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Delta Chat vs SimpleX Chat: catalog facts
Delta Chat	SimpleX Chat
Free Free and open source under the GPL 3.0. Free chatmail relays are provided, or use any…	Free Free and open source under the AGPL 3.0. The company is funded by investment and…
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS, Command line
Works with any email account, or with a provided chatmail relay Reaches people who do not use Delta Chat at all	No user identifier of any kind, so conversations cannot be correlated by account Double ratchet encryption with an additional layer for the relay servers
Encryption only applies when the other side supports Autocrypt Email metadata such as subject and timing is visible to mail servers	Connecting means exchanging a link or QR code in person or elsewhere No contact list means a lost device is a lost set of conversations unless backed up
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: AGPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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