The Sandbox

Play the app as yourself, one day at a time. Enter your profile, do your daily check-in, see the workout and the food the engine prescribes, log how it actually went — and watch all five engines react, inputs and outputs. Scrub back to any day for its full engine X-ray; fork the timeline to compare decision paths. Everything replays deterministically on the real engine; your run saves locally. This is the acceptance-test surface before the app gets built on top.