The best heart rate monitor for swimming needs more than a water-resistant case: it should stay in place, capture useful data in the pool, and work with the device or app you use to train. Some monitors store data during a swim and sync afterward, while others offer a flexible optical sensor you can wear on your arm or clip to your goggles. These five options suit different needs, from swimming-specific tracking to a versatile strap for pool and land workouts.
Quick Comparison
| Heart Rate Monitor | Design | Swimming-Specific Features | Best For |
|---|---|---|---|
| HRM-Swim Heart Rate Strap | Chest strap | Stores swim heart rate and syncs to a compatible watch afterward | Swimmers who want swim-focused data |
| POLAR Verity Sense | Optical armband or goggle clip | Can be clipped to goggles; records sessions for later transfer | Swimmers who prefer not to wear a chest strap |
| POWR LABS Bluetooth ANT+ Chest Strap | Chest strap | Described as suitable for swimming under a wetsuit | Multisport training and broad device pairing |
| Scosche Rhythm+ 2.0 | Optical armband | Waterproof rating, but swim-specific tracking details are limited | Arm-based tracking for workouts on land |
| Polar H9 Heart Rate Sensor | Chest strap | Waterproof sensor; swim-specific data handling is not described | Everyday training across compatible equipment and apps |
Our Picks: Best Heart Rate Monitor For Swimming reviews
1. HRM-Swim: A Chest Strap Built Around Pool Training
The HRM-Swim is the most swimming-focused option in this group. Its strap is designed for swimmers, and the monitor stores heart rate data while you swim before syncing it to a compatible watch when the activity is over. That after-swim transfer is useful when you do not want to rely on a live connection during a pool session.
The small monitoring module matches the width of the soft, non-slip strap. The product description also lists ANT and Bluetooth Low Energy connectivity, plus stored activity information such as steps, calories, and intensity minutes. Check that your watch supports the sensor and its sync features before buying; compatibility can matter as much as the strap itself.
This is a focused choice for swimmers who want a chest strap and swim-session data. Compared with the Verity Sense, it does not offer an arm-worn or goggle-clip setup. The product information also does not specify strap sizing, so confirm fit details before ordering.
Pros:
- Designed specifically for swimming and diving dynamics
- Stores heart rate data during a swim and syncs afterward
- Soft, non-slip strap with a compact monitoring module
- ANT and Bluetooth Low Energy connectivity are listed
Cons:
- Requires a compatible watch for the described automatic sync
- Does not offer the alternative arm or goggle-clip fit of an optical sensor
Verdict: Choose the HRM-Swim if swim-specific data storage and a non-slip chest strap matter more to you than wearing options.
2. POLAR Verity Sense: Flexible Optical Tracking for the Pool
The Verity Sense is a small optical monitor you can wear on your upper or lower arm. For swimming, its included goggle-clip option gives you another placement choice, and you can record a session for transfer to your phone afterward. That makes it a flexible alternative if you would rather avoid a chest strap.
It supports live heart rate broadcasting, two simultaneous Bluetooth connections, and ANT+ connections. Its one-button operation keeps the basic controls simple, while its small size is designed to stay out of the way. For the most dependable reading, the sensor needs to sit snugly against your skin when worn on your arm.
Compared with the HRM-Swim, the Verity Sense offers more ways to wear the sensor, but its swim data workflow differs: the description emphasizes recording and transferring a session, rather than automatically syncing swim data to a watch. Confirm that your preferred app or watch supports the connection you plan to use.
Pros:
- Can be worn on the arm or clipped to goggles
- Supports recording a session for later transfer
- Offers Bluetooth and ANT+ connectivity options
- Compact design leaves the wrist free
Cons:
- Arm placement needs a snug fit against the skin
- Compatibility and the swim-data workflow may vary by connected device or app
Verdict: The Verity Sense is a strong fit if you want an optical sensor with multiple wearing options and the ability to record a session for later review.
3. POWR LABS Chest Strap: A Multisport Pick for Pool and Land
This chest strap uses both Bluetooth and ANT+ to connect with compatible watches, cycling computers, fitness equipment, and apps. Its soft fabric strap adjusts across a wide stated size range, and the product description says it can be used for swimming under a wetsuit. That makes it worth considering for athletes who move between water and other training.
The listed IPX67 rating and replaceable battery are practical features for a multisport sensor. The product description also states a long battery life, but actual use will depend on training and device conditions. One setup detail to note: the strap needs to be worn before pairing.
Its swim information is less specific than the HRM-Swim’s. The POWR LABS strap is presented as a broad-use monitor, but the supplied details do not describe swim-data storage or post-swim syncing. If you need a particular pool workflow, check that your watch or app handles it before choosing this strap.
Pros:
- Supports both Bluetooth and ANT+ connections
- Adjustable fabric strap is designed for a comfortable fit
- Product description notes use for swimming under a wetsuit
- Uses a replaceable battery rather than requiring regular charging
Cons:
- Swimming-specific data storage is not described
- Needs to be worn before pairing
Verdict: Consider the POWR LABS strap if you want one chest sensor for several sports and your swim setup is compatible with its connection method.
4. Scosche Rhythm+ 2.0: An Armband for Training Versatility
The Rhythm+ 2.0 is an optical armband that can be worn on the forearm, bicep, or tricep. It pairs with Bluetooth and ANT+ devices and apps, and the adjustable, breathable strap offers an alternative to a chest band. The product description lists uses such as running, cycling, gym training, and recovery tracking.
It has an IP68 waterproof rating and a stated continuous battery life of up to 24 hours. However, the supplied information does not explain how it records or syncs heart rate data during swimming. A waterproof rating alone does not confirm that a monitor provides the pool data or swim workflow you need, so this is a less direct choice than the HRM-Swim or Verity Sense for swim-focused use.
