My name is Claus and tend to tinker on the web, write about all things Apple, or create iOS / macOS apps in Swift. If you have questions, please contact me!

Open Access Helper

Open Access Helper is a macOS / iOS App that makes finding legal Open Access copies of scientific research easy! It's based on the fabulous APIs from unpaywall.org and core.ac.uk

Learn more...

Tab Count

Tab Count is a Safari App Extension (macOS) with a simple mission, it'll show you how many Safari tabs & windows you have open. The app doesn't ask for any permissions and thus protects your privacy along the way.

Learn more...


Wayback is a Safari App Extension (macOS), which sets out to help you interact with the Internet Archive's Wayback Machine in the most effortless and seamless way possible.

Learn more...


If you travel for business, you might want to know the "Spesensatz" for a given location. This iOS app will geolocate you and lookup the correct Spesensatz, that your company (Germany) may reimburse you.

Learn more...

Find your Instagram ID?

A surprising amount of users come here to find out what their Instagram User-ID might be. While you shouldn't have to look here, you can click the button below to find...

Find your Instagram User-ID »

Your IP

One of the things I need to know a lot is my own IP Address and to that effect I use the power of PHP to help myself and possibly you. Care about your IP Address?

Here it is:

Need more IP details? »

Last Plane over Otzberg