Engineering and product notes from the two Bein apps.https://bein.ltd/en-gbhttps://bein.ltd/blog/a-portable-format-for-food-diarieshttps://bein.ltd/blog/a-portable-format-for-food-diariesYears of logging is the least portable data most people own, and the main reason nobody switches trackers. So we wrote a specification and put it in the public domain.Sat, 19 Sep 2026 00:00:00 GMThttps://bein.ltd/blog/why-the-ai-runs-on-your-phonehttps://bein.ltd/blog/why-the-ai-runs-on-your-phoneA food diary is a more revealing document than most people realise. Not holding it turned out to be a design constraint that shaped both apps, and it cost more than it sounds.Mon, 07 Sep 2026 00:00:00 GMThttps://bein.ltd/blog/how-burnin-measures-your-metabolic-ratehttps://bein.ltd/blog/how-burnin-measures-your-metabolic-rateMost trackers guess your maintenance calories from a formula, then blame you when the scale disagrees. Burnin waits for evidence and does subtraction instead.Tue, 01 Sep 2026 00:00:00 GMT