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

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