The overall winner is the Polar H10 heart rate monitor paired with your iWatch via Bluetooth, offering chest-strap accuracy. For a more convenient alternative, the Garmin HRM-PRO Plus provides dual ANT+ and Bluetooth with running dynamics.
Check price on AmazonFinding the best heart rate monitor for your iWatch can be confusing with so many options. While the Apple Watch has built-in optical HR sensors, many athletes and fitness enthusiasts find that a dedicated chest strap or armband monitor provides superior accuracy, especially during high-intensity interval training or weightlifting. Our research ranks the top seven compatible HR monitors based on user reviews, expert consensus, and technical specs.
We analyzed owner feedback, professional testing data, and feature comparisons to identify the most reliable devices. Whether you need a budget-friendly option for casual runs or a premium monitor with advanced metrics, this roundup covers the best choices. All picks work seamlessly with Apple Watch via Bluetooth or ANT+, ensuring real-time heart rate data in your favorite fitness apps.
How we rank
Our ranking is based on cross-referencing owner reviews, expert ratings from fitness sites, and comparing accuracy, comfort, battery life, and connectivity features for each model. See our method.
Quick picks
| Best for | Product | Who it suits |
|---|---|---|
| Best Overall | Polar H10 Heart Rate Sensor | Serious athletes wanting gold-standard accuracy for HR monitoring with Apple Watch. |
| Best for Runners | Garmin HRM-PRO Plus | Runners who want running dynamics and accurate HR data on Apple Watch. |
| Best Value | Wahoo TICKR X | Fitness enthusiasts wanting a reliable, affordable chest strap with built-in accelerometer. |
| Best Budget Armband | Scosche Rhythm24 | Users who prefer an armband over a chest strap for comfort and convenience. |
| Best Lightweight | Polar Verity Sense | Swimmers and triathletes needing a lightweight, versatile optical HR monitor. |
| Best Budget Chest Strap | Garmin HRM-Dual | Budget-conscious users wanting a reliable chest strap for accurate HR on Apple Watch. |
| Best for Beginners | Polar OH1+ | Newcomers to external HR monitors who want simplicity and comfort without high cost. |
The picks, compared
Polar H10 Heart Rate Sensor
The Polar H10 is widely regarded as the most accurate chest strap heart rate monitor available. It features built-in memory, ECG-grade accuracy, and connects via Bluetooth to your iWatch. The strap is comfortable and washable, and the sensor detaches for easy charging. Reviewers consistently praise its reliability for running, cycling, and HIIT.
What owners say: Owners report near-perfect HR tracking that matches medical-grade equipment, with many noting fewer dropouts than optical sensors. The chest strap is comfortable for long sessions, though a few mention the strap can slip during intense movement.
- Highest accuracy among consumer HR monitors
- Compatible with most apps via Bluetooth and ANT+
- Long battery life (up to 400 hours)
- Chest strap may be uncomfortable for some
- No running dynamics or advanced metrics
Garmin HRM-PRO Plus
The Garmin HRM-PRO Plus combines accurate heart rate monitoring with running dynamics like stride length, ground contact time, and vertical oscillation. It stores data and transmits to your iWatch via ANT+ or Bluetooth. The strap is soft and adjustable, and the sensor has a long battery life. Runners appreciate the extra metrics without needing a Garmin watch.
What owners say: Owners love the running dynamics and say the HR accuracy is excellent for pacing. Many note the strap stays put during runs, but some find the sensor module bulky.
- Provides running dynamics
- Dual transmission (ANT+ &
- Bluetooth)
- Comfortable strap
- Sensor can be bulky
- Battery life shorter than Polar H10 (up to 1 year)
Wahoo TICKR X
The Wahoo TICKR X offers accurate heart rate tracking with a built-in accelerometer for running metrics like cadence. It connects via Bluetooth and ANT+ to Apple Watch and other devices. The strap is comfortable and the sensor has a long battery life. It also has onboard memory for workout storage. Reviewers praise its value and reliability.
What owners say: Owners report solid HR accuracy and reliable Bluetooth connection to Apple Watch. The running cadence feature is a bonus, though some have experienced durability issues after a year.
- Accurate HR with accelerometer for running metrics
- Onboard memory stores workouts
- Great value for features
- Durability concerns over time
- Strap may irritate sensitive skin
Scosche Rhythm24
The Scosche Rhythm24 is an optical armband that offers accurate heart rate monitoring without the need for a chest strap. It connects via Bluetooth and ANT+ to Apple Watch. The device has onboard memory, a rechargeable battery, and is waterproof to 50m. It's comfortable for all-day wear and is often recommended for those who dislike chest straps.
What owners say: Owners appreciate the comfort and ease of use, with many saying it's accurate enough for most workouts. Some note occasional dropouts during high-intensity intervals compared to chest straps.
