Whoop vs Garmin Cirqa vs Fitbit Air vs Amazfit Helio Strap: The Screenless Band Fight Is Really About Money

For most of a decade, Whoop had the screenless strap category to itself. If you wanted 24/7 heart rate, HRV, and recovery scores without a display nagging you, there was exactly one place to go — and you paid rent to be there. Then the copycats arrived all at once: Amazfit's Helio Strap in 2025, and this year both the Garmin Cirqa and Google's Fitbit Air. Same silhouette, same pitch, no membership required.

Here's what makes this comparison unusual: the hardware has nearly converged. All four are fabric bands between 12 and 24 grams. All four read heart rate around the clock, track HRV overnight, stage your sleep, estimate VO₂ max, and score your recovery each morning. None of them has a screen, onboard GPS, or any smartwatch feature whatsoever. What has not converged is what you pay — the spread runs from $99 once to over a thousand dollars across three years. So this isn't really a spec fight. It's a fight about whether analytics are worth a subscription, and each company answers differently.

The Spec Sheet, All Four at Once

Cost over 3 years combines hardware and subscription across 36 months. Whoop's figure is entirely membership fees, and they're mandatory — stop paying and the strap stops working. The other three all work fully subscription-free: Garmin's optional Connect+ and Amazfit's optional Zepp Aura add AI insights and wellness content on top of complete metrics, and the Fitbit Air only needs Premium for its AI coaching. Weights are for the complete band — the sensor modules alone are lighter, at 5.2 g on the Air and 14.8 g on the Cirqa. HR sampling is the interval between readings: manufacturers publish their workout rates, but describe off-workout sampling only loosely. Green marks the best in a row, shared when it's a tie.

Full sensor-by-sensor detail lives on the individual pages — Whoop 5, Garmin Cirqa, Fitbit Air, and Amazfit Helio Strap — and you can line any of them up against a watch or ring in the wearables comparison tool.

Two rows in that table do most of the deciding. The cost row is a 10x spread for devices that look nearly identical on paper. And the water resistance row is the one place Whoop trails the whole field: a 1 ATM rating against 5 ATM across the other three.

The Part the Table Can't Show: Analytics Quality

A screenless band is only as good as the app that interprets it, because the app is the entire product. This is where the four genuinely separate.

Whoop still has the best analytics layer, full stop. Strain and Recovery remain the most actionable daily training signals any passive wearable produces, and Whoop's sleep and HRV measurements have held up well in validation work against polysomnography and ECG (Miller et al., 2020; Bellenger et al., 2021). The subscription buys polish, coaching, and a decade of algorithm refinement. Whether that's worth $199–$359 every year is the entire question.

Garmin didn't build a new app — it pointed the Cirqa at Garmin Connect. That's the smartest move in this category. The Cirqa's Elevate sensor feeds the exact metrics Garmin's watches produce: Body Battery, HRV Status, Training Readiness, VO₂ max, and full sleep coaching. If you've ever used a Garmin watch, you already know the ecosystem; if you train with structure — the kind of zone-based work covered in our heart rate training zones guide — this is the deepest analytics stack here that doesn't require a subscription. Garmin does sell an optional Connect+ tier ($6.99/month) with AI-generated insights, but every metric named above is included free.

Fitbit Air is playing a different game entirely. Google is betting the analytics on its Health Coach AI, which comes with a three-month Premium trial and then sits behind $9.99/month. What the Air uniquely offers is AFib detection at no extra cost — Whoop matches it only on the $359/yr Life tier, with its MG hardware — and a multi-device setup designed to let you wear a Pixel Watch by day and the Air to sleep. It's the pick for general health monitoring, not training.

The Helio Strap is the value play with rough edges. The hardware is legitimately good — accurate optical heart rate, and it broadcasts HR over Bluetooth to Zwift, Peloton, or a bike computer, which none of the others do at this price. But BioCharge, Amazfit's answer to Whoop's recovery score, is less consistent day to day, and the auto-detection has a habit of logging workouts that never happened. You're getting 80% of the product for 10% of the three-year cost, and the missing 20% is trustworthiness of the daily score.

