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Experience Improvement


Measure time, distance, technique and heart rate of each swim with the highest accuracy


Set up your personalized training zones to get the most out of each session


Track your progress in technique, speed and fitness, and monitor your training load over time.

Connect And Dive In

Apple watch

Apple Watch

Phlex effortlessly connects with any Apple Watch. All you need to do is connect the app and jump in.

Polar verity sense

Polar Verity Sense

The head-worn Polar Verity Sense is a cut above for unbeatable performance, data breakdowns, and precision.

Cruise Past Your Swimming Goals

Casual swimmer

Whether you’re swimming for fitness or love challenging yourself in the pool – Phlex builds understanding, motivation, and healthy habits to keep you diving in for more.

Avid Swimmer

Jaded by unreliable data or generic, inaccurate swimming apps? Never again! Phlex’s personalized tracking system gives you an in-depth analysis of each session – with technique, physiology, and heart rate to make you enjoy your training even more.


Gone are the days of the stopwatch and tedious spreadsheets. Today’s coaches expect more. Phlex’s dashboard provides an at-a-glance view into the teams' performance, while our data platform enables any team to adopt a scientific approach with ease.

Phlex and Polar Partnership

Pushing the Limits of Swimming Technology

Phlex and Polar have partnered to deliver the gold standard of swimming technology. Phlex offers advanced AI algorithms for tracking swimming performance, while Polar provides the reliability of sensors and exceptional real-time heart rate monitoring. Together, they are creating a unique and comprehensive solution for swimmers of all levels. Get ready to take your performance to the next level.

Become our next success story

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Darra Torres - 5-time Olympian and Bestselling Author

Swimming has always been a love for me. I think it’s even more so now because I don’t have to keep track of what I’m doing. Phlex does the work for me, making swimming much more fun.

Darra Torres - 5-time Olympian and Bestselling Author
Jason Lezak - Olympic Gold Medalist

Phlex is the perfect tool for educating yourself about your body. Once I gained a better understanding of myself, my training approach changed. When I was a kid, there wasn’t much thought put into what we did in practice. We focused on repetitions instead of the details that would really make us faster in competition. Later in my career, I started to pay more attention to stroke data, physiology, and recovery. It became less about just doing and more about improving my race weaknesses.

Jason Lezak - Olympic Gold Medalist
Harold Primat - Former Race Car Driver, Avid Triathlete

Phlex keeps detailed recordings of all my swimming sessions. Nothing is missed, and I know exactly what strokes I did during each workout. It also shows me the intensity of my sessions and gives me the total of my monthly distance. I can swim fully relaxed, knowing Phlex does the counting for me. I am now fully addicted and cannot imagine swimming without my device anymore.

Harold Primat - Former Race Car Driver, Avid Triathlete
Ron Aitken - Olympic Coach For Team USA

I’ve been using Phlex technology every day for over 2 years. What we love about it is the ability to personalize the training for each athlete and see how they are progressing throughout the week. It also gives me the right data to monitor if I’m not overtraining my swimmers and when to give them opportunities to recover.

Ron Aitken - Olympic Coach For Team USA
Abbas Karimi - Paralympian, World Championships Medalist

Before Phlex, there was never an option that provided me the ability to track my training with so much detail. I find myself checking my scores every day after training. Seeing my improvement so simply defined has been a physical and mental relief.

Abbas Karimi - Paralympian, World Championships Medalist
Vincent Lam - Age Group Swimmer’s Parent

The precision of Phlex enabled us to train our son under the USRPT program for the past few years. The cloud service enabled us to monitor our son's progress, whether he trained with his school swim team or us. The heart rate monitor allowed us to modify the training program in real-time if needed, a valuable tool for any swimmers.

Vincent Lam - Age Group Swimmer’s Parent
Alia Atkinson - World Champion

Phlex helps me push. I get feedback that shows me what to work on next.

Alia Atkinson - World Champion
Calvin Justus - Swimming Influencer

Phlex accurately tells me what my heart rate was throughout my session. It breaks down the sets and gives me times for each part of the workout.

Calvin Justus - Swimming Influencer
Cody Miller - Olympic Medalist, Swimming Vlogger

I use Phlex to monitor my taper because it tracks everything I’m doing leading up to a meet. I look at my stroke trends and heart rate on all pace sets.

