Blog

How any of this actually works.

Engineering and product notes, written when there is something real to report rather than on a schedule.

  • Onyx, a portable format for food diaries

    3 min read

    Years 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.

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  • Why the AI runs on your phone

    4 min read

    A 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.

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  • How Burnin measures your metabolic rate

    3 min read

    Most trackers guess your maintenance calories from a formula, then blame you when the scale disagrees. Burnin waits for evidence and does subtraction instead.

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