There are of course a large number of native apps (for iOS and Android) available that already allow you to track scores.
However, they all suffer from a fundamental shortcoming: it's very hard to share and collaborate. Most of these apps only allow a data dump, which means that colloboration is actually impossible.
Sharing on the web, however, is extremely easy: you just share a URL. So this webapp was made on the assumption that users want to share their scores!
Created by Caspar von Wrede.