Signal is the gold standard for encrypted messaging, with 70 million monthly active users in 2025 — outperforming #1 WhatsApp in privacy by design. Its open-source Signal Protocol, adopted by WhatsApp, iMessage, and Skype, protects billions of messages daily without any data collection. A key advantage: Signal requires no phone number exposure for usernames, whereas WhatsApp ties accounts to phone numbers. With 100% of its code auditable and a $50 million annual budget funded by users, Signal is 30% faster than the average messaging app in message delivery.
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