Side by side
Arel vs Hydra
Both stand on database query builders. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan LinuxMacWindows
Visit Arel Free plan Open source APILinuxSelf-hosted+1
Hydra provides build, test, and reporting workflows for Nix projects, including jobsets and Flake support. It is a self-hosted option with NixOS deployment requirements, database backup needs, and a reported queue-runner issue.
Visit HydraThe facts
| Arel | Hydra | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Yes |
| Runs on | Linux, Mac, Windows | API, Linux, Self-hosted, Web |
| Lowest paid plan | Not published | Free or on request |
| Plans published | None | 1 |
| Maker | Not published | Not published |
| Website | github.com | github.com |
| On database query builders | #5 of 55 | #1 of 55 |
Arel: what it does well
Hydra: what it does well
- Free and licensed under GPL-3.0.
- Builds packages, ISO images, and tarballs.
- Jobsets can trigger on input changes.
- Provides a JSON API.
What to know first
- Running Hydra is currently supported only on NixOS.
- No hosted option is listed.
- Some state is stored in the database, requiring backups.
- The queue runner can sometimes leave builds unscheduled.