LifeTrends: Health Insights

You walk more on weekends. You climb more stairs in June. You sleep less on Sunday nights. Those are findings, not guesses. LifeTrends reads the health history already sitting on your iPhone and tells you, in plain English, what is actually in it. Then it shows you the numbers behind every claim. No score out of 100. No streaks. No coaching voice. Just findings you can check. Most health apps show you yesterday. LifeTrends shows you the shape of your life so far. WHAT IT FINDS, IN PLAIN ENGLISH Alongside the three above: "Your resting heart rate rises with your weight." "You lose weight during summer." "You walk more when you visit New York." "You slept less and earlier after New York (jet lag?)." Behind sentences like those: weekday against weekend, month by month and season by season across your entire history, your daily rhythm hour by hour, relationships between one metric and another, record days tagged with where you were, the cities you move more in, and what crossing time zones does to your sleep. NOTHING APPEARS UNLESS THE STATISTICS HOLD This is the part most apps skip. LifeTrends runs on-device regression using Apple's CreateML and keeps a finding only when the difference is both large enough to matter and unlikely to be chance, using a Welch t-test as the gate. A separate quadratic F-test hides the trend line when your data simply is not linear. When the evidence is thin you see nothing, rather than a confident-sounding number. Tap any finding to see the absolute gap, the sample sizes, and whether it still holds this year. TRIPS AND PLACES, FROM PHOTO DATES ALONE LifeTrends reads photo metadata only: the date and the coordinate. Never the picture itself. Coordinates are matched against a list of roughly 250 cities built into the app, so no map service is contacted. That is how it works out your home base and your trips, and how it can tell you things like how much more you walked in New York, or that you slept less and earlier for days after you flew home. WHAT IT READS FROM HEALTH Steps, walking and running distance, flights climbed, exercise minutes, active energy, dietary calories, resting heart rate, heart rate variability, respiratory rate, blood oxygen, blood pressure, weight, body fat, time in daylight, sleep duration, fall-asleep time and wake-up time. Plus photo dates and coordinates, if you allow photo access. WHAT YOU NEED An iPhone on its own gives you steps, distance, stairs, daily rhythm, record days and everything location-based. An Apple Watch or similar wearable adds heart, sleep, exercise and daylight trends. Weight needs a connected scale, blood pressure needs a connected monitor. The more history you have, the more there is to find. PRIVATE, BECAUSE IT NEVER LEAVES No account. No sign-up. No cloud. No analytics. No ads. No network calls. Your Health and photo data is read on your iPhone, analysed on your iPhone, and stays there. The single exception is spelled out inside the app: if you tap Current Location and you happen to be outside the built-in city list, the app looks up that one place. FREE, PLUS ONE OPTIONAL UNLOCK The Summary tab is free and covers your last two years. LifeTrends Pro is a one-time purchase, never a subscription, and adds the Statistics tab (every variable charted, plus correlation plots) along with analysis of your full history, however far back it goes. WHO BUILT IT LifeTrends was written by a working biophysicist at Yale, to be the honest version: no score out of 100, no invented readiness number, no advice you did not ask for. Just what your own data supports, and what it does not. LifeTrends is not a medical device. It describes patterns in measurements you have already recorded and is not a substitute for professional care. A statistical association is not a cause, and the app says so instead of pretending otherwise. Requires iOS 17 or later. iPhone only.