head to head · open source
huginn vs defmt
huginn has 50,269 GitHub stars, 4,339 forks, 698 open issues and last shipped yesterday. defmt has 1,241 stars, 135 forks, 117 open issues and last shipped yesterday. huginn leads on adoption by 3,951% (50,269 vs 1,241 stars). huginn is written in Ruby under MIT; defmt is written in Rust under Apache-2.0. huginn has attracted 9% as many forks as stars, defmt 11%. huginn 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
| huginn | defmt | |
|---|---|---|
| GitHub stars | ★ 50K | ★ 1.2K |
| License | MIT | Apache-2.0 |
| Written in | Ruby | Rust |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 4.3K | ⑂ 135 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick huginn if
- You weight community size — 50K stars and counting
- You want the MIT license terms
- Your stack matches Ruby
- 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 huginn
What is Huginn? Huginn is a system for building agents that perform automated tasks for you online. They can read the web, watch for events, and take actions on your behalf. Huginn's Agents create and consume events, propagating them along a directed graph. Think of it as a hackable version of IFTTT or Zapier on your own server. You always know who has your data. You do. Here are some of the things that you can do with Huginn: Track the weather and get an email when it's going to rain (or snow) tomorrow ("Don't forget your umbrella!") List terms that you care about and receive email when their occurrence on…
read the full huginn 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 huginn or defmt more popular?
huginn has 50,269 GitHub stars and defmt has 1,241. huginn has the larger community by that measure.
Are huginn and defmt free?
Both are open source. huginn is licensed under MIT and defmt under Apache-2.0. Neither carries a licence fee.
What is the difference between huginn and defmt?
huginn is written in Ruby 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, huginn or defmt?
Choose huginn if you want the larger community (50,269 stars) or its MIT licence terms. Choose defmt if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.