Delta Chat

Delta Chat's avatar
Delta Chat
🛡️ delta_at_chaos.social@momostr.pink
npub17gpd...nrxn
Secure decentralized messaging for all major platforms and then some. Reliable and instant by using fast and secure Chatmail servers, but also compatible with classic e-mail providers. Offering chat-shared web apps for fun and collaboration, end-to-end encrypted and without any server side hosting. Security-Audited multiple times, last in 2024. Chat over e-mail and head back to the future with us! Avoid xkcd927 :) Website: https://delta.chat Download: https://get.delta.chat Support Forum: https://support.delta.chat
It took a while but it's shaping up nicely :) Post-Quantum Cryptography and Reliable Deletion, better known as Forward Secrecy, are going to become available in 2026 in #deltachat. For more details, including the recent #fosdem26 talk recording:
Autocrypt v2 - Post-Quantum and Reliable Deletion
Modern OpenPGP v6 certificate with post-quantum cryptography, reliable deletion, and transport-agnostic messaging for decentralized systems.
A lot of messaging systems try to reinvent the email system but many (signal, matrix, xmpp) took over one key traditional design which we actually dropped while retaining SMTP/IMAP compatibility: server-controlled identities. With #chatmail user identities are cryptographic and reside on end user devices only. Servers are only message relays and have no control over identities or chats, only perform fast message routing. See this fosdem talk by one of our lead developers
If you want to do a fun thing this weekend, maybe write a little webxdc app for your family or friends chats? There are many to fork from, see
webxdc apps
 and for development docs
Get Started - Webxdc
 And for development tooling
GitHub
GitHub - webxdc/webxdc-dev: A development server for webxdc apps
A development server for webxdc apps. Contribute to webxdc/webxdc-dev development by creating an account on GitHub.
 which simulates a multi member chat environment to run your app, before you post the zip file to a chat of yours. Everyone can start it. No app stores. No logins. No gafam. With built-in end-to-end encryption. Cheers.
#deltachat and #chatmail and #webxdc are in a unique "market" where few other cross-platform messengers can play. The unique and growing market is shaped by rising authoritarianism, internet shutdowns and restrictions. We are building a "Minecraft world of messaging" where skilled people can rip apart, modify, replace, recombine and do modding, at every level. All #foss and featuring Decent Usability and UI Offline first End-to-End encryption Standards based Resilient Decentralized
#deltachat does - no bindings to public handles/numbers - no address-book upload - not do public contact or group discovery - not have critical persistent server state (!) Social identification is private, between people though ephemeral #P2P #E2EE messages. Servers see messages with random sender and recipient addresses, but those can not be mapped to a phone number or public handle. Servers see IP addresses. But you can use Tor, or a VPN, if you want to hide that. It' not all bad :)
PSA We are happy about the wealth of privacy focused classic email providers (proton, tutanota, posteo, mailbox.org etc) but they are not geared for instant secure messaging. Do yourself, family and friends a favor and use delta with any of the many
Chatmail: Relays
Chatmail provides FOSS infrastructure for interoperable, secure, speedy and reliable end-to-end encrypted messaging. Check out clients as Arcane C...
 Or setup a relay of your own if you feel like it. Or use a a dedicated chat email address on your own or any classic email server that has reliable service and no obnoxious rate limits or annoying spam handling. Cheers.
Our stance simplified: we want to make private communications available to anyone on the planet. Problem: governments everywhere tend to want to control and contain private communications. While Iran and Russia might be contemporary poster examples trying to control private communication, almost all of the "Western" countries have similar control-tendencies, EU Chatcontrol, UK Online Safety Act, US KOSA etc.pp. And we often call those out. Without private communication, things are bleak.
Abdanan, January 7th 2026. A 40K people city in Iranian mountains where people took over all police and government buildings, as far as we gather. Internet blockades are happening intermittently in various forms. There is a massive sense of uncertainty and panic, also from the government side. We hear of many people succeeding in using #deltachat and #chatmail relays, and are trying, to the best of our abilities, to help people set up communications so families and friends can stay safe. image