HeartStress: HRV & Heart Rate

Your heart rate tells a story. HeartStress helps you read it — on device, no account.

Read your heart rate. Notice changes early. Take better care of yourself.

HeartStress turns Apple Watch heart rate data — especially resting heart rate trends — into a clear daily score, so shifts from your personal normal are easier to spot in plain language, every day.

WHY I BUILT THIS I am a developer and a long-time Apple Watch user. In 2024, resting heart rate trends and high-heart-rate alerts on my Apple Watch caught my attention — my numbers had been drifting from my usual range for days. I went to the hospital and was later found to have hyperthyroidism.

That was not a conclusion from a watch or an app. It was a persistent pattern in my heart rate data that told me to take my body's signals seriously. Since then I have paid much closer attention to heart rate, and I have wanted a clearer, more accessible way to notice unusual patterns earlier. HeartStress is that tool.

HOW IT CAN HELP YOU · After a run of late nights, your score shows higher-than-usual load — a quiet reminder that rest matters more than one more hour of work. · On a high-pressure day, seeing your resting heart rate sit above your normal range makes it easier to decide: push through, or pull back? · After a week of better sleep, your trend chart shows heart rate settling back toward your baseline — a small win that is easy to miss otherwise. · Check the complication on your watch face any time: one glance shows where today sits relative to your own normal.

WHAT HEARTSTRESS TRACKS Wear your Apple Watch as usual. HeartStress reads resting heart rate, nighttime heart rate, HRV, sleep, and activity from Apple Health, then combines them into one daily Heart Stress Score (0–100) with a plain-language summary of how today compares to your personal baseline.

· Resting and nighttime heart rate trends vs your personal baseline · Daily Heart Stress Score with a warm, easy-to-read summary · The signals behind the score — not just a number with no explanation · 7 / 30 / 90-day trends across heart rate, HRV, sleep, and activity · Gentle alerts when high load or under-recovery keeps showing up · Shareable PDF reports with key days, heart-rate drivers, and recovery notes · Apple Watch app and complications to check your score at a glance

YOUR NORMAL, NOT A GENERIC AVERAGE Everyone has their own heart rate rhythm. HeartStress builds a personal baseline from your history. The question it asks every day is "how does today compare to your usual self" — not a one-size-fits-all benchmark.

PRIVATE BY DESIGN All health data is processed on your device. No account. No sign-in.

HeartStress is for everyday wellness awareness and recovery. It is not a medical device and does not provide medical advice. If you feel unwell or notice a lasting unusual pattern, please consult a professional.

SUBSCRIPTIONS AND IN-APP PURCHASES HeartStress Pro is available through monthly or yearly auto-renewable subscriptions, or as a one-time lifetime purchase. Payment is charged to your Apple Account after confirmation. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. You can manage or cancel subscriptions in your Apple Account settings.

Privacy Policy: https://heartstressapp.com/privacy Terms of Use: https://heartstressapp.com/terms