Clearday: Caffeine & Sleep

By Takumi Kanzaki on AppTrack Ninja.

Most caffeine apps tell you how much you've had. Clearday tells you what it's doing to your body. Using your Apple Watch data — sleep score, resting heart rate, and HRV — Clearday calculates your personal caffeine cutoff: the latest time you can have a drink without wrecking your sleep. — HOW IT WORKS Caffeine has a half-life of 5–6 hours. That afternoon coffee at 3pm still leaves 25mg in your bloodstream at 11pm — silently reducing deep sleep. Clearday models this in real time, overlays your HealthKit data, and tells you exactly where your cutoff is. No guesswork. Just your data. — WHAT YOU …

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