Delta Chat is a messenger that uses the largest, most diverse and decentralized communication system ever created: the existing e-mail server network. Just use your standard e-mail account and start chatting with any of your e-mail contacts, whether they have installed Delta Chat or not.

Technically, Delta Chat is an e-mail application but with a modern chat interface. E-Mail in a new dress if you will. Chat and contact data remain on your devices. No uploads or centralized control of addressbook, calendar or other personal data. There simply are no Delta Chat servers where anything could be uploaded to.

Use Delta Chat with anyone out of billions of people: just use their e-mail address. Recipients will see a simple e-mail and may directly reply with their own e-mail app. They don't need to install Delta Chat, visit websites or sign up anywhere. If you send a picture or other media to a chat group your chat recipients will see a nice regular e-mail with an attachment. If they send a message and attachments back, you will see the media in your chat for this contact.

Delta Chat sends e-mails using your e-mail account and provider of choice. You can change mobile numbers without any trouble or even work without any SIM card or phone number at all. End-to-end encryption is established automatically when chat partners start communicating with each other.

Delta Chat is a relatively young project, but already has a lot to offer. It employs a pragmatic and usability-driven approach to decentralized messaging. No re-inventing of wheels unless one of them causes actual trouble or concern. We rather often think about removing technology than adding yet more of it, trying to keep things maintainable and understandable for us and others. Most popular programming languages and many human languages are involved in the development of Delta Chat apps and the various activities around it.

We are grateful for any help, be it contributing good bug reports, helping other users on the forum, participating in our open development with PRs and reviews, translations to more languages, working on new bots or setting up new experimental mail servers.

What’s New

Version 1.14.2

* new swipe-to-reply option
* disappearing messages: select for any chat the lifetime of the messages
* scroll chat to search result
* fast scrolling through all chat-messages by long tapping the scrollbar
* show quotes in messages as such
* add known contacts from the IMAP-server to the local addressbook on configure
* enable encryption in groups if preferred by the majority of recipients
(previously, encryption was only enabled if everyone preferred it)
* speed up configuration
* try multiple servers from autoconfig
* check system clock and app date for common issues
* improve multi-device notification handling
* improve detection and handling of video and audio messages
* hide unused functions in "Saved messages" and "Device chat" profiles
* bypass some limits for maximum number of recipients
* add option to show encryption info for a contact
* show impact of the "Delete messages from server" option more clearly
* fix launch if there is an ongoing process
* fix errors that are not shown during configuring
* fix mistakenly unarchived chats
* fix: do not fetch from INBOX if "Watch Inbox folder" is disabled
and do not fetch messages arriving before re-enabling
* fix: do not use STARTTLS when PLAIN connection is requested
and do not allow downgrade if STARTTLS is not available
* fix: make "nothing found" hints always visible
* fix: update selected avatars immediately
* fix: tons of improvements affecting sending and receiving messages
* update provider database and dependencies
* add Slovak translation, update other translations

Ratings and Reviews

4.7 out of 5
13 Ratings

13 Ratings


merlinux GmbH
41.8 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Albanian, Azerbaijani, Basque, Catalan, Croatian, Danish, Dutch, Esperanto, French, Galician, German, Hungarian, Indonesian, Italian, Japanese, Korean, Lithuanian, Norwegian Bokmål, Polish, Portuguese, Russian, Serbian, Slovak, Spanish, Swedish, Tamil, Telugu, Traditional Chinese, Turkish, Ukrainian

Age Rating
This app may use your location even when it isn't open, which can decrease battery life.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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