Apple Health vs dedicated biological age apps

Apple Health is the hub of health data on an iPhone. It collects readings from your phone, your Apple Watch, and other apps, and it keeps them on your device. So why would you want another app?

What Apple Health does well

• Collects everything in one place. Steps, heart rate, heart rate variability, sleep, workouts, weight, and data from connected apps.
• Shows trends. You can see how a metric changes over weeks and months.
• Keeps data private by default. Health data is stored on the device and shared with apps only when you allow it.
• Can import some clinical records in supported regions and with supported providers.

What it does not do

At the time of writing (September 2026), Apple Health does not compute a biological age from your blood test. It can store lab values, but it does not turn them into a single, repeatable score, and it does not check whether a lab report's units are safe to combine.

That is not a flaw. Apple Health is a data hub, not a scoring engine. Dedicated apps fill that gap.

What a dedicated biological age app adds

A good one reads from Apple Health instead of replacing it. It adds:

• A published scoring method. Delta uses PhenoAge (Levine 2018): nine routine blood markers plus your age, run through a fixed formula. We call the result Adaptive Age.
• Report import with checks. Add a blood report as a PDF or photo, confirm each value, and let the app reject units it does not recognise.
• Blood and wearables side by side. Your Adaptive Age sits next to the sleep, heart rate, and training data from Apple Health, so you can see what happened between two tests.
• A history of panels. Each new report adds a point to your trend.

Things to check before you pick one

• Does it ask for Apple Health access only for the data types it uses?
• Does it keep your data on your device, like Apple Health does?
• Does it need an account? Delta does not.
• Is the score deterministic? The same panel should give the same result every time.

Using both together

Keep Apple Health as your hub. Let your watch and apps feed it. Then use Delta to read from it and add what it does not compute: a blood-based biological age that you can track over years. You can read how the number is built in what adaptive age actually measures.

Delta is free on the App Store and Google Play. Get Delta.