The Rhythm+ 2.0 may make more sense if you want one armband for land-based workouts and occasional exposure to water. Its HRV mode is another feature for compatible training apps, but it is not a substitute for checking the device’s swimming support.
Pros:
- Can be worn on the forearm, bicep, or tricep
- Connects through Bluetooth or ANT+
- IP68 waterproof rating is listed
- Includes an HRV mode for compatible apps
Cons:
- Swimming-specific tracking and data syncing are not detailed
- Its described uses focus mainly on land-based workouts and recovery
Verdict: Pick the Rhythm+ 2.0 for flexible arm-based training, but choose a more clearly swim-focused monitor if pool tracking is your main priority.
5. Polar H9: A Straightforward Chest Sensor for Compatible Gear
The Polar H9 is a chest-strap heart rate sensor with Bluetooth and ANT+ connectivity. It is designed to work with compatible equipment and smartphone apps, making it a practical option if you already use devices that support those standards. The soft strap is offered in different size ranges, so selecting the right fit is important.
The product is described as waterproof, but the supplied details do not explain whether it stores heart rate data during a swim or how it transfers data afterward. That leaves an important question for pool users: check the compatibility and swim-recording behavior of your watch or app before relying on the H9 for swimming.
Compared with the HRM-Swim, the H9 is described as a general-purpose sensor rather than a swim-specific strap. It may suit everyday training across compatible gear, but its listed features provide less guidance for swimmers who need a clearly defined pool-data workflow.
Pros:
- Bluetooth and ANT+ connectivity
- Works with compatible heart rate equipment and phone apps
- Soft chest strap is offered in size ranges
- Uses a replaceable CR2025 battery, which is included
Cons:
- Swim-specific data storage and syncing are not described
- You need to choose a strap size that fits your body
Verdict: The H9 is a sensible general chest sensor if your equipment supports it, but swimmers seeking explicit swim-data features should look first at the HRM-Swim or Verity Sense.
How to Choose a Heart Rate Monitor for Swimming
Look for a clear swim-data workflow
Water can affect how a sensor communicates with a watch or phone, so do not assume a monitor will show a live reading in the pool just because it supports Bluetooth or ANT+. Check whether it records heart rate during the swim, sends data to a compatible watch afterward, or requires a particular app. The HRM-Swim explicitly describes storing swim data and syncing after the activity; the Verity Sense describes recording a session and transferring it later.
Choose the wearing style you can keep in place
A chest strap may suit you if you are comfortable wearing one and want a sensor designed around swim sessions. An optical armband can feel less restrictive, and a goggle clip gives the Verity Sense another placement option. Fit matters: a strap that shifts or an optical sensor that does not sit snugly against your skin may be less useful during a workout.
Check device and app compatibility
Before buying, match the monitor’s connection options to your watch, phone, training app, or pool equipment. ANT+ and Bluetooth support can broaden your choices, but it does not guarantee that every device handles stored swim data in the same way. Confirm the exact pairing and transfer method you plan to use.
Separate water resistance from swim tracking
A waterproof or water-resistant rating tells you something about exposure to water, but it does not by itself confirm that a product records useful heart rate data during swimming. Look for details about swim recording, storage, and syncing. For example, the Scosche Rhythm+ 2.0 is described as waterproof, yet its supplied feature details focus on workouts outside the pool rather than a specific swim-data process.
Consider battery and maintenance needs
Some monitors use replaceable batteries, while others need charging. Think about how often you train and whether you prefer to recharge or replace a cell. Also check the battery type and follow the product’s instructions. For a chest strap, pay attention to fit and care guidance; for an armband, make sure the strap is secure and comfortable where you plan to wear it.
Match the monitor to your full training routine
If swimming is your main sport, prioritize clear swim-specific features and a compatible post-session workflow. If you also run, cycle, or train indoors, a dual-connection strap or versatile optical sensor may offer more value across your routine. The best choice is the one that fits both your workouts and your existing devices.
Frequently Asked Questions
Can a heart rate monitor send data to a watch while I swim?
It depends on the monitor, watch, and connection method. Some products record data during a swim and sync it afterward rather than relying on a live connection. Check the product details and your watch’s compatibility before buying.
Which option here is most clearly designed for swimming?
The HRM-Swim is the most explicitly swim-focused option in this selection. Its description says it stores heart rate data during swimming and automatically syncs it to a compatible watch after the activity.
Can I use an optical armband for swimming?
The POLAR Verity Sense is described as an optical monitor that can be clipped to goggles or worn on the arm, and it supports recording a session for later transfer. Check your preferred device or app for compatibility and how it handles swim data.
Does a waterproof rating mean a monitor will track my swim?
Not necessarily. A waterproof rating describes water protection, but it does not confirm swim-specific heart rate recording or data syncing. Look for an explicit description of those features before choosing a monitor for pool use.
Should I choose a chest strap or an armband?
Choose based on comfort, fit, and how you plan to record workouts. A chest strap may be a good fit if you want a swimming-focused design, while an armband can offer a less restrictive feel and flexible placement. The Verity Sense can also be clipped to goggles.
What should I check before purchasing a monitor?
Confirm that the monitor works with your watch or app, supports the data workflow you need, and fits your body. For swimming, specifically check whether it stores data during a session and how that data reaches your device afterward.
Final Recommendation
For swimmers who want a monitor with clearly described pool features, the HRM-Swim is the most direct choice because it stores swim heart rate data and syncs with a compatible watch afterward. If you prefer an optical sensor and want more than one wearing option, consider the POLAR Verity Sense. For the other three picks, confirm swim-data support with your watch or app before purchasing, since their supplied product details focus more on general training than on a complete swimming workflow.