Garmin Cirqa vs Polar Loop: two $199.99 bands, two very different ways to train.

By Raji Shah · Published 2026-10-15

The Garmin Cirqa and the Polar Loop both cost $199.99 in the US, neither needs a subscription, and neither has a screen or built-in GPS. The differences show up the moment you go for a run. The Cirqa has a start button, can send its heart rate to other gear, and feeds Garmin's training model. The Loop has no buttons for everyday use, can't share its heart rate with other gear, and leans on Polar's long-running sleep and recovery tools. For most runners, the deciding question is which ecosystem already records their training.

Price and subscriptions

Both bands cost $199.99 in the US and give away their core metrics, so you can stop there with either one. In the UK, the Loop is cheaper, at £149.50 against £179.99 for the Cirqa (list prices as of October 2026). Garmin's optional Connect+ ($6.99 a month or $69.99 a year) adds live heart-rate graphs, manual laps, guided workouts, and AI insights. Polar Flow is free, and Polar's only paid plan, the Polar Fitness Program, requires a Polar watch and doesn't list the Loop.

US list prices as of October 2026, assuming they do not change; verify them at checkout.

Recording runs

This is the biggest practical difference. The Cirqa has a physical button: set your favorite activity to Run in Garmin Connect, then press once to start and again to stop, with a vibration to confirm. With Phone GPS turned on for Run in the band's Activity Options and your phone with you, you get pace, distance, and route whether you start with the button or in the app; some auto-detected outdoor workouts can also switch on phone GPS by themselves. If Garmin Connect shows an "Activity in Progress" prompt, tap Resume, then stop and save from the recording screen; Garmin's forum staff have confirmed that End closes the workout without saving it.

The Loop has no buttons for everyday use, so a run with pace, distance, and route has to be recorded in the Polar Flow app. Before your first run, pair the Loop as Flow's heart-rate sensor in Training settings and set Flow's location access to Always, with Precise location on. For each run, pick an outdoor sport profile in Flow and choose Train with GPS, then pause or stop in the app; hold Stop to save. During the run, Flow shows live heart rate and pace on your phone and offers voice guidance at no extra cost. Garmin Connect also shows the Cirqa's current heart rate for free during app-recorded workouts, but live heart-rate and zone graphs and manual laps need Connect+.

Leave your phone at home and the Cirqa's button still records the run with heart rate, but distance is estimated from motion, and one independent reviewer found it was often off by 20% or more. Without the phone, the Loop can only catch a run through auto-detection, so don't count on a route, distance, or pace. Neither band shows live numbers on your wrist. If you want pace and splits while you run, record on a GPS running watch and let the band handle the rest of the day.

Auto-detection

Treat automatic detection as a backup on both bands. The Loop starts a session when your heart rate and movement pass set thresholds, doesn't save efforts under 10 minutes, and files them as "Other indoor" until you pick the sport. Polar itself recommends recording manually when exact start and end times matter, and it documents GPS only for sessions started in the app. Reviewers have consistently found the Loop's detection unreliable, and in an August 2026 independent test of five screen-free bands, with the Loop worn on the upper arm, its detection ranked last and the Cirqa's third.

The Cirqa has its own blind spot: it keeps its heart-rate sensor in a low-power mode until it recognizes a workout, so a late start costs you workout heart-rate data. On either band, a run that is never detected or started adds nothing to your training load.

Heart-rate accuracy and arm bands

On steady runs, both bands tracked chest straps and watches closely in published tests. Fast intervals are harder: the Cirqa's wrist readings can lag at the start of reps, and the Loop's interval results are few and mixed, with the better numbers coming from testers who wore it on the upper arm.

Both brands now sell an official upper-arm band. Testers found Garmin's $59.99 Upper Arm Band cleans up hard efforts on the Cirqa. Polar's $29.90 Sport Armband launched on October 7, 2026; Polar says it is for training, not 24/7 wear, and no independent test of it had been published by mid-October. With either brand, wear the band on the wrist overnight and move it to the upper arm for hard sessions. For heart-rate-paced intervals, a chest strap paired with a GPS watch is still the safer choice.