One caveat that applies to all four: wrist-based optical heart rate degrades during high-intensity and stop-start efforts (Gillinov et al., 2017). These bands are at their best measuring sleep, baselines, and steady aerobic work — treat their VO₂ max estimates as trend lines, not lab values.

Who Each One Is Actually For

Whoop 5 — the funded athlete

If you train hard most days, act on a daily recovery recommendation, and the price of a coaching subscription doesn't bother you, Whoop remains the category leader. The swappable battery pack means literally unbroken data — no charging gaps in your sleep history, ever. Its strain score is the commercial cousin of the training-load math coaches build from TRIMP — the training load calculator shows the open version. Just know you're renting: cancel, and you own a strap.

Garmin Cirqa — the trainer who's done with subscriptions

The Cirqa is the closest thing to Whoop-class training analytics you can buy outright. $199.99 once, the full Garmin metrics stack, 5 ATM, ten days of battery — and while Garmin offers the optional Connect+ tier for AI insights, nothing in the training stack sits behind it. It's also the obvious sleep-and-recovery companion if a big watch on the nightstand is why your sleep data has gaps. The trade-offs are Garmin-typical: a proprietary charging clip and an app built for athletes, not for casual browsing.

Fitbit Air — the health monitor

At $99, the Air is the cheapest way to get all-day HR, sleep staging, HRV, and AFib alerts on a wrist. If your questions are "am I sleeping enough, is my heart okay, am I moving enough" rather than "how hard should I train today," nothing else here justifies its price against it. Athletes get more than they used to — Daily Readiness, weekly cardio load, and a VO₂ max estimate all come subscription-free — but there's still nothing like Whoop's strain guidance or Garmin's structured training load here, so serious training lives elsewhere.

Amazfit Helio Strap — the experiment

$99.99, no required subscription (the optional Zepp Aura tier adds AI wellness advice, not core metrics), solid hardware, shakier software. It's the right pick if you want to find out whether you'd actually use recovery data before committing real money to Whoop or Garmin — or if the Bluetooth HR broadcast to your bike computer is the feature you came for. Worst case, you've spent one month of a Whoop Life membership finding out.

A Filter Before You Buy Any of Them

The screenless pitch — no notifications, no glancing at your wrist mid-conversation — is genuinely good, and it's why this category is growing while smartwatch sales flatten. But a band that only reports through an app demands something a watch doesn't: you have to actually open the app, and you have to know which numbers deserve attention. Sleep stages and morning HRV are approximations with real error bars (Chinoy et al., 2021; Plews et al., 2017); the value is in the trends, not any single Tuesday. Our guide to making sense of wearable data covers which signals are worth watching, and if sleep is the metric you're chasing, start with the fundamentals in the sleep optimization guide before paying anyone to score it — a sleep calculator and a consistent bedtime are still the highest-ROI intervention in this entire article.

And if you got this far still torn between two of them because one tracks workouts better and the other sleeps better — that's the strongest sign yet that what you actually want is a GPS watch, or a watch-plus-band combination. The full wearables catalog is the place to work that out. For the ring-shaped version of this same decision, we've already done the math in Oura Ring 4 vs Whoop 5.

References

1. Miller, D. J., Lastella, M., Scanlan, A. T., et al. (2020). "A validation study of the WHOOP strap against polysomnography to assess sleep." Journal of Sports Sciences, 38(22), 2631–2636.
2. Bellenger, C. R., Miller, D. J., Halson, S. L., Roach, G. D., & Sargent, C. (2021). "Wrist-based photoplethysmography assessment of heart rate and heart rate variability: Validation of WHOOP." Sensors, 21(10), 3571.
3. Chinoy, E. D., Cuellar, J. A., Huwa, K. E., et al. (2021). "Performance of seven consumer sleep-tracking devices compared with polysomnography." Sleep, 44(5), zsaa291.
4. Gillinov, S., Etiwy, M., Wang, R., et al. (2017). "Variable accuracy of wearable heart rate monitors during aerobic exercise." Medicine & Science in Sports & Exercise, 49(8), 1697–1703.
5. Plews, D. J., Scott, B., Altini, M., et al. (2017). "Comparison of heart-rate-variability recording with smartphone photoplethysmography, Polar H7 chest strap, and electrocardiography." International Journal of Sports Physiology and Performance, 12(10), 1324–1328.