Cody Miller - Olympic Medalist, Swimming Vlogger
Jazz Carlin - Olympic Medalist

Distance swimming has always been a huge part of my life. What I love most about Phlex is that you always get insightful feedback. Reading through pace charts and seeing my overall improvement so clearly has really changed my relationship with training.

Jazz Carlin - Olympic Medalist
Dan Wallace - Olympic Medalist

Phlex allows me to do things I haven’t done before. It brings joy.

Dan Wallace - Olympic Medalist
Marty Hendrix - Masters Coach

As a USMS coach and a Masters swimmer myself, I know how important it is to maintain a safe training environment for my athletes, regardless of age. Phlex gives me the ability to monitor my athletes from a distance or work closely with those who have health concerns. It’s given me peace of mind and more confidence to provide each individual with their own version of training.

Marty Hendrix - Masters Coach
Paul Pesqueira - Fitness Swimmer

I love the data and the feedback that helps you improve your performance. It’s remarkable. I have been swimming for many years, from High School to Masters Swimming and Phlex has allowed me to work on various aspects of my swimming. I would encourage any swimmer from elite to novice to try this product.

Paul Pesqueira - Fitness Swimmer
Stephan Barmentloo - Fitness Swimmer

I'm a recreational swimmer and not a member of a swim club. Phlex provides me with the incentive to go swimming on a regular basis. Phlex tracks every lap, movement, and heartbeat and converts it into a wide array of statistics that can be reviewed after every session. Comparing sessions and seeing the progress I make on a physical but also technical level gives me a lot of motivation to keep going at it and live healthily.

Stephan Barmentloo - Fitness Swimmer

Redefining the limits of swimming performance.

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Track Your Progress


  • Calories
  • Max Heart Rate
  • Average Heart Rate
  • Lap Time
  • Time
  • Splits


  • Readiness Score
  • Training Zones
  • Fitness Tests
  • Technique Progress
  • Stroke Efficiency
  • Training effect


  • Stroke Recognition
  • Distance Per Stroke
  • Stroke Rate
  • Stroke Index
  • Kick Recognition


  • Set Recognition
  • Set Specific Heart Rate
  • Set Breakdown
  • Drill Detection
  • Interval Detection

Seen on:

The Wall Street Journal
Swim Swam

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Frequently Asked Questions

Are there additional costs for coaches?

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All coaches can use our platform for free. Coaches can purchase memberships for their athletes and invite multiple coaches within their organization to access the data. Athletes with memberships can invite their coaches to review their training data.

Does Phlex integrate with Strava or Training Peaks?

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We are working hard to deploy this highly requested feature as soon as possible.

How can I use the Polar sensor for real-time heart rate data?

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Download the Polar Flow app or the Polar Team app (for coaches), complete the simple setup process, and view real-time heart rate data on your phone or iPad.

How do I add my coach as an athlete?

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Ask your coach to create a free account at and invite you to their group via email.

How does Phlex track open-water swimming?

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Since the Polar Verity Sense device doesn't have a GPS sensor, we use an AI model that calculates the distance swum in open water using stroke data.

How long does it take to sync a workout?

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Syncing one hour's worth of swimming takes approximately 1-2 minutes for iOS and new Android phone users. Older Android phones may experience longer offloading times. We are working with our partner Polar to optimize the experience.

What do I need to do if I already own a Polar device?

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You can join the platform on a software membership only and start your subscription with a 30-day free trial. Please make sure that your device firmware is up-to-date (v.2.1.0) before you start. You can update your device via the Polar Flow app.

What is Phlex PRO?

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Phlex PRO is a desktop app that offers coaches and athletes a detailed view of their workouts and training progress. Athletes can sign in to their account at, and coaches can create a free account and invite their athletes.

What's the difference between the Polar Verity Sense device and the Apple Watch when it comes to swimming tracking?

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The main difference is heart rate accuracy. The head-worn device that sits tightly on your temple provides highly accurate heart rate readings. While the Apple Watch also offers good quality heart rate data, the water that can get in between the wrist and the sensor can lead to poor heart-rate accuracy.

When will Apple Watch compatibility be available?

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We are in the final stages of the project and plan to release the Apple Watch integration by the end of October. We are currently in beta. Sign up for our newsletter to be notified of the release.

Achieve Peak Performance with Fully Personalized Data from Phlex, the Ultimate Swimming Platform

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