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Signal CLI REST API vs signal-cli: catalog facts
Signal CLI REST API	signal-cli
Free Free to run yourself.	Free The open-source software is available without a license fee. Hosting, hardware and…
Self-hosted	Windows, macOS, Linux, Command line
Send Signal messages from any script over HTTP Ships as a Docker image with a Compose file	Provides a daemon interface for notification integrations.
Needs a phone number registered with Signal Unofficial client built on signal-cli, not from Signal itself	Requires a registered or linked Signal account.
Self-hosted	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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 24, 2026	Official website Full listing and sources Checked September 22, 2026

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