Hydra vs MuGen Wallpaper

Hydra is a continuous integration service for projects based on Nix. It checks out project source periodically or continuously, builds it, runs tests, and produces reports. Work is organized into jobsets whose inputs can trigger builds when they change; jobsets can also depend on one another. Flake jobsets are supported when their outputs expose a hydraJobs attribute set. Jobs can produce packages, ISO images, or tarballs, and jobset inputs can use Git checkout sources. Hydra also provides a JSON API. It is aimed at Nix and NixOS package developers, not people who only need to use NixOS. Hydra is open source under GPL-3.0 and listed at free. It is self-hosted, with no hosted option listed, and running it is currently supported only on NixOS; the repository recommends the NixOS module for production. Flake evaluation is restricted from accessing files outside the Nix store. Some state is stored in the database, so backups are needed, and the wiki reports that hydra-queue-runner can sometimes leave queued builds unscheduled.

MuGen Wallpaper is a macOS desktop app for dynamic video and programmable web wallpapers. It supports multiple screens, and web wallpapers can receive system utilization and screen-index information. Video speed and volume controls are included in both tiers. Playback can pause when every screen is in fullscreen mode, and the app can launch at startup. The maker says video playback uses Apple Silicon for efficient playback and lower power consumption. The MuGen Wallpaper Community lets users download and share wallpapers, with uploads reviewed before publication. Web wallpapers may opt into weather updates through OpenWeatherMap, using a supplied API key and location access, but they are limited to local resources and cannot call external APIs directly. The free plan costs nothing and allows up to 10 dynamic wallpapers. An unlock is a one-time in-app purchase with no listed price and no wallpaper limit. Community registration collects an iCloud identifier and associated Apple ID email; tokens and the weather key are stored in Keychain.