- Comfortable armband design with no chest strap
- Onboard memory and rechargeable battery
- Waterproof to 50m
- Optical sensor less accurate than chest straps
- Battery life only up to 30 hours
Polar Verity Sense
The Polar Verity Sense is an optical HR monitor worn on the arm or temple for swimming and other activities. It has 600 hours of battery life, onboard memory, and Bluetooth/ANT+ connectivity. It's extremely lightweight and comfortable, making it ideal for long sessions. The optical sensor provides accurate HR even in water, and it pairs easily with Apple Watch.
What owners say: Owners rave about its comfort and long battery life, especially for swimming. Some report that accuracy is good but not on par with chest straps for variable heart rate changes.
- Lightweight and comfortable
- Excellent battery life (600 hours)
- Works well in water
- Optical sensor may be less accurate during rapid HR changes
- No running dynamics
Garmin HRM-Dual
The Garmin HRM-Dual is a simple, affordable chest strap that provides accurate heart rate data via Bluetooth and ANT+. It uses a soft, comfortable strap and has a long battery life. It lacks advanced metrics but is a reliable choice for basic HR monitoring. Reviewers praise its price point and reliability for the cost.
What owners say: Owners appreciate the low cost and consistent HR tracking, noting it's a solid upgrade from wrist-based sensors. Some mention the strap can be less durable over time.
- Affordable price
- Dual transmission (Bluetooth &
- ANT+)
- Reliable HR accuracy
- No advanced metrics
- Strap durability concerns
Polar OH1+
The Polar OH1+ is an optical HR sensor worn on the arm, offering accurate readings without a chest strap. It connects via Bluetooth to Apple Watch and has onboard memory for independent use. The device is simple to use and comfortable. Reviewers find it a good entry point for improving HR tracking accuracy during workouts.
What owners say: Owners find it easy to set up and comfortable for daily use, with decent accuracy for steady-state cardio. Some note occasional inaccuracies during interval training compared to chest straps.
- Simple, comfortable armband design
- Onboard memory for standalone use
- Good battery life (up to 12 hours)
- Optical accuracy lags behind chest straps
- No ANT+ connectivity
How to choose
- Accuracy. Chest straps like the Polar H10 use ECG technology for the highest accuracy. Optical sensors (armbands) are less accurate during rapid HR changes. Choose based on your activity: if you do interval training, a chest strap is best.
- Comfort. Chest straps can be uncomfortable for some, especially during long sessions. Armband models like the Scosche Rhythm24 or Polar Verity Sense offer a more comfortable alternative, though they may compromise on accuracy.
- Connectivity. Ensure the HR monitor supports Bluetooth to pair with Apple Watch. Some also offer ANT+ for use with other devices. Dual transmission allows simultaneous connection to a watch and a phone or bike computer.
- Battery Life. Replaceable coin cell batteries (e.g., Polar H10) can last hundreds of hours, while rechargeable models (e.g., Scosche Rhythm24) need charging every 30 hours. Consider your usage frequency when choosing.
- Additional Features. Some monitors offer running dynamics, onboard memory, or water resistance for swimming. Decide if you need extra metrics like cadence or stride length, or if basic HR data is sufficient.
Frequently asked questions
Can I use any heart rate monitor with my Apple Watch?
Most Bluetooth-enabled HR monitors work with Apple Watch. You need to pair the monitor in the Settings app under Bluetooth. Some monitors also require a compatible fitness app to view data.
Is a chest strap more accurate than an armband for Apple Watch?
Yes, chest straps like the Polar H10 are generally more accurate because they measure electrical signals from the heart. Armband optical sensors can be affected by movement and sweat, though they are more comfortable.
Do I need a heart rate monitor if I have an Apple Watch?
The Apple Watch's optical sensor is adequate for casual use, but for high-intensity training or more precise HR data, a dedicated monitor offers better accuracy and reliability.
How do I pair an external heart rate monitor with my Apple Watch?
Put the HR monitor in pairing mode, then on your Apple Watch go to Settings > Bluetooth and select the monitor. Open a compatible app like Workout or Strava to see your heart rate.
Can I use a heart rate monitor for swimming with my Apple Watch?
Yes, some HR monitors like the Polar Verity Sense are waterproof and can be used for swimming. However, Bluetooth does not transmit through water, so data is stored on the monitor and synced later.
What is the best budget heart rate monitor for Apple Watch?
The Garmin HRM-Dual is a reliable and affordable chest strap option. For a budget armband, the Polar OH1+ is a good choice. Both offer solid accuracy and compatibility.
The verdict
The Polar H10 is our overall winner for its unbeatable accuracy and reliability with Apple Watch. For runners wanting advanced metrics, the Garmin HRM-PRO Plus is a top choice. If you prefer a comfortable, strap-free option, the Polar Verity Sense is excellent for swimming and long workouts.
Video Guide
Video: Related tutorial from YouTube