Signal
Signal
Speak freely with state-of-the-art end-to-end encryption.
Signal is the gold standard for secure messaging. Its open-source Signal Protocol provides unbreakable end-to-end encryption for text messages, voice calls, and video chats, ensuring that no one—not even the Signal Foundation—can read your communications.
Funded by a non-profit foundation, it features absolutely no ads or trackers. It has become the de facto choice for journalists, activists, and anyone serious about digital privacy.
Key Features
- Industry-leading Signal Encryption Protocol
- Disappearing messages and view-once media
- Encrypted voice and video calls
- Zero advertisements or trackers
- Open-source client and server code
Frequently Asked Questions
Yes, Signal is open source. It is released under the AGPL 3.0 license.
You can use Signal as a free, open-source alternative to WhatsApp.
It is built using Python, JavaScript, Java, Kotlin, Handlebars.
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