Polar Loop vs Amazfit Helio Strap: Pay Double for Less Data?

Both of these landed in 2025 as screen-light wearables aimed at people who don’t want a full smartwatch on their wrist. They take very different swings at the category, and the price gap is enormous — $199.99 for the Polar Loop, $99.99 for the Amazfit Helio Strap. Here’s how they actually stack up.

Key Differences

• Display: The Polar Loop is completely screen-free. The Amazfit Helio Strap has a 460 x 460 OLED display.
• Price: The Helio Strap launched at $99.99 — half the Polar Loop’s $199.99.
• Sensor stack: The Helio Strap adds SpO2, HRV, skin temperature, and a gyroscope. The Polar Loop sticks to optical HR (Precision Prime) and an accelerometer.
• Materials: The Polar Loop uses stainless steel with a textile wristband. The Helio Strap is fiber-reinforced polymer.
• Battery: Helio Strap claims 240 hours (10 days). Polar Loop claims 192 hours (8 days).
• Water rating: Helio Strap is 5 ATM. Polar Loop is WR30 (30m equivalent).
• Neither has GPS or NFC payments.

Deep Dive Comparison

Design & Comfort

The Polar Loop is the more grown-up object. Stainless steel housing, a textile band, and 29 grams on the wrist — it’s pitched as jewelry-adjacent, something you can wear with a button-down without looking like you’re tracking your last run. The Helio Strap is 20 grams of fiber-reinforced polymer with an OLED face. It’s lighter, more athletic-looking, and clearly meant to disappear during workouts and sleep, not show up at dinner.

If you’ve ever found Whoop’s all-fabric band slick when wet, the Helio Strap’s polymer body solves that. If you find Whoop too gym-coded, the Polar Loop is the only one of the two that passes for a bracelet.

Battery Life

The Helio Strap wins on paper — 240 hours versus 192 hours. That’s 10 days versus 8 days. Neither has GPS, so there’s no battery-killing satellite drain to worry about. In practice, both will get you a full work week and most of a weekend on one charge.

Health & Fitness Features

This is where the gap gets ugly for Polar. The Helio Strap’s sensor stack includes HR, SpO2, HRV, skin temperature, an accelerometer, a gyroscope, and a geomagnetic sensor. That’s the full recovery-band toolkit — sleep stages with blood oxygen, overnight HRV trends, temperature deviation from baseline. It’s clearly built to compete with Whoop and Oura on metrics, just without the subscription.

The Polar Loop runs Precision Prime optical HR and an accelerometer. That’s it. No SpO2, no HRV sensor, no temperature. What you’re paying for is Polar’s heart-rate algorithm reputation and the Polar Flow ecosystem, not breadth. If you don’t already trust Polar Flow more than the Zepp app, you’re paying double for fewer data points.

Smart Features

Neither has NFC payments. Neither has a mic or speaker. Neither has onboard music storage. Bluetooth LE on the Polar versus Bluetooth 5.2 on the Helio Strap — the newer spec on the Amazfit means slightly more efficient pairing, but in daily use you won’t feel it. The Helio Strap’s OLED can show notifications and metrics at a glance. The Polar Loop forces you to pull out your phone for everything.

Price & Value

The Polar Loop is $199.99 at launch. The Amazfit Helio Strap is $99.99. For $100 less you get a screen, more sensors, longer battery, and a lighter body. The only thing $100 more buys you on the Polar side is stainless steel construction and the Polar Flow platform. That’s a tough math problem for Polar to win.

Technical Specs

Spec	Polar Loop	Amazfit Helio Strap
Launch Price	$199.99	$99.99
Weight	29g	20g
Case Material	Stainless steel, textile band	Fiber-reinforced polymer
Display	None (screen-free)	OLED, 460 x 460
Water Rating	WR30 (30m)	5 ATM
Battery (Smartwatch)	192 hours (8 days)	240 hours (10 days)
GPS	None	None
Connectivity	Bluetooth LE	Bluetooth 5.2
Sensors	Optical HR (Precision Prime), Accelerometer	HR, SpO2, HRV, Accelerometer, Gyroscope, Geomagnetic, Temperature
NFC Payments	No	No
Release Date	September 2025	June 2025

The Verdict

The Amazfit Helio Strap wins this comparison on almost every dimension that matters — price, sensors, battery, and weight. At $99.99 it’s a serious budget alternative to Whoop, with HRV, SpO2, and temperature tracking that the Polar Loop simply doesn’t have. For most shoppers, this is the obvious pick.

Buy the Amazfit Helio Strap if you want recovery metrics — HRV, SpO2, sleep, skin temperature — without paying a subscription, and you like the idea of an OLED screen for quick glances. It’s the better value by a wide margin.

Buy the Polar Loop if you specifically want a screen-free band, already use Polar Flow, prefer stainless steel and textile over polymer, and trust Polar’s Precision Prime HR algorithm enough to pay double for it. It’s a niche pick, not a default one.

Frequently Asked Questions

Which is better overall, the Polar Loop or the Amazfit Helio Strap?

The Amazfit Helio Strap is the better pick for most people. It’s half the price, has more sensors, lasts two days longer per charge, and includes an OLED display. The Polar Loop only wins on materials and on Polar Flow ecosystem fit.

Does the Polar Loop track HRV or blood oxygen?

No. The Polar Loop’s sensor list is limited to Precision Prime optical heart rate and an accelerometer. If you want HRV, SpO2, or skin temperature tracking, the Amazfit Helio Strap is the only option of the two that supports them.

Is the Polar Loop worth twice the price of the Amazfit Helio Strap?

For most buyers, no. You’re paying the $100 premium for stainless steel construction, the Polar Flow app, and Polar’s HR algorithm reputation. Unless you’re already locked into the Polar ecosystem, the Helio Strap delivers more capability for less money.

Do either of these work for runners who want GPS?

No. Neither the Polar Loop nor the Amazfit Helio Strap has built-in GPS, so both rely on your phone for distance and pace tracking. If GPS matters, look at a Polar Pacer, Garmin Forerunner, or Amazfit Active series watch instead.

Which one works better with an iPhone versus Android?

Both pair with iPhone and Android over Bluetooth. The Polar Loop uses Bluetooth LE with the Polar Flow app, and the Helio Strap uses Bluetooth 5.2 with the Zepp app. Neither has platform-specific lock-in like Apple Watch or Galaxy Watch, so the experience is essentially identical on both phones.