S42

Apps for your private cloud.

Email, calendar, files, talk, and more. Built from the ground up with tight integration.

See what’s included Install now

The suite

Seamless together, with single sign-on.

They ship together as one workplace.

Contacts
Calendar
Mail
Talk
VPN
Notes
Files
Passwords
Sites
Forms
Office

The gap

Self-hosted shouldn’t mean second-class.

For years, the office suite has been a SaaS stronghold. Self-hosted alternatives rarely match that polish, and they target enterprise. This leaves everyone else stuck with big tech.

What’s with the name

A circle of apps.

The name began as a nod to Berlin’s S42 Ringbahn: a loop that holds the city together. S42 is our circle of apps. Another reading: S for Simple, Solid, Smart, Secure, Seamless, Sovereign. And 42 is the answer to life’s office-suite problems.

Simple Solid Smart Secure Seamless Sovereign

Install

Install S42.

Built by the Cloudron team on Cloudron, so install, updates, and day-to-day maintenance stay simple.

Three commands and the full suite is up. 

wget https://cloudron.io/cloudron-setup
chmod +x ./cloudron-setup
./cloudron-setup --edition s42

Create a fresh Ubuntu Noble 24.04 x64 server. A domain is required. The server must have at least 2GB RAM and 20GB disk space.