❶ Install Delta Chat

iPhone/iPad
macOS
Source Code
Homebrew manual install: brew install --cask deltachat
Windows
Source CodeGet portable version (experimental)
Winget install: winget install 9PJTXX7HN3PK
GNU/Linux
Source Code
Flatpak manual install: flatpak install flathub chat.delta.desktop
Arch manual install: yay -S deltachat-desktop-git
Nix manual install: nix-env -f "<nixpkgs>" -iA deltachat-desktop
Snap manual install (community maintained): sudo snap install deltachat-desktop
Ubuntu Touch
Source Code
See blog for details about this community driven effort

❷ Get an Account

You can use (almost) any email account with Delta Chat. If you need a new one, tap or scan this QR code to get a random @nine.testrun.org email address:

❸ Enter a Username and Meet Your Friends

Now you can enter a username, select a profile picture, and chat with your friends. The best way is to meet them and verify them by scanning QR codes.

An iOS user scanning a QR code on someone else's phone.

Changelogs

The desktop versions do not require Delta Chat to be installed on a phone.

Minimal requirements: Android 4.1 Jelly Bean or iOS 12, iPhone 5s or iPad 5/Air/Mini 2 or Windows 7, macOS 10.11 El Capitan, Ubuntu 18.04, Fedora 29 or Debian 10 or compatible systems.

Preview Builds

Preview builds may come with new bugs and should not be used productive.