Started for a neighbor’s mother.
Calendar Clock was created by Teun Kortekaas of Jelter B.V. No investors, no ads. This is the story.
I always loved programming, and at seventeen I was looking for my first app to truly publish. While visiting a neighbor, he told me his mother had dementia. He thought it was ridiculous to pay hundreds of euros for a dementia day clock, and asked whether I could build something that did the same thing.
After the first simple version, the emails started coming in: requests, ideas, improvements. Together with users, Calendar Clock has grown into the most complete and user-friendly dementia day clock available. I never imagined I would still be working on it years later.
Every day I receive messages from people sharing how the app helps them. That is my biggest motivation to keep going. The app now exists in 26 languages, thanks to users too: they translated it themselves.
Teun Kortekaas
Founder and developer, Jelter B.V.
2019
the beginning, as Teun’s first app
20,000+
people use it every day
26
languages, translated by users
0
ads, now and in the future
What we stand for
Four promises
Free forever
Everyone deserves the chance to live independently for longer, regardless of what they can afford. The core app is and will remain free.
No ads, no data selling
What appears on the clock belongs to you and your family. We only earn money through Premium.
Built with users
Every feature exists because a user asked for it. Every translation was created by a user.
Works on older devices
A ten-year-old tablet is good enough. No new hardware needed.
A better day, for everyone
Calendar Clock improves daily life for people with cognitive challenges and for the people who care for them. With technology no one needs to learn.
Questions or an idea?
Teun reads every email personally. Send a message by email or through the Admin app.