WhatsApp Messenger is a free, secure messaging and calling app used by over 2 billion people globally for simple, reliable communication.

Keybase is an end-to-end encrypted platform for secure messaging, file-sharing, and team collaboration for individuals and groups.

Signal Messenger is a secure messaging app for private communication and is used by individuals seeking privacy.

Delta Chat is the best secure messaging app for privacy-conscious users and is used by individuals seeking decentralized communication.

Element is the best secure messaging app for decentralized communication and is used by organizations prioritizing data sovereignty.