Database · privacy
Signal
Open-source encrypted messaging and voice call application from the Signal Foundation, a non-profit.
Overview
The gold standard for private messaging, with a proven security model and non-profit governance.
Details
- Website
- https://signal.org/
- Pricing model
- Core product free — non-profit, donation-supported
- Platform
- iOS, Android, desktop
- Privacy relevance
- End-to-end encryption, minimal metadata collection, open-source protocol used by other apps
- Strengths
- Industry-standard Signal Protocol, minimal data collection, open-source, regularly audited
- Limitations
- Requires phone number for registration; limited feature set compared to mainstream messaging apps
- Last reviewed
- 2026-08-19