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Complete Swim System


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.

From Pool to Pro… Cruise Past Your Swimming Goals

Casual swimmer

Whether you’re swimming for fitness, or just love challenging yourself in the pool – Phlex builds understanding, motivation, and a healthy competitive streak to keep you diving for more…

Avid Swimmer

Jaded by unreliable data, or generic, inaccurate swimming apps? Never again! Phlex’s personalized training zones give you in-depth analysis of each session – with technique, physiology and heart rate to maximize your progress.


Gone are the days of the stopwatch and tedious spreadsheets. Today’s coach expects more. Phlex’s dashboard provides at-a-glance data for swimming teams, while our calculator tool helps create sets for individual athletes.

Be our new success story

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Abbas Karimi - Para Olympian, 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 - Para Olympian, World Championships Medalist
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
Dan Wallace - Olympic Medalist

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

Dan Wallace - Olympic Medalist
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
Harold Primat - Former Formula Driver, 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 Formula Driver, Triathlete
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
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
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
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
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
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

Choose Your Plan

Phlex Monthly Access

  • Rolling subscription, cancel anytime.
  • Compatible with Apple Watch and Polar trackers.

Phlex Annual Access

Save 40%

Phlex Annual Access

  • Includes Polar Sensor+ 3 months free

Are you a coach? Book a demo

Connect + Dive In

Apple watch

Apple Watch

Casual swimmer? Phlex effortlessly connects with any Apple Watch, so you can download, jump in and go…

Polar verity sense

Polar Verity Sense

Perfect for the pro and semi-pro athlete. Polar is a cut above for unbeatable performance, data breakdowns and precision.

Measure Every Stroke

  • Polar is the gold standard of sensors. Clipped onto your goggle strap, the lightweight sensor holds constant contact with skin above the spine, producing excpetional, accurate data.
  • Each stroke shows exactly how hard your heart is working—and propels you into achieving more.

Seen on:

The Wall Street Journal
Swim Swam

Frequently Asked Questions

Can I use the app without a membership?

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Yes, we offer free trials of every membership tier. For swimmers, we offer a 14-day trial of the entire experience – and then provide a feature-limited version. (To see data in the platform, you’ll need to upgrade to a paid ‘Pro’ account.)

For coaches, those accounts are free.

Can I wear the Polar Verity Sense in the ocean?

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Yes, the Polar Verity Sense is safe to wear in nearly all water environments.

Does Phlex connect with Strava?

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Yes, you can connect the Phlex Swim app with your Strava account.

How do I record a workout with the Polar Verity Sense?

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Simply turn on the Verity Sense and start the workout by pressing and holding the button on top. 

Enjoy your swim…

And finally, press and hold the button again, to end the workout and turn it off. It couldn’t be simpler!

How should I store the Polar Verity Sense when not in use?

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We recommend using the included mesh storage bag to keep your Verity Sense and Goggle Clip together.

Is Phlex only for professional swimmers?

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Absolutely not! Whether you swim for fitness, the thrill of competition or love of gliding through the water, ask yourself these questions: Are you an ambitious swimmer? Do you want to get the most out of each and every swim? And would you like to become faster, more agile, more intelligent with every stroke? 

If your answer’s ‘yes’ then phlex is for you!

Is my watch compatible?

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You can check the most up-to-date list of compatible devices here.

My watch already tracks swimming. Why should I use Phlex?

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Good question! Truth is, the watch market has become saturated with high-quality hardware from a wide range of manufacturers – but the swimming experience with these devices is severely lacking…

First, they lack accuracy in tracking the foundational parts of a swimming routine, such as workout times, distance, or workout breakdown. (And chances are, they will completely ignore core stroke metrics such as rate, distance per stroke, and stroke efficiency).

Secondly, most apps track general metrics – they do not go into the multi-layered nature of swimming (and nor are they designed by people who love the sport as much as we do!) 

Most importantly, they do little to provide you, the swimmer or coach, with any kind of actionable insight to build and improve upon.

Tell me more about the Phlex Membership…

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We have 3 levels of membership. The first, ‘Phlex Membership’ offers full access to the Phlex Swim mobile app. Billed monthly, you bring your own tracking device. 

The second, ‘Phlex Pro’ is an annual premium subscription that includes a Polar Verity Sense (our recommended device for the most accurate and detailed experience). This membership also enables you to connect with a ‘Coach Account.’

The third, ‘Phlex Coach’ is a fully personalized experience for every swim coach. Read more about that here

What is the difference between an annual ‘Phlex Pro’ membership and a monthly ‘Phlex’ membership?

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The ‘Pro’ tier is an annual-only membership that includes the Polar Verity Sense free of charge when you sign-up. A ‘Phlex Pro’ membership is also required to send data to Coach Accounts. The ‘Phlex’ membership is a monthly subscription that gives full access to the mobile app and is compatible with all the devices found here.


Track Your Swim

Analyze your real-time metrics and adjust your swimming


  • 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

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

Book a Demo
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