App developer passionate
about creating great products.

My Own Apps


I created this app just because I needed it.

I like to travel with friends and it was always a big mess after each trip to find out who owes whom how much. One paid for the flights, the other one booked the hotel. We ended up having complicated spreadsheets that helped us to come along with this problem.

With Splittr these problems are gone. You just enter an expense and define who paid and who benefited. Thats it. After the trip you can send a complete PDF Report to your friends.

My life became easier. And apparently the lifes of the 200,000+ people who downloaded Splittr too.

Like with all my own apps I was responsible for the strategy, conception, design, programming and marketing.

Watch a 50 second video of Splittr in action!
Stay updated and follow Splittr at Twitter! @splittr-app


IntelliDrink was born as a crazy idea on a party. After some research I found out that there was no sophisticated BAC calculator on the market. I was digging through scientific papers about the absorption and metabolism of alcohol in the human body and developed a complex algorithm based on the Widmark formula that takes time into consideration.

The feedback was overwhelming. I became compliments from all over the world. From doctors, scientists and from social services that used the app for educational purposes.

"We used IntelliDrink for obtaining estimated BAC in a research project for the purpose of calibrating sophisticated data analysis software for autonomous transdermal alcohol sensors."
Dr. Gary Rosen, Professor of Mathematics, University of Southern California (USC)

With over 400,000 downloads in the last 3 years IntelliDrink is also my most succesful app.

Like with all my own apps I was responsible for the strategy, conception, design, programming and marketing.

Featured by Buzzfeed, CNN, Mandatory and many more.
Stay updated and follow IntelliDrink at Twitter! @intellidrink


Do you like perfectly boiled eggs?
I do. And I've seen some timer apps in the App Store but none of them met my expecations.

I found some interesting formulas, improved these findings with my own tests and created an optimized algorithm to calculate the cooking time considering all relevant factors.

With EggMaster you can adjust your yolk consistency continously, you can cook different eggs at the same time and the coolest function is that the app learns by your feedback. EggMaster improves with every egg!

Its my newest app but still has a growing user base of 140,000+.

Like with all my apps I was responsible for the strategy, conception, design, programming and marketing.


My first app on the App Store in 2010. Actually, it was just a test in the first place but became a simple and fun game in the end.

Just tap on the ball and try to keep it in the air. This is the concept of the game. Simple but apparently addicting.

I put a lot of effort in the three dimensional look of the ball and in the physics to create a realistic user experience.

The app was downloaded over 200,000 times. But its boom years are over and further development is currently not planned.

Like with all my apps I was responsible for the strategy, conception, design, programming and marketing.

Client Work


WunderCar is a ride sharing platform comparable to Uber or Lyft.

I joined WunderCar as the first engineer and developed the foundation of the iOS app. My colleague Lars joined the team too and we launched the first version another 2 months later!

Even though the app is very easy to use, the technical background is quite complex due to the realtime server communication and heavy use of GPS and push notifications.

WunderCar is currently growing at a fast pace in eastern europe cities.


Pypeline is a super simple sales tracking tool!

We started Pypeline as a side project, developed an iOS app, a web app and our own backend. The project is currently in beta phase.

My part is the iOS App and I love the look and feel of the pype change animation and the visualization of the metrics.

Here you can get some more informations about Pypeline.


I developed this iPad app for Mercedes-Benz together with Jung von Matt advertising agency in Hamburg. The app was part of the Mercedes A-Class advertising campaign.

Beside the standard showroom like contents, the app made heavy use of OpenGL particle and video effects which were fun to create but also hard to optimize for iPad 1 devices.

Tasty Tunes

I created this game together with Fosbury Luther Lindbergh advertising agency for Al Capone. I also consulted the client regarding the concept of the app.

The idea was to create a game for direct marketing purposes which was distributed with the Apple enterprise program.

The app is a rhythm based game where you have to tap on one of the two records according to 3 different 90 seconds music tracks.

I created this app with the Cocos2D framework and included 3D animations and OpenGL particle effects for a really nice user experience.


Gigalocal is a microjobbing platform which connects people offering and searching jobs based on geo locations.

I was asked to rebuild some parts of the app such as the main "Gig create" section.

Unfortunately this startup was not succesful and their service was shut down in 2012.

About Me


I'm Raphael! I'm an app developer from Hamburg in Germany.

I love creating great products and I love to code. I'm currently focussed on iOS and Swift but I have a general interest and understanding of coding, design and UX combined with an entrepreneurial attitude.

Tell me more about you!

Ok! Although I wrote my first lines of code back in '86 on a C64, my professional career began in '99 with Flash and ActionScript.

Watch a short video of some of my ActionScript based projects I have created.

In this time I discovered my passion for programming and especially for creating great user experiences. And I fell in love with algorithms and data. Visualizing data is still one of my favorite fields.

But the best satisfaction for me is when all this tech knowledge is used to create something awesome for people who don't know much about tech. Creating easy to use products that just feel great and help people.

In 2010 I switched over to the iOS platform, which dramatically changed the possibilities of creating and distributing products to the people. I started creating my own apps and I still enjoy developing for the iOS platform.

Today I'm available for interesting freelance projects in the iOS space when I'm not working on my own apps.

Let's create something awesome together!