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Spectrum 2 vs mautrix-signal: catalog facts
Spectrum 2	mautrix-signal
Free Free and open source.	Free Free and open source; the developer accepts sponsorship.
Self-hosted	Self-hosted
Bridges users on different IM networks Runs on your own server	Brings Signal chats into any Matrix client Puppeting sends messages as your own Signal account
Server software that needs setup and an existing messaging server Little end-user documentation on the homepage	Requires your own Matrix homeserver and a Signal account Messages are decrypted on the bridge server, so you must trust that machine
Self-hosted	Self-hosted
Open source	Open source
License: GPL-3.0	License: AGPL-3.0
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 October 2, 2026

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