GRADE ยท Diary https://www.sofapps.it/grade/en/diary/ An occasional diary. Milestones, the problems that ate a week, and the measurements that proved me wrong. This is the story of this project. Stories for people who build, and for people who love to ride. en The number that was meant to tell you whether you are improving https://www.sofapps.it/grade/en/diary/il-numero-che-doveva-dirti-se-stai-migliorando/ https://www.sofapps.it/grade/en/diary/il-numero-che-doveva-dirti-se-stai-migliorando/ Fri, 25 Sep 2026 09:00:00 +0000 Building a single index that works for a beginner and for a professional is harder than it looks. Mine broke twice on a real user, and in the end the right answer was to remove it. The trainer told me forty-two revolutions per minute https://www.sofapps.it/grade/en/diary/il-rullo-mi-ha-detto-42-rpm/ https://www.sofapps.it/grade/en/diary/il-rullo-mi-ha-detto-42-rpm/ Fri, 11 Sep 2026 09:00:00 +0000 Indoor cycling apps are full of fixed numbers chosen by someone who did not know who would be pedalling. On a beginner, a fixed number is not imprecise: it is wrong, and sometimes it hurts. I built a fake trainer so I could build the real one https://www.sofapps.it/grade/en/diary/ho-costruito-un-rullo-finto/ https://www.sofapps.it/grade/en/diary/ho-costruito-un-rullo-finto/ Fri, 28 Aug 2026 09:00:00 +0000 How you build an app that talks to hardware, when the hardware is not there. A week reading papers before writing a single line https://www.sofapps.it/grade/en/diary/una-settimana-di-paper/ https://www.sofapps.it/grade/en/diary/una-settimana-di-paper/ Fri, 14 Aug 2026 09:00:00 +0000 The power needed to ride a bike has an equation, it dates from 1998, and you can reproduce it numerically to find out whether you understood it. On the difference between a law, a validated model and a convention.