Instant Onboarding and Instant Message Delivery

May 31, 2024 - A major milestone in our 6+ years long project history: With the rolling 1.46 app releases you can start chatting without a pre-existing e-mail address. Just provide a name and then tap “Agree and continue” to create a chat profile using the default chatmail server. Or visit other chatmail servers and tap the invite on their home page. Read on...

Hardening Guaranteed End-to-End encryption based on a security analysis from ETH researchers

March 25, 2024 - We released guaranteed end-to-end encryption in November 2023 and were in for a pleasant surprise three months later. The Applied Cryptography Group at ETH Zurich handed us a cryptographic security analysis of our SecureJoin protocol implementation which is the basis of Delta Chat’s guaranteed end-to-end encryption mechanisms. We subsequently fixed 20 identified issues that became part of the v1.44 release but only disclose it now because we first wanted Delta Chat apps with all fixes to be available on all stores. Read on...

Four major usability improvements in Delta Chat 1.44

March 12, 2024 - Delivery time! The rolling Delta Chat 1.44 releases bring four often requested usability improvements. Visit to onboard and invite anyone, instantly and securely, and without them needing an e-mail address or a phone number first. Some claim no other messenger suite today is as easy to onboard and use. True or not? In any case, we are already busy with preparing next usability improvements to avoid any doubts :) Read on...

Webxdc (Psst!) reclaiming Peer-to-Peer Web technology

February 15, 2024 - While blockchain projects hailed “decentralization” and “Web3” as a paradigm change, expending billions of dollars and development hours in the last decade, they failed to create even a baseline specification for packaging and running P2P web apps like the one we started in 2022 with webxdc. Read on...

Chatmail - replicable, fast and secure chatting infrastructure for all

December 13, 2023 - Today, we are unveiling chatmail services, making onboarding with Delta Chat a breeze, with peace of mind: Read on...

Guaranteed End-to-End encryption and many other good news

November 23, 2023 - Our rolling 1.42 Delta Chat app releases introduce guaranteed end-to-end encryption, a major security milestone that took many hundreds of hours of challenging work from core Delta Chat teams, experts and collaborators. Friends from activist circles, users and operators of security-related helplines, as well as TeamUSEC all helped us to streamline usability and implementation issues for guaranteed end-to-end encryption. Read on...

Everything-apps without platforms - say 'hi' to xstore 😊

August 11, 2023 - Others are hand-wavingly chattering about so called “super-app” or “everything app” architectures, but we prefer to just deliver and improve them. Today, we are happy to announce a new way to find and start webxdc “everything” apps, among them: Read on...

Introducing DeltaTouch, a new community created client for Ubuntu Touch

July 02, 2023 - Hi, this is Lothar aka lk108. I’m today’s guest on the blog and it’s my pleasure to introduce DeltaTouch, a third-party client based on deltachat-core-rust for the mobile phone OS Ubuntu Touch (UT). The app has just been released on the OpenStore for both the xenial and the focal channel of UT. Here’s what it looks like: Read on...

WebXDC apps can now exchange data and run on other messengers!

June 28, 2023 - Earlier this year we worked hard to enforce WebXDC app privacy but what good is having totally private apps if there is no convenient way to exchange data with the rest of the world? With the Delta Chat 1.38 releases we introduced two new WebXDC APIs to safely and conveniently exchange data with other tools and apps. Read on...

Bringing E2E privacy to the Web: 4th security audit 😅

May 22, 2023 - Delta Chat’s “web apps shared in a chat” come with a unique privacy promise but in January it was shown to be compromised. We got into a surprising struggle with Web browser sandboxing issues that took us several months to come out ahead of. Read on...

Good news from security audits, past and present

March 27, 2023 - In case you wonder how safe Delta Chat’s core messaging implementation and server guides are, you may be interested in the summary statement from the recent independent security audit by Cure53: Read on...

New Guide for Setting up Mail Servers for Delta Chat - and Upcoming Workshops!

January 27, 2023 - Every once in a while we get asked what mail server is best suited for Delta Chat. In short - most mail servers will work well, and reliability depends more on their IP reputation and configuration parameters like spam checking, rate limits, and attachment size how well it works with Delta Chat. One feature-complete mail-server we have successfully worked with is Mailcow. Read on...

Older posts

December 2022 - Decentralization Unchained (Psst ... want a UI/UX dev job?)

