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Sonarr vs SickGear: catalog facts
Sonarr	SickGear
Free Free and open source under the GPL. Indexers and Usenet providers you connect it to may…	Free Free and open source.
Windows, macOS, Linux, Self-hosted	Windows, macOS, Linux, Self-hosted
Scans an existing library and fills in missing episodes automatically Upgrades files when a better quality release appears, without being asked	Automates finding and downloading TV episodes Organises episodes into a media library
Useless on its own; it needs indexers and a download client Indexers and Usenet access usually cost money	Needs separate download clients and indexers Setup assumes some self-hosting experience
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: GPL-3.0	License not stated
No account needed	No account 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 1, 2026

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