Signal is a free, open-source messaging app using the Signal Protocol, developed by the Signal Foundation. It offers encrypted calls, messages, and group chats with no data collection, no ads, and complete transparency about its encryption implementation.
| Pricing from | Free |
| Best for | Journalists, activists, and security professionals requiring military-grade encryption. |
| Website | www.signal.org |
Strengths and trade-offs
- 100% open source with peer-reviewed encryption
- Completely free with no ads or data harvesting
- Limited business features compared to enterprise platforms
- Group chat management tools are minimal
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