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Open‑source messenger offering truly end‑to‑end encrypted voice and video calls using the Signal Protocol.
#3 WhatsApp
Popular mobile app that secures voice and video calls with end‑to‑end encryption based on the Signal Protocol.
#4 Viber
Cross‑platform messenger that provides end‑to‑end encrypted voice and video calls for personal and business use.
Encrypted messaging platform that introduced end‑to‑end encrypted voice calls in 2022.
#6 Threema
Swiss‑based privacy‑focused messenger with end‑to‑end encrypted voice calls and optional anonymous usage.
#7 Wire
Secure collaboration suite offering end‑to‑end encrypted voice, video, and conference calls for enterprises.
Enterprise‑grade VoIP client that uses ZRTP for end‑to‑end encrypted voice and video communications.
Open‑source video conferencing platform that can be configured for end‑to‑end encryption via the E2EE extension.
Widely used video‑conferencing service that offers optional end‑to‑end encryption for meetings and calls.
Collaboration hub with optional end‑to‑end encrypted one‑to‑one and group calls for Microsoft 365 customers.
Enterprise video‑conferencing solution that provides end‑to‑end encrypted meetings and voice calls.
Cloud communications platform offering end‑to‑end encrypted voice and video calls for businesses.
#14 3CX (SRTP + TLS)
Business phone system that secures media streams with SRTP and signaling with TLS, achieving end‑to‑end protection.
#15 Linphone
Open‑source SIP client that supports ZRTP for true end‑to‑end encrypted voice and video calls.
#16 Zoiper
Cross‑platform softphone offering ZRTP and SRTP encryption for secure VoIP communications.
#17 CounterPath Bria
Professional SIP softphone with built‑in ZRTP and SRTP support for end‑to‑end encrypted calls.
#18 Pexip
Video‑conferencing platform that provides optional end‑to‑end encryption for meetings and VoIP calls.
#19 BlueJeans (E2EE)
Cloud‑based video conferencing service offering end‑to‑end encrypted meetings and voice calls.
Online meeting solution with optional end‑to‑end encryption for secure voice and video sessions.
#21 Mattermost Calls
Self‑hosted collaboration platform that includes end‑to‑end encrypted voice and video calls via the Calls plugin.
Open‑source team chat with built‑in end‑to‑end encrypted voice and video calling capabilities.
#23 Nextcloud Talk
Self‑hosted communication suite offering end‑to‑end encrypted audio/video calls and screen sharing.
Secure messenger built on the Matrix protocol that provides end‑to‑end encrypted voice and video calls.
#25 Tox
Decentralized, peer‑to‑peer instant messenger with built‑in end‑to‑end encrypted voice and video calls.
#26 Session
Privacy‑first messenger using the Loki network, offering end‑to‑end encrypted voice calls without phone numbers.
#27 Briar
Secure messaging app that works over Tor and Bluetooth, providing end‑to‑end encrypted voice calls.
#28 Mumble (TLS)
Low‑latency, open‑source VoIP solution that secures audio streams with TLS encryption for end‑to‑end protection.
Distributed, peer‑to‑peer communication platform offering end‑to‑end encrypted voice, video, and messaging.
Open‑source SIP softphone that supports SRTP and TLS for end‑to‑end encrypted calls.
#31 Voximplant
Cloud communications platform that enables developers to embed end‑to‑end encrypted VoIP calls into apps.
API‑driven voice service that can be configured with SRTP/ZRTP for end‑to‑end encrypted calls.
#33 Signal Wire
Enterprise‑grade secure communications suite offering end‑to‑end encrypted voice, video, and messaging.
Threaded chat platform that can be paired with Jitsi/E2EE for secure voice calls within the Zulip ecosystem.