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En Passant

En Passant brings you the game of chess in a clean and attractive way.

Artwork designed by Michael Dolejs

Papers 3

Papers 3 helps you collect and curate the research material that you're passionate about.

Helped the wonderful developers at Mekentosj


The portable virtual station for the BART San Francisco metro.

Made for and designed by
Hammink Design


Railway departure times for The Netherlands

Made for and designed by
Hammink Design

Railway NL

Railway planner for The Netherlands

Made for and designed by
Hammink Design

Good Move

Measures your mobility-related carbon emission

In collaboration with Taco Ekkel & Niels Bartels


Grades app for University Leiden

Loved but unofficial


Push notifications as reminders for borrowed books of libraries in The Netherlands

My first app in the Store


Measure your golden handshake, written for Dutch law system

Design by Hammink Design
Made for Hotlines bv

Background Piano

Play piano on your iPad with your keyboard plugged into the Camera Connection Kit while using other apps.

TRC Pharmacology

Provides basic pharmacological knowledge: pharmacodynamics, pharmacokinetics, and drug mechanisms.

Icon & content by LUMC


Dutch election results on a map

Design by SWIS


City guide of Leiden

Design by SWIS
Not available anymore

G-Star RAW

The G-Star RAW Magazine for iPad.

As a freelancer for IceMobile

Hi, I study Medicine and develop applications for iOS.

Searching on PubMed? Try my PubMed query-editor

Developing an app? Check out my Github profile for useful open-source projects.