New in 1.4: your own Cardio Fitness • Stressy now calculates your VO₂max itself, from the pace of your runs, walks, hikes and rides and how hard your heart worked, against your own maximum heart rate. Apple Watch's estimate reads low in independent lab studies, so Stressy doesn't show it. • See where you stand for your age and sex, your fitness age, the workouts it's from and every step of the math. • Fitness Test on Apple Watch: run as far as you can in 12 minutes, guided by taps on your wrist, for a fresh, firm value. • Body Age now uses your Cardio Fitness. • Workouts counted in full: sprints and stop-and-go sports count at their real effort, football or a run counts even without a workout started, and each workout shows what it cost after it ended. On the stress chart and widgets each workout shows in its own colour, with how hard your heart worked. • Nights, hour by hour: after a late night your sleep recharges with your heart, slowly while it's still racing and fully once it settles. The stress chart and widgets now show your night too. • Your day at a glance: the Today sheet shows your stress every 5 minutes behind your reserve, with your workouts in their own colours. • Steps on your wrist: the steps and distance complications on Apple Watch fill with Stressy's liquid toward your usual day. • Light or dark, your choice: Stressy follows your iPhone's appearance, or stays light or dark, in Settings. Your health data still never leaves your iPhone and Apple Watch.

New watch face complications: your reserve as a drop of Stressy's liquid, with its wave, bubbles and the number floating inside. The rectangular one adds a liquid capsule, your day so far and the trend. The corner gauge runs from red to teal, and the inline one shows a battery at your level. The Lock Screen widgets get the same look.

Sleep and Steps now open like Body Age: a moon and a walker made of liquid fill up as your time asleep and your steps count up, with a ruler that shows them against your sleep goal and your usual day. The story cards you share match the new design, and the sleep story shows the time in each stage.

Heart rate zones now match Apple's Workout app. They're set from your heart rate reserve, between your resting heart rate and the maximum for your age, the way Apple sets them, and each zone shows its heart rate range.

New: Body Age. See how old your fitness and habits look, from your cardio fitness, resting heart rate, steps and sleep, each compared with what's typical for your age and sex. Every step of the calculation is shown with the studies behind it, and you can share it as a story.

Made for iPhone Duo: open it, and your whole day sits beside your reserve, with every page opening next to your number. Also new: How Stressy works explains how your reserve is worked out, and Why under the bedtime coach shows its suggestion step by step.

See how your reserve is worked out: a new How Stressy works page (Settings, or How it works next to Behind the number) explains how sleep fills it and the day drains it. And tap Why under the bedtime coach to see its suggestion step by step: your evening, falling asleep, the night's recharge and your usual wake-up.

After midnight Stressy now moves straight on to the new day, even when it stayed open in the background. Steps and distance match the Health app's own totals.

Steps and distance now match the Health app exactly: Stressy counts each day the way Health does, with your iPhone and Apple Watch merged once. The last 7 days use the same totals.

New in 1.1 • Steps and distance, hour by hour and across the week, with new Steps and Distance widgets • Sleep stages: deep, core and REM through the night, and how your body recovered • Workouts: the route on a map, pace, heart rate zones and what each one cost your reserve • Share your steps, sleep or a workout as a story video or image, made on your iPhone Your health data still never leaves your iPhone and Apple Watch.

Stressy now runs on iOS 26 and watchOS 26, so even more iPhones and Apple Watches can show your reserve. Background updates also stay smooth on every version.

More precise mornings. Your reserve now recharges overnight the way your body does: quickly after a draining evening and more gently as it nears full, so a great night wakes you in the high 80s and one unusual reading asleep can't inflate your morning.