Over 10 million downloads worldwide.
Games that bring people together – on the go, at school and at weddings.

Downloaded by over 10 million users. Top chart positions. Featured by Apple.

One of the top geography e-learning apps to learn countries, capitals, states, cities and much more with a scientifically proven algorithm. With the integrated online multiplayer, you can play with your friends all over the world. Learn more
Download and try for free. Available on iOS and Android.
One question, a board full of answers. Type the most common ones before time runs out and beat your opponent.
Challenge a friend with a link or get matched with an opponent. A duel has three rounds, and you play your turn whenever you have time. Three wrong answers end your round.
Free for iPhone. In German, for Germany, Austria and Switzerland.
Coming soon to the App Store


Shoe Game, Survey Says and Couple Quiz – live on phones and the big screen. Every guest plays, no app needed.
Set up in 5 minutes. Guests' photos go up on the photo wall all evening.
Launching for the 2027 wedding season. Join the waitlist now for 20% off at launch.
Join the waitlistI began developing iPhone apps shortly after Apple launched the App Store, dedicating most of my weekends and evenings to experimenting with new app ideas. The first version of Where is that? was released in early 2012 and quickly topped the German App Store charts. Six months later, I left my full-time job in investment banking to pursue my passion as an indie app developer.
The app evolved into a comprehensive learning platform and multiplayer geography game. I developed a custom mapping engine optimized for gaming, which now powers all of my geography games. Where is that? has achieved numerous top chart positions worldwide, been prominently featured by Apple, and its kids version was a certified learning app in multiple countries.
My software development journey began in 1998 when I created and operated a homepage builder with 25,000 users and worked part-time at SAP during high school. While studying business administration at university, I gained valuable experience in investment banking with Dresdner Kleinwort, Goldman Sachs, and Commerzbank.
Ultimately, I chose to follow my passion for creating exceptional products for users around the world. Feel free to reach out if you are interested in any of my apps or would like to utilize my technology for a custom project.
Developed over 12 years and tested in apps used by millions of users
No internet connection necessary, available everywhere
Define country colors, border lines, terrain, ocean details, ...
Ask about licensing