Delta Chat.
By Delta Chat contributors
Delta Chat is a decentralized messenger. The homepage describes instant messaging with multiple profiles and devices, signup through interoperable chatmail relays, web apps inside chats, and audited end-to-end encryption against network and server attacks. The Android client is GPL-3.0-or-later and links Google Play, F-Droid, and other downloads. Neither page states a monetary download price.
The F7 Insight
A messenger gets more interesting when the address is not trapped in one company's directory. Delta Chat keeps the Android app on ordinary Internet standards and chatmail, so the encryption story and the account story are the same product.
A closer look.
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Instant messaging with more than one profile and more than one device.
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Accounts use interoperable chatmail relays.
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Chats can include interactive web apps for games and collaboration.
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End-to-end encryption is described as audited against network and server attacks.
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The Android client links Google Play, F-Droid, and get.delta.chat.
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The Android repository is licensed GPL-3.0-or-later.
Sources & credits
Verified against the sources below. Features, pricing, and availability may change; check the creator’s current information before installing or buying.
- Official homepage: decentralized messaging, chatmail, web apps, and encryption; no download price statedChecked 15 Oct 2026
- Android readme: Play id chat.delta, F-Droid, other downloads, and GPLv3+Checked 15 Oct 2026
- GPL-3.0-or-later text for the Android client, including the fastlane iconChecked 15 Oct 2026
Artwork acknowledgments
Delta Chat Android icon from the repository fastlane metadata by Delta Chat contributors. The readme says the client is GPLv3+ and the LICENSE file does not exclude this icon. Image used unmodified.