Filtered ranking
Best Open-Source Messaging Apps in 2026
4 of the 7 messaging apps ranked on listme.name match: their source code is public under an open-source license. The order uses the same scores as the full ranking.
The ranking
- 1
Signal
Encrypts chats and calls by default, publishes its client apps under AGPL-3.0 and runs on Linux, Windows and Mac. Reaching a contact means they must install it, so its reach is smaller than WhatsApp's.
Best for Private one-to-one and group messaging
AndroidiOS, iPadOSWindowsmacOSLinuxFreeOpen source
- 2
Telegram
Offers large groups, public channels and sync across phone, desktop and web with no limit on media size. Regular chats are not end-to-end encrypted by default, which Signal and WhatsApp do provide.
Best for Large groups, channels and cross-device sync
AndroidiOS, iPadOSWindowsmacOSLinuxWebFreeOpen source
- 3
Element
Encrypted, open and self-hostable on the Matrix network, with apps for every major platform. Its personal app is less familiar than WhatsApp, and organization features sit behind paid plans.
Best for Self-hosted or organization chat on Matrix
AndroidiOSWindowsmacOSLinuxWebFree plan, paid upgradesOpen source
- 4
Threema
Encrypts chats and calls by default, can be used without personal data and publishes its Android code under AGPL-3.0. The Private app costs money, so it reaches fewer people than the free mass-reach apps.
Best for Privacy-focused messaging with a one-time fee
AndroidiOSOne-time purchaseOpen source
