Bike and Ride is an iOS app for managing (cargo) bikes. It enables the management of maintenance and inspection work (“checkbook”).
The app also offers route planning that combines train and cycle routes. For train connections, care is taken to ensure that cargo bike-friendly connections are selected. Deutsche Bahn interfaces are used for this purpose.
Smart Alarm was an innovative, self-designed alarm clock app for the iPhone - and one of the very first alarm clock apps in Apple's App Store.
It made it possible to wake up at a set interval (e.g. between 8:00 and 8:30 a.m.) depending on the sleep phase the user was in at the time and, if desired, also depending on the weather - for example, to set the alarm earlier in frosty weather because the commute to work might be longer.
I later stopped working on Smart Alarm due to time constraints.
I designed and implemented this app as the final project for my apprenticeship and later continued to maintain it privately. It was specially designed for blind and visually impaired users of public transportation and used Apple's VoiceOver technology to provide audio instructions for changing buses and trains during the journey.
This project required a high degree of user testing with the target group.
I later stopped working on the app due to time constraints.
In 2005, I founded my website simple-dev.org as a place where I offered self-developed mobile and web apps as well as German-language localizations of third-party apps.
In 2025, after 20 years, I decided to close the website due to time constraints.
PresActive was a web-based, rudimentary presentation app that is controlled exclusively by touchless gestures.
PresActive was developed as part of my final degree projects, in which I investigated how touchless gestures as a singular input method affect the design of the user interface, range of functions and scope of gestures, as well as user acceptance.
In this cooperation project between university and industry, the concept and prototype of a gesture-controlled user interface oriented towards typical workflows for controlling so-called extrusion industrial machines was developed.
I was involved in all phases of the project - in determining the requirements and implementing and approving a corresponding solution.
ApfelBlatt is a former web magazine about Apple products and services. I completely designed and implemented the magazine's official iOS app (with separate design concepts for smartphone and tablet).
Ongoing consultation with the client and feedback from ApfelBlatt readers resulted in a solution with high user acceptance.