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Free to use; the cooperative accepts donations and paid memberships.

Free; developed by a nonprofit funded by grants and donations

• Works with other XMPP clients, so there is no vendor lock-in
• Simple phone number registration

• End-to-end encryption on every message and call using the open source Signal Protocol
• No ads, affiliate marketers or tracking

• Still in public beta
• iOS install requires SideStore

• Requires a phone number that can receive an SMS or phone call to register
• Desktop app requires Signal to be installed on a phone first

• Official website
• Full listing and sources

Checked October 2, 2026

• Official website
• Full listing and sources

Checked September 20, 2026