Cable is an encrypted instant messaging and voice calling application for Android. It uses the Internet to send one-to-one and group messages, which can include images and video messages, and make one-to-one voice calls. Cable uses standard phone numbers as identifiers and end-to-end encryption to secure all communications to other Cable users.

Cable is based on Signal, but has some different goals.

This is not a company or a startup, it's a project.

These are the limitation of Signal this project tries to address:

• Signal is a centralized service, run by a single entity: Open Whisper Systems. Cable aims to build a network of federated, independent servers.
• The Signal client has some proprietary dependencies, these are removed in Cable.
• Signal users Amazon S3 to store encrypted attachments. While everything is always end-to-end encrypted, we avoid Amazon and prefer self-hosted or noncommercial solutions.
• Signal is not friendly towards third-party clients using their servers, Cable is.

The clients are published as free and open-source software under the GPLv3 license. The server code is published under the AGPLv3 license.