September 2022 - Introducing Automatic E-mail Address Porting (AEAP)

June 2022 - Sharing web apps in a chat

January 2022 - Which e-mail providers work well with Delta Chat? Quite some :)

November 2021 - Updates on Accounts, Downloads, Group-Joins, Search and more

November 2021 - New data protection officer appointed and refined privacy policies

September 2021 - What Makes a Good E-Mail Provider? Let's find out :)

August 2021 - Chat Requests, Multi-Account, Connectivity

May 2021 - E-mail compatibility releases

February 2021 - Delta Chat iOS is catching up!

November 2020 - Swipe to Reply and other Android News

August 2020 - Final report on UX developments 2019/2020

July 2020 - Releases, Disappearing messages and Video chats

June 2020 - Delta Chat 1.10 is rolling out

May 2020 - Delta Features for May - ECC Keys, Autodelete Messages, Scan QR Codes With Desktop

May 2020 - Russia's request for Delta Chat user data ... declined.

April 2020 - New Delta/Desktop Release for Windows, macOS, and Linux

March 2020 - New Study on Multi-tool and Organizational messenger usage

March 2020 - Shining some light on Delta Chat bots

March 2020 - Saving Network Traffic - Delta's Efforts to Reduce the Message Size

March 2020 - Pin Chats, Provider Database, Offline Help and more

January 2020 - Delta Chat Released for iPhones and iPads - Get it Now at the iOS Appstore!

December 2019 - Delta Chat 1.0 with new features, more robust, faster and more secure

October 2019 - Women and Nonbinary People Learning how to Install Mail Servers - Delta Chat at /ETC

July 2019 - UX and needfinding report Delta Chat

June 2019 - New stable Delta Chat Android with improved group-profiles, video recording, notifications, ...

June 2019 - New desktop release with RPGP, location streaming and improved mac & ubuntu builds

May 2019 - Location matters! UX testing, the Rustocalypse and other Delta Xyiv happenings ...

March 2019 - Key findings of first Delta Chat UX testing in Kyiv

March 2019 - New Android releases with OAUTH2 and improved e-mail interactions

February 2019 - Play Store, OAuth2 and more from the dev stage

January 2019 - DeltaChat multi-platform releases rolling ...

December 2018 - DeltaChat Ukraine/Needfinding report / 35c3

November 2018 - Delta-XI in Kyiv 2018… a lot of beginnings

October 2018 - Decentralization Unchained

October 2018 - OpenPGPSummit 2018: The ecosystem is moving ...

October 2018 - Delta Chat android-dev state

October 2018 - Delta.Chat desktop update

October 2018 - now working

September 2018 - Big update on developments

August 2018 - Introducing the New Support Forum: Join to Help Others and Discuss Features!

June 2018 - Delta Chat 0.18.0, improved reliability and more

May 2018 - Time to relax: Delta Chat and the GDPR

May 2018 - Delta Chat on HACKarnaval in Paris

May 2018 - Delta Chat not vulnerable to EFAIL

March 2018 - Delta Chat 0.16.0 with Ad-hoc-groups; new Mailing list and IRC

February 2018 - Delta Chat 0.15.0 with Voice Messages, Elevate Festival and more

February 2018 - Delta Chat 0.14.0 - Gossip-And-Setup-Message Version

January 2018 - Delta Chat 0.13.0 - Reply-Encrypted-Release

January 2018 - Delta Chat 0.12.0 - a minor release

December 2017 - Details about the #34C3 Delta Chat session

December 2017 - Sessions on #34C3 and other news

November 2017 - Delta Chat 0.10.0, Semantic versions, APK

November 2017 - Delta Chat 0.9.7 (The archived one), iOS and docs

October 2017 - Delta Chat 0.9.6 - a little bugfix release

October 2017 - Delta Chat 0.9.5 - "Get your data out of there"-Release

October 2017 - Delta Chat on Desktop

August 2017 - Follow our news on friendica network

August 2017 - Delta Chat 0.9.4, Group images, Status, Fixes

July 2017 - A little summer break - Expect news end of August

July 2017 - Delta Chat 0.9.3, Read receipts, Portugues homepage

July 2017 - Read receipts and Social pressure

June 2017 - Delta Chat v0.9.2 feat. Autocrypt Level 1

June 2017 - New Transifex page

June 2017 - A little update - Delta Chat v0.9.1 released, Languages

June 2017 - Follow us via RSS or Twitter

June 2017 - Delta Chat v0.9.0 introducing PGP

May 2017 - Delta makes chatting better

May 2017 - Yeah! Delta Chat has a blog now!