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Delta Chat vs Olvid: catalog facts
Delta Chat	Olvid
Free Free and open source under the GPL 3.0. Free chatmail relays are provided, or use any…	Free The homepage presents Olvid as free messaging for everyone and does not list prices.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS
Works with any email account, or with a provided chatmail relay Reaches people who do not use Delta Chat at all	No phone number, email or personal details needed to use it Never requests access to the address book
Encryption only applies when the other side supports Autocrypt Email metadata such as subject and timing is visible to mail servers	Contacts must also install Olvid to chat with you Pricing and licensing details are not stated on the homepage
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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