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Nuclear vs Stretto: catalog facts
Nuclear	Stretto
Free Free and open source under the AGPL-3.0 licence.	Free Free to use and open source under the MIT licence.
Windows, macOS, Linux	Web, Self-hosted
Streams from multiple sources, extendable with plugins Playlist import from other services and JSON files	Imports playlists from Spotify Library sync between machines
Desktop only, no mobile app macOS may block the app on first launch	Relies on a companion Chrome extension for downloading tracks Depends on YouTube and SoundCloud as sources
Downloadable app	Web application, Self-hosted
Open source	Open source
License: AGPL-3.0-only	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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