Drilldown: tool
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None (1) ·
End-to-end encrypted 1:1 and group messaging, plus voice/video calls, built on
the audited Signal Protocol (Double Ratchet + X3DH). ~40M monthly users. Registration
requires a phone number; usernames (added 2024) let you start chats without sharing it. (1) ·
MIT-licensed, self-hostable team chat with channels, voice/video, and broad
integration support. Its omnichannel inbox unifies live chat, email, WhatsApp, and
Telegram into one agent queue -- useful if you also want to replace a separate
customer-support tool, not just internal chat. (1)
usage notes:
None (1) ·
Explore active campaigns from the Campaigns tab. Mobile apps available on
iOS (App Store) and Android (Google Play). (1) ·
Has the most GitHub momentum of the self-hosted Slack alternatives
(~45k stars). The free Community edition covers most day-to-day needs; exceeding
Starter-plan limits blocks adding new users but does not lock you out of existing
data. (1)
rejected alternatives:
Showing below up to 3 results in range #1 to #3.