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Signal Server project preview
CommunicationAlternative to Threema WorkAlternative to Telegram MTProtoAlternative to WhatsApp Server

Signal Server

Enterprise-grade end-to-end encrypted messaging server infrastructure powering Signal.

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LicenseAGPL-3.0
GitHub stars15.0k
Last commit5 days ago
Tags5 topics
CommunicationSecure Communication ServerZero Knowledge RoutingEncrypted Voice SignalingEnd To End Encrypted Messaging
Overview

Why consider Signal Server?

Signal Server is the open-source backend server for the Signal messaging protocol built in Java. It orchestrates zero-knowledge message routing, encrypted voice/video call signaling, contact discovery, and attachment blob stores.

Guided learning

Learn Signal Server by building

Practical setup notes, real use cases, and copy-ready examples in one focused guide.

1 min read 2 sections
In this guide2 sections

Overview of Signal Server

Signal Server coordinates private, end-to-end encrypted messaging without storing user message contents.

Quickstart

bash
1git clone https://github.com/signalapp/Signal-Server.git
2cd Signal-Server
3mvn clean package

Configure your AWS S3 bucket and Redis cluster to route encrypted message envelopes.

Signal Server is licensed under the GNU Affero General Public License v3.0.

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Signal Server FAQs

Signal Server is listed as a Communication tool on TiloBox. Review the overview, features, and official documentation on this page to decide whether it solves your specific workflow.

Start with the project's GitHub repository and official website for supported installation and deployment instructions. Test the setup with representative data or a small project before rolling it out more widely.

Signal Server is listed under the AGPL-3.0 license. Read the complete license text and the project's notices before using, modifying, or distributing the software.

Production readiness depends on your requirements. Review maintenance activity, security practices, documentation, backup and upgrade procedures, and compatibility with your stack; then validate it in a non-production environment.

Signal Server is listed as an alternative to Threema Work. Compare the core workflow, deployment model, integrations, and licensing against your must-have requirements before switching.