head to head · open source
OpenViking vs utoipa
OpenViking has 41,383 GitHub stars, 3,362 forks, 999 open issues and last shipped yesterday. utoipa has 4,141 stars, 416 forks, 248 open issues and last shipped 14 days ago. OpenViking leads on adoption by 899% (41,383 vs 4,141 stars). OpenViking is written in Python under AGPL-3.0; utoipa is written in Rust under Apache-2.0. OpenViking has attracted 8% as many forks as stars, utoipa 10%. 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 | utoipa | |
|---|---|---|
| GitHub stars | ★ 41K | ★ 4.1K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Python | Rust |
| Last push | 2026-11-02 | 2026-10-20 |
| Forks | ⑂ 3.4K | ⑂ 416 |
| 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 utoipa if
- You want the utoipa feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Rust
- You evaluated both and utoipa 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 utoipa
utoipa Auto generated OpenAPI documentation Pronounced /u:ˈtoʊ:i.pɑ/ or /u:ˈtoʊˌaɪ.piˈeɪ/ whatever works better for you. Want to have your API documented with OpenAPI? But don't want to be bothered with manual YAML or JSON tweaking? Would like it to be so easy that it would almost be utopic? Don't worry: utoipa is here to fill this gap. It aims to do, if not all, then most of the heavy lifting for you, enabling you to focus on writing the actual API logic instead of documentation. It aims to be minimal , simple and fast . It uses simple proc macros which you can use to annotate your code to have items…
read the full utoipa overview →
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Frequently asked questions
Is OpenViking or utoipa more popular?
OpenViking has 41,383 GitHub stars and utoipa has 4,141. OpenViking has the larger community by that measure.
Are OpenViking and utoipa free?
Both are open source. OpenViking is licensed under AGPL-3.0 and utoipa under Apache-2.0. Neither carries a licence fee.
What is the difference between OpenViking and utoipa?
OpenViking is written in Python and utoipa in Rust. 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 utoipa?
Choose OpenViking if you want the larger community (41,383 stars) or its AGPL-3.0 licence terms. Choose utoipa if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.