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Fadr vs StemRoller: catalog facts
Fadr	StemRoller
Freemium Fadr Basic is free with unlimited use; Fadr Plus costs $10 a month or $100 a year.	Free Free, released under your choice of the Unlicense or MIT No Attribution.
Web	Windows, macOS
Unlimited basic stem separation on the free plan Key, tempo, chord and MIDI detection alongside stems	One-click stem separation using Demucs Built-in YouTube search to find songs
Finer stems, WAV downloads and plugins require Fadr Plus Songs are uploaded to Fadr's servers for processing	Linux is not officially supported Splitting a song takes several minutes
Web application	Downloadable app
Closed source	Open source
License not stated	License: Unlicense OR MIT-0
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 26, 2026	Official website Full listing and sources Checked October 2, 2026

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