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Spectrum 2 vs Heisenbridge: catalog facts
Spectrum 2	Heisenbridge
Free Free and open source.	Free Free and open source.
Self-hosted	Self-hosted
Bridges users on different IM networks Runs on your own server	Works like an IRC bouncer controlled from Matrix Docker builds and a Synapse docker-compose example
Server software that needs setup and an existing messaging server Little end-user documentation on the homepage	Requires your own Matrix homeserver Updates are infrequent
Self-hosted	Self-hosted
Open source	Open source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is 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.