Signal
The gold-standard encrypted messenger, free and genuinely private
At a glance
Confidential professional or personal conversations requiring real privacy
Our take
Signal is the messaging app privacy researchers and security professionals genuinely use, not just endorse for marketing reasons — its end-to-end encryption protocol has become the industry standard that even WhatsApp and Google Messages license. We think it’s the right choice for any professional conversation where confidentiality genuinely matters, since it’s free, open-source, and collects essentially no metadata. Network effects work against it: most contacts default to WhatsApp, iMessage, or Slack, so adoption requires convincing others to switch. It intentionally lacks the business features (bots, broad integrations) that make Slack useful for team coordination.
Key features
- ✓End-to-end encrypted messaging and calls
- ✓Disappearing messages
- ✓Open-source, independently audited protocol
- ✓Minimal metadata collection
- ✓Desktop and mobile sync
What we like
- ✓Best-in-class encryption and privacy design
- ✓Completely free, nonprofit-backed
- ✓Open-source and independently audited
- ✓No ads or data monetization
What could be better
- ✗Limited adoption compared to WhatsApp/iMessage
- ✗Few business or team collaboration features
- ✗No built-in bots or workflow integrations
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