The Best Paid Health & Fitness iOS Apps to Try in 2026
BMI, or body mass index, has been a standard measure of body composition for decades, though it is not without its limitations. It simply divides weight by the square of height, and while it does not distinguish between muscle and fat, it remains a useful starting point for most people. The apps below each offer a different approach to tracking health, from the familiar to the more specialised.
BMI Mate
BMI Mate is a straightforward calculator that does not require an account or sign-up. It works entirely on your device, so your data stays where it belongs. The interface centres around a colour dial that displays your BMI in green, yellow, or red, giving you an immediate visual read. You can switch between metric and imperial units with a single tap, and the app handles the conversion internally.
The free version provides the core calculation, while a subscription unlocks additional tools. These include goal tracking for your weight over time, a BMR calculator for your basal metabolic rate, and a waist-to-height calculator. You can also choose from several theme palettes to customise the look of the app.
Aura: Breathe & Sleep
Aura is a breathing companion designed to help you relax, focus, and fall asleep. It presents a calm, minimal interface that guides you through breathing exercises without overwhelming you with options. The app is free to use, with a Pro upgrade available as either a one-time purchase or a subscription that unlocks every feature. There are no ads and no tracking, which keeps the experience clean.
It is the kind of app you can keep on your home screen and open when you need a few minutes to breathe. It works well for people who want guided breathing without committing to a long-term subscription, since the one-time upgrade option exists.
Feed Tracker
Feed Tracker is built for new parents who need to track their baby's feeds with minimal effort. The core operation is simple: tap to start a feed, tap to stop. The app then shows you the gap since your last feed, today's feed count, and a colour-coded timeline of recent feeds. The design is deliberately simple, with large buttons that work well in low light and with one hand.
The free version shows today's feeds and the time since your last feed. A subscription unlocks a seven-day timeline, your average gap between feeds, and CSV export for sharing with your paediatrician. It also removes ads. For parents who are running on minimal sleep, the one-thumb operation is a genuine benefit.
Body Measurements
Body Measurements is currently in development, and it addresses a gap that the scale alone does not fill. Weight can fluctuate day to day, and the number on the scale does not always reflect changes in your waist, chest, or arms. This app lets you track those measurements over time and see the progress that the scale misses.
You can track waist, chest, arms, hips, thighs, and any custom measurement you choose. Each entry shows the latest value and the change since your last entry. The free version lets you track up to three measurements with their latest values. A subscription unlocks unlimited measurement types, full history charts for every measurement, centimeters or inches, and data export.
Breath Box
Breath Box offers guided breathing with a pulsing orb that guides your inhales and exhales. It includes five patterns: Box, 4-7-8, Coherent, Triangle, and Energise. The Box pattern is available in the free version, while the other four require a subscription. Sessions are sixty seconds long, and the app does not require you to count — the orb does the work for you.
The interface is minimal and works offline. You tap once to start, and the pulsing orb guides your breathing for the duration of the session. It is designed for people who want a quick breathing break, whether they are students, knowledge workers, or simply dealing with anxious moments during the day.