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Tech riderRev. 4 Oct 2026

Hydra

Ch 574.9of 57 Download Manager Software
  1. 1Runs onAPI, Linux, self-hosted, Web
  2. 2CostsFree plan
  3. 3Hosted optionNo
  4. 4Self-hosted runnersYes
  5. 5Artifact or dependency cacheYes
5 lines stated Written from the maker's own pages: github.com
Visit site Alternatives
The Hydra homepage

Overview

Hydra is ranked #57 of 57 in download manager software on Specifiction. It runs on API, Linux, Self-hosted, Web. There is a free plan.

Hydra plans and pricing

All plans
Hydra Free GPL-3.0 licensed; running Hydra is currently only supported on NixOS github.com · 4 Oct 2026

Compared on download manager software

Hosted option
Nogithub.com
Self-hosted runners
Yesgithub.com
Artifact or dependency cache
Yesgithub.com

Facts

Purpose
Hydra is a continuous integration service for Nix based projects.github.com · 4 Oct 2026
Builds and tests
Hydra periodically or continuously checks out project source, builds it, runs tests, and produces reports.wiki.nixos.org · 4 Oct 2026
Intended users
Hydra is intended for Nix and NixOS package developers and is not needed simply to use NixOS.wiki.nixos.org · 4 Oct 2026
Jobsets
Jobsets are defined by their inputs, can trigger when inputs change, and may depend on other jobsets.wiki.nixos.org · 4 Oct 2026
Flakes
Hydra supports Flake jobsets whose outputs expose a hydraJobs attribute set.wiki.nixos.org · 4 Oct 2026
Build products
Hydra can build jobs such as packages, ISO images, and tarballs as part of a jobset.wiki.nixos.org · 4 Oct 2026
Integrations
Hydra jobset inputs can use Git checkout sources, and the documented examples use GitHub repositories.github.com · 4 Oct 2026
API
Hydra provides a JSON API defined by the repository's hydra-api.yaml specification.github.com · 4 Oct 2026
Deployment
The repository says running Hydra is currently only supported on NixOS and recommends the NixOS module for production.github.com · 4 Oct 2026
Security behavior
Hydra evaluates flakes in restricted mode, which prevents access to files outside the Nix store, including fetched flake inputs.wiki.nixos.org · 4 Oct 2026
Operational caveat
The wiki says Hydra stores some state in its database and a complete stateless configuration is currently not possible, so backups are needed.wiki.nixos.org · 4 Oct 2026
Known issue
The wiki reports that hydra-queue-runner can sometimes get stuck while builds remain queued and unscheduled.wiki.nixos.org · 4 Oct 2026
License
Hydra is licensed under GPL-3.0.github.com · 4 Oct 2026

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Where it ranks on Specifiction

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