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Choosing a heart rate strap for your iPhone

By · ORCID · LinkedIn · Updated

Short answer

Buy a sensor that sends Bluetooth, and check that before anything else. After that, decide between chest and arm, how many things need to listen at once, and what kind of battery you can live with. Brand matters less than people think. The standard heart rate service is the same everywhere.

Last checked: 12 October 2026. This page ranks nothing and carries no affiliate links.

What matters

1. Bluetooth. We know of no iPhone with an ANT+ radio, so an ANT+-only strap needs a bridge to Bluetooth. Dual-band straps are fine. See the ANT+ page.

2. Connections. Many straps accept one Bluetooth connection by default, and some accept two or three. If a watch or bike computer also needs the strap, count the slots. The two devices guide lists them.

3. Chest or arm. A chest strap sits against the ribs and is a familiar choice for hard efforts. An arm band is easier to put on and kinder on a long, easy session. Beatcast reads both and doesn't care where you wear it. For lifting there is a guide.

4. Battery. Coin cells are replaceable and last a long time. Rechargeable bands need a charger and a habit. Neither is wrong.

5. Strap material and fit. A strap that rubs gets left in a drawer. Check whether the elastic is replaceable and whether the sensor unclips for washing.

6. Memory and extras. Some sensors record on their own, which is handy as a backup. Beatcast shows live heart rate and doesn't need it.

What doesn't matter much

Colour. Brand loyalty. An app bundled in the box, unless you will use it. Whether the sensor appears in a particular app's compatibility list, since a standard-service sensor works in any app that reads the service.

Budget, mid or premium

There are good straps at every level. A budget strap from a maker such as Coospo sends Bluetooth heart rate like a premium one. Where the price goes up you usually get a better build, more connections, rechargeable batteries or memory. We name no figures because they move.

A short list to start from

The sensor table lists straps and arm bands that send the standard Bluetooth signal, with what to switch on and how many connections each takes. Pages for the Polar H10, Wahoo TICKR, Coospo and Garmin HRM-Dual go further.

Where Beatcast fits

Once the sensor sends Bluetooth heart rate, Beatcast reads it, puts the number on the Lock Screen and in the Dynamic Island while a session runs, and keeps the session. A sensor is required. Beatcast on the App Store. Fourteen days free, then one purchase.

Questions

Do I need a chest strap?

No. An arm band works too.

Is a more expensive strap more accurate?

We make no accuracy claims. DC Rainmaker publishes comparisons.

Will it work with my watch?

If the strap takes two connections, or the watch uses ANT+, yes.

What if it doesn't connect?

Start with the checklist.

Good to know

Beatcast is not a medical device. It is built for training and general wellbeing, and it cannot detect, diagnose, treat or monitor any condition. If something about your heart worries you, talk to a doctor rather than to an app.

The Bluetooth word mark is a registered trademark of Bluetooth SIG, Inc. Apple, iPhone and iPad are trademarks of Apple Inc. Polar, Wahoo, Coospo, Garmin and other names belong to their owners and are used only to say which sensors Beatcast can read. Beatcast is an independent product and is not affiliated with, endorsed by or certified by any of them.

Got yours working? Report it in r/beatcast and it goes on the list.