpenViking is written in Python and flatnotes in Vue. 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 flatnotes?
Choose OpenViking if you want the larger community (41,383 stars) or its AGPL-3.0 licence terms. Choose flatnotes if its feature set, stack or MIT licence fits better. Both are self-hostable.