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Comparison of Fitness Trackers: Fitbit Air vs WHOOP MG vs Amazfit Helio vs Polar Loop 2

a month ago by Raphael to c/wearable

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nyakojiru 4 points a month ago

Summary: 4 screenless fitness trackers compared over 2 weeks

Michael Bryan tested Whoop MG ($199–359/yr subscription), Fitbit Air ($99), Amazfit Helio ($99), and Polar Loop 2 ($99).

Category winners:

  • ❤️ Heart rate (intervals): Amazfit Helio, by far (R=.939). Whoop 2nd, Fitbit struggled, Polar worst.
  • 👣 Steps: Fitbit most accurate (994/1000) but overcounts "phantom" steps; Amazfit tends to undercount; Polar least accurate.
  • 😴 Sleep: Amazfit best, especially when traveling (time zones). Whoop close 2nd. Fitbit confused by the date line; Polar weak.
  • 📱 App: Whoop best, Zepp (Amazfit) solid. Fitbit too much AI/text. Polar worst.
  • 🔋 Battery: Whoop ~12–14 days, Amazfit ~8–9, Fitbit/Polar ~7.
  • Comfort: Fitbit Air lightest; Polar most "premium" but strap frayed.

Verdict:

  • 🏆 Everyday user → Amazfit Helio (accurate HR/sleep, good app, no subscription).
  • 💪 Advanced athlete / health data → Whoop (ECG, blood pressure, deeper insights) if you pay the subscription.
  • ⚡ Fitbit Air: solid pick if you want the thinnest/lightest + like its app.
  • ❌ Polar Loop 2: not recommended despite the nice design.

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Wearable computers are small computing devices worn on the body, ranging from general-purpose systems like smartwatches to specialized sensors for health monitoring and augmented reality. The technology is defined by its constant interaction with the user, allowing for hands-free, eyes-free access to data and computational support while the user engages with the physical environment.

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