Polar Loop Review

If you want reliable 24/7 heart-rate and deep sleep/recovery insights with a week of battery and no subscription, buy this; if you need on‑wrist metrics or the slickest automatic workout detection, skip it. Score: 7.7/10.

---

The quick answer

At £149.50 the Loop is the easiest way to get continuous, accurate heart-rate and Polar’s Nightly Recharge sleep/recovery insights without paying monthly. It’s worth the price if you want low-friction, always-on tracking and long battery life; it’s not for people who need on‑wrist screens or the finest workout auto-detection.

---

What we tested

We used a retail Polar Loop (medium band, black) for six weeks: daily wear through commutes and office days, runs and gym sessions, and every night for sleep tracking. Testing included regular smartphone syncs to the Polar Flow app on iPhone and Android.

---

What it does well

Battery life — up to eight days between charges

You can wear the Loop all week and sleep in it without hunting for the charger; our unit routinely hit 6–8 days depending on activity, which beats most display-equipped bands that need charging every 1–3 days.

24/7 heart-rate — Precision Prime optical sensor

Polar’s Precision Prime sensor delivers continuous heart-rate data you can trust for resting HR and recovery trends; that constant stream is better for long-term recovery tracking than single daily spot checks.

Sleep and recovery insights — Nightly Recharge and SleepWise

The Loop unlocks the same Nightly Recharge and SleepWise scoring used on Polar’s pricier watches, giving staged sleep and a recovery score in Polar Flow with no subscription — useful if you actually act on recovery guidance.

Design and comfort — 29 g, screen‑free

At 29 g and with a soft, screenless band, the Loop disappears on your wrist; it’s far less distracting than a smartwatch and comfortable to wear all night for accurate sleep staging.

No subscription required

Polar provides full access to sleep and recovery analytics without a recurring fee — a clear win over subscription models like Whoop if you want forever access without monthly costs.

---

Where it falls short

No on‑wrist metrics

Because the Loop is screenless you can’t glance at real-time pace, HR, or timers on your wrist; if you run intervals or need instant feedback during workouts, this will frustrate you.

Automatic workout detection and feedback

Automatic workout/strain detection works but isn’t as refined as Whoop or the best multisport watches; athletes who rely on flawless auto-logging or advanced training cues will prefer a dedicated GPS watch.

App workflow polish

Several reviewers and our testing found workout detection and in-app session editing fiddly — people who want a seamless training workflow will notice the extra taps and manual fixes.

---

How it compares

Closest competitor at this price: Fitbit Charge 6 (roughly £120–£150). Choose the Polar Loop if you prioritise subscription-free deep sleep and continuous HR in a distraction-free, week‑long battery band. Choose the Fitbit Charge 6 if you want an on-wrist display, quick glance metrics, built-in smartwatch features and GPS on some runs.