Kulan OS
A calm, secure desktop that just works.
Kulan OS is a free desktop built on Debian 13. Signed updates, disk encryption, a private built-in assistant and a simple installer, ready the moment you turn it on.
Free · PC and ARM versions · No account needed
Everything you need, nothing you don’t
Built for home, school and small business computers.
Secure by default
Signed updates, a firewall, full-disk encryption and compliance mode, checked against CIS and NIST.
Kulan Assistant
Private and on your computer. Writing tools for any app, and “Do it for me” to change settings in plain words.
Widgets and a clean desktop
Weather, calendar, clock, to-do list, now playing and system status, arranged the way you like.
One simple Settings app
Wi-Fi, screens, sound, accounts, privacy and family controls, all in one place.
Kulan Fleet
Look after several computers from one place: health, updates and compliance.
Updates that look after themselves
New versions arrive through Software Update, with a restore point taken first.
Try it without changing anything
Kulan OS runs straight from a USB stick. Look around first, then install in about ten minutes, next to Windows if you like.