head to head · open source
Sentry vs defmt
Sentry has 45,704 GitHub stars, 4,959 forks, 2,265 open issues and last shipped yesterday. defmt has 1,241 stars, 135 forks, 117 open issues and last shipped 3 days ago. Sentry leads on adoption by 3,583% (45,704 vs 1,241 stars). Sentry is written in Python under a custom or non-standard licence; defmt is written in Rust under Apache-2.0. Sentry has attracted 11% as many forks as stars, defmt 11%. Sentry 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
| Sentry | defmt | |
|---|---|---|
| GitHub stars | ★ 46K | ★ 1.2K |
| License | Custom / other | Apache-2.0 |
| Written in | Python | Rust |
| Last push | 2026-11-04 | 2026-11-02 |
| Forks | ⑂ 5.0K | ⑂ 135 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Sentry if
- You weight community size — 46K stars and counting
- You want the Custom / other license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick defmt if
- You want the defmt 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 defmt fits your workflow better
About Sentry
Users and logs provide clues. Sentry provides answers. What's Sentry? Sentry is the debugging platform that helps every developer detect, trace, and fix issues. Code breaks, fix it faster. Official Sentry SDKs JavaScript Electron React Native Python Ruby PHP Laravel Go Rust Java/Kotlin Objective C/Swift C\ /F\ C/C++ Dart/Flutter Perl Clojure Elixir Unity Unreal Engine Godot Engine PowerShell Resources Documentation Discussions (Bugs, feature requests, general questions) Discord Contributing Bug Tracker Code Transifex (Translate Sentry\!)
read the full Sentry overview →
About defmt
defmt defmt ("de format", short for "deferred formatting") is a highly efficient logging framework that targets resource constrained devices, like microcontrollers. For more details about the framework check the book at . Components This repository contains the following packages: MSRV The minimum supported Rust version is 1.76 (or Ferrocene 24.05) for the crates that cross compile to your microcontroller. The minimum supported Rust version is 1.83 for all host side crates. The defmt crates are tested against the latest stable Rust version and the MSRV. Developer Information Running Tests Tests are run using…
read the full defmt overview →
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Frequently asked questions
Is Sentry or defmt more popular?
Sentry has 45,704 GitHub stars and defmt has 1,241. Sentry has the larger community by that measure.
Are Sentry and defmt free?
Both are open source. Sentry has no licence declared in this registry, and defmt is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Sentry and defmt?
Sentry is written in Python and defmt 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, Sentry or defmt?
Choose Sentry if you want the larger community (45,704 stars) or its Custom / other licence terms. Choose defmt if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.