Method and measurement

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How Tensile decides what is worth telling you. Mostly this is about what gets thrown away: the arithmetic of testing many things at once, and why an app that reports everything it finds is not doing you a favour.

2 August 20268 min readStatistics

Are your fitness app's insights real?

On 300 simulated runs of pure noise, 35% produced a finding that passed an ordinary significance test. The multiple comparisons problem, measured on our own engine, and the three questions worth asking of anything that shows you a pattern.

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We tested 13 ideas about you. 11 did not hold up.

Tensile reads back years of Apple Watch data you already recorded, then tells you the few things that survived the check. Now in open beta on iOS.

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Wellness insights, not a medical device. Never sold, never used for ads.