Person sitzt vor zwei Monitoren mit dem Rücken zur Kamera

The experts for free and secure communication

How we think

For us, enabling secure and free communication is not an empty phrase but at the core of what drives and motivates us.

Who we are


OpenTalk has been developed by the Berlin-based company Heinlein Support, with 30 years of experience in the design and operation of secure electronic communication. Know-how and passion for open source unite our team. Transparency and integrity are our shared values. Data protection and digital sovereignty are the essence of our DNA.

What does that mean for you? We are partners on an equal footing and will make your goals our own. What began as a project for the city of Berlin with the development of a city-wide video conferencing platform has now led to the development of OpenTalk, a solution that provides what businesses, political organizations, authorities and schools need.

Our Background

Heinlein Support GmbH

The mother ship with more than 60 employees. We are Linux and open source experts and operate our own data centers. We also provide 24/7 support for other administrators. We design customized solutions, offer honest advice, and practical hands-on help.
E-mail, cloud solutions and hosting that uses the latest security standards, powered by green energy. This is how secure and free communication works for businesses, private individuals, and also many teachers and educational institutions. was founded in 2014 and has won multiple awards since.

Portrait von Dennis Kalbhen

„Good communication starts with open communication and independence. That's exactly how we developed OpenTalk: as a secure alternative to other video conferencing solutions and for true data autonomy.“

Dennis Kalbhen,
Project lead at OpenTalk