Grandpa Notes vs 量尺 Ruler

Grandpa Notes is a simple note-taking app. It is free and open source, with no advertisements, in-app purchases or tracking. Your notes are stored as plain text in a straightforward folder structure. You can create notebooks locally or in iCloud. There is also an optional encryption layer that is compatible with Cryptomator.

Turn your phone screen into a real ruler — open it and start measuring. • No calibration: your device model is matched automatically • Four units side by side: cm, mm, inch, and cun • Input positioning: type a length and the ruler jumps to it • Draw to measure: draw any line and read its length instantly • Mini games: match-the-length and guess-the-length, solo or with friends • Two themes: hand-drawn and geek Fully offline. No ads. No data collected.