Hume watches your recovery, heart resilience and metabolic signals together. When they move away from your normal in an unusual way, the app lets you know your body may be carrying strain it usually doesn't.

Treat it as a nudge. It points at a change you might have missed and gives you a concrete reason to talk to your doctor sooner. Hume doesn't diagnose anything, and it doesn't replace medical care. In the Zepp App, the Helio Strap can alert you when your heart rate or SpO₂ crosses a limit you choose, and it offers smart health alerts once you switch them on.

Why this matters: checking you against your own baseline every day gives you more chances to notice a change and ask your doctor about it.

Biological age is the figure most people actually want to know. Two 50-year-olds can be aging at very different rates, and their birthdays won't show it.

Hume's Metabolic Momentum follows your pace of aging in real time and shows whether your daily habits are adding years or taking them away.

Hume Band 2.0 shows your Biological Age and Pace of Aging in the app, so you can compare how your body is aging with your calendar age.

Pace of Aging is the one to check week to week. It tells you whether recent habits have your clock running faster or slower than one year per year, so you can change course while the trend is still young.

The Helio Strap scores your sleep, rates your energy with BioCharge and logs your training each day. Amazfit lists no biological-age or pace-of-aging score for it.

Why this matters: a number that adds your habits up over months gives you something concrete to act on, week after week.

Both straps read your heart rate around the clock and your HRV overnight. The Helio Strap logs heart rate every second, which works out to 86,400 readings a day.

Hume Band 2.0 turns heart rate, HRV and recovery into a heart resilience trend, a read on how well your body bounces back from stress, followed across months.

HRV is the small variation in time between heartbeats. It reflects how easily your body moves between stress and recovery.

Followed over a season, a rising or falling resilience trend says more about your heart fitness than any single resting reading.

The Helio Strap puts its heart data to work for training: PAI, heart-rate recovery, VO₂ max, training load and recovery time. Those tell you whether you are ready to push today.

Why this matters: a year of heart data shows which way your fitness is heading, and Hume charts that direction for you.

Blood oxygen and skin temperature are quiet signals. Overnight SpO₂ can dip at altitude or with restless breathing, and a run of low readings is worth raising with your doctor.

Skin temperature moves with your body too. It can shift through a menstrual cycle or stay raised after a hard training week.

The value comes from repetition. Once the band has learned your normal, it can show you when you drift away from it.

Hume Band 2.0 tracks SpO₂ and skin temperature continuously as core metrics.

The Helio Strap measures SpO₂ (24-hour tracking has to be switched on in the Zepp App) and rates your sleep breathing quality. Amazfit lists a temperature sensor, but skin temperature isn't among the Helio Strap's health features.

Why this matters: these two signals show how your body is doing underneath the training, and a band that follows them every day can point you to a change worth asking about.

Blood pressure is one of the most useful numbers to know, and most people see it a few times a year at best. Hume Band 2.0 now gives you blood-pressure insights from your wrist, with nothing to inflate.

The app shows how your blood pressure shifts across days and habits, so you can see what a run of short nights or a stressful week does to it.

The Helio Strap has no blood-pressure feature. Its health features cover heart rate, SpO₂, stress, sleep, BioCharge, PAI and heart-rate recovery.

Why this matters: treat these as trends to watch. If yours creep upward, book a proper cuff reading with your doctor.

The Helio Strap wins on price and training tools. Hume Band 2.0 wins on battery, charging speed and health depth: metabolic scores, biological age, blood-pressure trends and a heart trend, all free in the app.

Amazfit rates the Helio Strap at up to 10 days of typical use. Hume rates Band 2.0 at up to 14.

Hume quotes about 30 minutes for a full charge (20 to 80 minutes, depending on how low the battery is). Amazfit lists under 2 hours to fill the Helio Strap from empty.

Hume reads heart rate, HRV, SpO2 and skin temperature through the day and night, and Premium adds an AI Health Coach built on Claude.

Those continuous reads feed Metabolic Capacity, the heart resilience trend and Biological Age, scores Amazfit doesn't list for the Helio Strap. The Helio Strap spends its effort on training: heart rate every second, live broadcast to your watch or treadmill, and recognizing 25 strength movements.

Give it two years and both straps will have logged hundreds of nights. The Zepp App turns that history into fitness trends, PAI and recovery times.

After two years, Hume shows how your Biological Age has moved.

If your week is built around lifting, HYROX prep or interval sessions, the Helio Strap is a smart buy at $99.99. It weighs 20 g, logs heart rate every second, counts your strength reps and asks for no subscription. As a training strap, I'd recommend it.

If what keeps you up at night is whether your metabolism is slowing, where your blood pressure is heading and how fast you are aging, the Helio Strap has no score for any of it. Hume Band 2.0 reads those questions from the same kind of optical sensor and answers them in a free app:

✅ Metabolic Capacity

✅ Metabolic Momentum

✅ Unusual-strain alerts

✅ Biological Age

✅ Pace of Aging

✅ Blood-pressure trends

✅ Health Score from many biomarkers

✅ Continuous SpO2

✅ Skin-temperature trend

All tracked in the free app.