head to head · open source
huginn vs defmt
huginn has 49,969 GitHub stars, 4,299 forks, 698 open issues and last shipped yesterday. defmt has 1,228 stars, 132 forks, 117 open issues and last shipped 11 days ago. huginn leads on adoption by 3,969% (49,969 vs 1,228 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 | 2026-09-18 | 2026-09-08 |
| Forks | ⑂ 4.3K | ⑂ 132 |
| 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
Huginn is an open source system for building agents that perform automated tasks online, written in Ruby and released under the MIT license. Its agents read the web, watch for events, and take actions on the user's behalf. Internally, agents create and consume events that propagate along a directed graph, which means one agent's output becomes another agent's input and a chain of small steps can be composed into a larger workflow. The project lives in the Ruby ecosystem and is distributed as an official Docker image or installed locally from a forked repository.
read the full huginn overview →
About defmt
defmt is an efficient, deferred formatting logging framework for embedded systems written in Rust, aimed at firmware developers building for resource constrained devices such as microcontrollers.
read the full defmt overview →
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Frequently asked questions
Is huginn or defmt more popular?
huginn has 49,969 GitHub stars and defmt has 1,228. 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 (49,969 stars) or its MIT licence terms. Choose defmt if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.