Heart-rate broadcast and ecosystems

The Cirqa broadcasts heart rate over ANT+ and Bluetooth, so it can feed a Garmin Edge, Zwift, or compatible gym equipment, and its data merges with any Garmin watch in Garmin Connect. After an August firmware update, many owners reported Bluetooth broadcasts dropping while ANT+ kept working. Firmware 3.20 added a Bluetooth pairing mode, but owner reports since have been mixed; our Cirqa problems guide covers what to try. The Loop can't broadcast at all. Polar says its single Bluetooth connection is reserved for syncing with Polar Flow, so it works as a heart-rate sensor only inside Flow, not for a watch, another app such as Zwift, or gym equipment. The Loop's data reaches Strava, TrainingPeaks, and Apple Health through Polar Flow.

If you already own a Polar or Garmin watch

Polar advises against wearing the Loop and another Polar device at the same time, because sessions and training load can be duplicated. For Polar watch owners, that means alternating: the watch for runs, the Loop for sleep and rest days. Garmin owners can wear the Cirqa alongside their watch, record each run on one device, and set a Primary Wearable and Primary Training Device in Garmin Connect. If you already wear your Garmin watch day and night, though, the Cirqa adds little.

Recovery, sleep, and training metrics

Polar's recovery headline is Nightly Recharge. It has two parts: an ANS (autonomic nervous system) charge, which compares heart rate, heart-rate variability, and breathing rate from roughly the first four hours of sleep with your 28-day baseline, and a sleep charge. It needs three nights of wear before it appears. Sleep Plus Stages, SleepWise, and Daily Alertness round out the sleep tools, and Training Load Pro gives a Cardio Load for each recorded workout; Polar says Muscle Load isn't available on the Loop.

Garmin spreads recovery across Training Readiness, Body Battery, HRV Status, and sleep score, and adds Training Status, training load, and recovery time, all free. For VO2 max, the Cirqa estimates it from a timed 15-minute brisk walk or run, while the Loop uses Polar's Fitness Test, a five-minute estimate taken lying still. Neither offers a race predictor or running power. In published testing, both get sleep and wake times broadly right, while sleep stages are less certain, as on any wrist band. Our recovery metrics guide explains how to read these scores.

Battery, comfort, and charging

Garmin rates the Cirqa for up to 10 days and Polar rates the Loop for up to 8. In published testing, both commonly lasted about a week. Some Cirqa owners report less, and Garmin says all-day Pulse Ox and heart-rate broadcasting shorten battery life. Both come off your wrist to charge on a proprietary cable.

The Loop is heavier, at 29 g against about 21 g for the Cirqa, but its pod is 5 mm shorter, and reviewers found it comfortable enough to forget, including overnight. The Cirqa's longer pod can overhang a small wrist. The Loop has no vibration motor and no wake alarm, while the Cirqa can wake you with a vibration. Polar rates the Loop WR30 and suitable for swimming, but it records no swim metrics such as distance or strokes. The Cirqa's wrist heart rate has tested poorly in the water, so neither suits serious swimmers.

Apps

Garmin Connect is deep and customizable, and the Cirqa's data sits alongside any Garmin watch or Edge you own, though it presents data more than it explains it. Polar Flow is free and full of data, but reviewers consistently describe it as dated and cluttered, and a full redesign had not arrived by mid-October 2026. If coaching matters more than data, read our WHOOP review.

Choose the Garmin Cirqa if...

• You train with a Garmin watch or Edge and want one app.
• You want to start runs with a physical button.
• You want to send heart rate to a bike computer, Zwift, or gym equipment.
• You want Training Readiness, Training Status, and Body Battery without a subscription.
• You want a vibrating alarm.

Choose the Polar Loop if...

• You already use a Polar watch or Polar Flow.
• You want Nightly Recharge and Polar's sleep tools without a subscription.
• You are happy to start runs in the Flow app with your phone.
• You want a cheaper official arm band, or you are buying in the UK, where the Loop costs less.
• You prefer a band with no buttons to press and no buzzing.

Verdict

Unless you already train with Polar, the Cirqa is the more practical band: it starts runs with a button, shares heart rate with other gear, and plugs into Garmin's training model. The Loop makes sense if you already live in Polar Flow, want a band that stays silent, and don't mind starting every run from your phone. Both cost $199.99 with no subscription, so decide which ecosystem records your training, then pick the band that fits around it. For more, read the full Garmin Cirqa review and our Garmin Cirqa vs Fitbit Air comparison.

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