Signal Private Messenger

Health v2 · maintenance only

Adoption not part of the score

29262 stars · 6857 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Signal is a free, open-source private messenger offering end-to-end encrypted text, voice, and video communication, built on the Signal Protocol (including post-quantum PQXDH and Double Ratchet). It spans Android, iOS, and Desktop clients with a companion server and libsignal cryptographic libraries.

Use cases

• send encrypted messages to friends
• make private voice and video calls
• replace whatsapp with a privacy-focused messenger
• chat securely without ads or trackers
• self-host or study an e2e-encrypted messaging protocol
• integrate the signal protocol into another app via libsignal

When to choose

• you need strong, always-on end-to-end encryption for messaging and calls
• you want a free, ad-free messenger backed by a nonprofit
• you need cross-platform clients (Android, iOS, Desktop)
• you want to study or reuse a battle-tested cryptographic protocol

When to avoid

• you need a self-hostable server for a small team - Signal's server is designed for its own network
• you require anonymous registration without a phone number
• you need heavy enterprise features like admin compliance tooling or directory integration

Facets

application · maturity stable

chat-interface cryptography security video-processing audio-processing privacy messaging-platforms security cross-platform cross-platform self-hosted end-to-end-encryption signal-protocol messenger voice-calls video-calls post-quantum-cryptography nonprofit android ios desktop

Member repositories

For agents

markdown · JSON · MCP: product_card(name="signalapp/Signal-Android")