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Sonarr vs nefarious: catalog facts
Sonarr	nefarious
Free Free and open source under the GPL. Indexers and Usenet providers you connect it to may…	Free Free and open source under the GPL-3.0 licence.
Windows, macOS, Linux, Self-hosted	Web, Self-hosted
Scans an existing library and fills in missing episodes automatically Upgrades files when a better quality release appears, without being asked	Single app covering search, download, renaming and subtitles Quality profiles and keyword filters
Useless on its own; it needs indexers and a download client Indexers and Usenet access usually cost money	Depends on Jackett and Transmission running alongside it No tagged releases
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.