Cat that kicks an exclamation mark.
Hardware of a Free Design
Transparent. No Tricks. No Compromises.


Zerocat is run by Kai Mertens, who is supported by friends and pioneer customers.

For questions or feedback, feel free to get in touch with any fellow as listed below.

If you need to see a tool come true, which does not yet exist as free-design hardware, we would love to hear about it.

Want to join the team? Get in touch, but please be aware that we expect you to be a reliable team member, carrying our Philosophy at heart.

Software that we use for Communication

We are using Tox with uTox and qTox.
Our Tox IDs are provided on this page.

[...] Tox is a distributed and secure instant messenger with audio and video chat capabilities. — GNU Guix uTox Package Description

In addition, we can offer communication via Jami Communication Software upon request. Our Jami IDs are provided on this page.

Jami is a secure and distributed voice, video and chat communication platform that requires no centralized server and leaves the power of privacy in the hands of the user. It supports the SIP and IAX protocols, as well as decentralized calling using P2P-DHT. — GNU Guix Package Description

We are using the GNU Privacy Guard in conjunction with email.
Public OpenPGP keys are available for download from this page.
See OpenPGP for more details.

The GNU Privacy Guard is a complete implementation of the OpenPGP standard. It is used to encrypt and sign data and communication. [...] — GNU Guix Package Description