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#2 Signal
Free, open‑source messenger with strong end‑to‑end encryption, disappearing messages, and minimal data collection.
#3 Telegram
Cloud‑based chat app offering secret chats with E2EE, large group support, bots, and a robust API.
#4 WhatsApp
Widely used mobile messenger with default end‑to‑end encryption, voice/video calls, and multimedia sharing.
#5 Wire
Secure collaboration platform with E2EE, file sharing, video calls, and compliance certifications (ISO, GDPR).
#6 Wickr Me
Privacy‑first messenger offering self‑destructing messages, anonymous registration, and military‑grade encryption.
Open‑source, decentralized chat client built on the Matrix protocol; supports E2EE, bridges to other services, and self‑hosting.
#8 Discord
Community‑focused platform with text/voice channels, rich media integration, and optional server‑level encryption.
#9 Slack
Team collaboration hub with channels, integrations, file sharing, and optional Enterprise Key Management for encryption.
#10 Microsoft Teams
Integrated Office 365 chat and meeting solution with enterprise‑grade security, compliance, and collaboration tools.
#11 Mattermost
Open‑source, self‑hosted Slack alternative offering private messaging, channel organization, and end‑to‑end encryption plugins.
#12 Rocket.Chat
Self‑hosted chat platform with real‑time translation, video conferencing, and optional E2EE for direct messages.
#13 Line
Popular Asian messenger with stickers, timeline, voice/video calls, and optional hidden chat encryption.
#14 WeChat
All‑in‑one Chinese app combining messaging, social media, payments, and mini‑programs; offers encrypted chats but not end‑to‑end by default.
#15 Viber
Cross‑platform messenger with end‑to‑end encrypted calls, stickers, and public chat channels.
#16 Kik
Casual chat app focused on anonymity and bots, supporting text, images, and group chats.
#17 Threema Work
Enterprise version of Threema offering admin console, device management, and compliance‑ready encryption.
#18 Session
Decentralized messenger built on the Loki network; no phone number required and provides onion‑routing privacy.
#19 Briar
Peer‑to‑peer messenger for Android that works over Bluetooth, Wi‑Fi, or Tor; no central server, fully encrypted.
#20 Tox
Open‑source, decentralized network offering encrypted instant messaging, voice, and video without servers.
#21 Jami
Free, distributed communication platform with E2EE voice, video, and messaging; works without a central server.