Screen calculator
Physical size in cm, pixel density (PPI), dot pitch and aspect ratio from resolution and diagonal, with saveable screens for comparison.
OpenTools
Small utilities I use myself. Everything runs in your browser. Nothing is sent anywhere.
All tools
Schafkopf settlement
Works out who owes what after every hand of Bavarian Schafkopf: game types, tariff, Laufende, Schneider and the doublings, with a full rules reference and a beginner walkthrough. German by default, with an English option.
OpenWizard scorepad
Keeps score for the card game Wizard: bids and tricks per round, running standings, the full history, and a correction for any round you got wrong. German by default, with an English option.
OpenRegex playground
Build regular expressions from examples and building blocks, test them with live match highlighting, and get every part of the pattern explained in plain English.
Open