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Delta Chat vs Molly: catalog facts
Delta Chat	Molly
Free Free and open source under the GPL 3.0. Free chatmail relays are provided, or use any…	Free Free and open source; donations via Open Collective
Windows, macOS, Linux, Android, iOS	Android
Works with any email account, or with a provided chatmail relay Reaches people who do not use Delta Chat at all	Encrypts the local app database with a user passphrase Supports UnifiedPush notifications without Google services
Encryption only applies when the other side supports Autocrypt Email metadata such as subject and timing is visible to mail servers	Android only Registration uses a phone number able to receive SMS or calls, or linking as a Signal linked device
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: AGPL-3.0-only
No account needed	Account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 20, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.