This is my online playground where I publish small toys I build to learn about various technologies, or just for fun. I keep most of my experiments private, but some are good enough to publish them.


Experiments with bitcoin and other cryptocurrencies.


A simple minesweeper game using node.js and The game logic runs on the server, the browser only displays the data it gets from the server.

Find flickr page for image

With this small web-based application you can find the original flickr page if you only have an image link.
The application uses Ajax on all JavaScript-enabled browsers and degrades gracefully on others. As an exercise I also made the Ajax content crawlable and enabled Ajax history and deep links with the help of the jQuery hashchange plugin. Nowadays I would use pushState().

Best of SEO

This is a place where I collect various SEO-related information: Best of SEO.


This is a rhyme search engine. I wrote custom storage and retrieval methods to keep it fast. I also developed a German phonetic rhyme search based on scientific papers.

Screenshot/PDF for any website

This is an app I built with PhantomJS that generates screenshots from any URL you feed it: Website to PDF/Screenshot.