heart rate tracking app

Heart Rate Ninja is a heart rate tracking app for groups & individuals that makes workouts more fun & effective. Earn points, level-up, and compete on the leaderboards while reaching your fitness goals.

For Gyms & Trainers For Individuals

Burn Calories,
Earn Points πŸ”₯

Earn points by working out. If you go to a gym that uses Heart Rate Ninja, you can earn bonus points for joining workouts at your gym, competing in competitions, and winning challenges.

What can I unlock? Get Started

Reach a new level each season πŸ†

Unlock masks by earning points. Everyone starts at the white mask, do you have what it takes to unlock the black mask? Heart Rate Ninja enters a new season every three months. Masks are reset each season to keep things fresh & give you a chance to improve every season.

Optimize your workout

Get more
out of your workout πŸ’ͺ

Your workout intensity is measured by your heart rate zone. Heart Rate Ninja lets you know your current heart rate zone in realtime to take the guesswork out of training. Review your workout when you're done and we'll send you a personalized workout report email.

What users are saying Get Started

What users are saying πŸ’¬

"... big numbers, big colors, and fun ways to gain personal rewards"

"... keeps me accountable for my own efforts in every class. My workouts are never as good without it. In addition, it has been designed by someone who is right there on the floor with us and knows what is needed: big numbers, big colors, and fun ways to gain personal rewards as an additional incentive to work for that gold. Outstanding product design, incredibly useful, an awesome partner to help stay fit!”

β€” Lori G πŸ˜€

"I always leave class knowing I did my best and I was safe"

β€œ... I can’t imagine not wearing it during my workouts. I find it to be accurate, reliable and comfortable. The monitor helps me to stay focused. It also helps me to stay in the correct heart rate zone and keeps me safe. By that I mean the monitor lets me see if I need to ramp up my workout or tone it down a bit. I totally enjoy the challenges and competitions - they help me to do my best during my workouts. I always leave class knowing I did my best and I was safe.”

β€” P Waldron 😎

"... the best part of the work out is the Heart Rate Ninja"

β€œ... the best part of the work out is the Heart Rate Ninja, I’m kind of competitive when it comes to working out in a group and the Heart Rate Ninja helps me know where my heart rate is throughout my work out. The little challenges and points system it offers is great. I know as long as I have the Heart Rate Ninja when working out I have given my best effort every class!”

β€” Paul A 😁

"... lets me know when I need to push harder and when I need to take a rest"

β€œI have been using the Heart Rate Ninja system now for 6 months and I can’t imagine working out without it. It helps me stay in the right heart rate zones and lets me know when I need to push harder and when I need to take a rest. I love all of the challenge and competition features they really help motivate me during a workout and make the workout more challenging and fun!”

β€” Jon T πŸ™‚

Rated 5 / 5 stars

⭐⭐⭐⭐⭐ on the App Store, 2022

For gym members & individuals

  • βœ… Workout at the gym & at-home
  • βœ… Join gym workouts
  • βœ… Workout review emails
  • βœ… Use your own heart rate monitor
  • βœ… Worldwide leaderboards
  • βœ… Monitor your heart rate zone
  • βœ… Track how many calories you've burned
  • βœ… Earn points, share your achievements
  • βœ… Unlock masks, track your progress
  • FREE for individuals!
Download the app

For gyms, trainers, & groups

  • βœ… Run group workouts
  • βœ… Run team competitions
  • βœ… Run time challenges
  • βœ… Gym-wide leaderboards
  • βœ… Gym workout history
  • βœ… Display on TV or monitor
  • βœ… Workout review emails
  • βœ… Use your own heart rate monitors
  • βœ… Many more features designed for gyms!
  • Starts at $19.99 / month for gyms *
See Gym Features Gym Pricing *

Get started for free βœ…

Whether you're a gym member, individual, or instructor we'll guide you through the process of downloading the app and getting setup. Send us an email if you have any questions

Download the App For Gyms & Trainers

βœ… Step 1

the app &
sign up πŸ”₯

Download Heart Rate Ninja on the App Store Download Heart Rate Ninja on Google Play

βœ… Step 2

connect your heart rate monitor ❀️

Why do I need a heart rate monitor?

Heart Rate Ninja uses your heart rate monitor to measure your workout intensity.

Can I create a profile without a monitor?

Yes. Heart Rate Ninja uses your heart rate monitor to measure your workout intensity.

Can I use my own heart rate monitor?

Yes! Heart Rate Ninja does not require any proprietary hardware.

Which heart rate monitors are compatible?

Heart Rate Ninja is compatible with most popular Bluetooth LE heart rate monitors. If you have any questions about a specific heart rate monitor feel free to send us an email

Apple Watch & Apple Health

Unlike most heart rate monitors, the Apple Watch does not allow apps to access heart rate data via Bluetooth. We highly recommend a Bluetooth chest strap or armband heart rate monitor.

My heart rate monitor isn't being detected
  1. Make sure your monitor is turned on
  2. Make sure you are wearing your monitor
  3. Make sure your monitor is within 30' of your phone or tablet
  4. Make sure your monitor is not paired with another app
  5. Make sure your monitor is not paired with another device
  6. Make sure your monitor's battery is charged and working
  7. Make sure your monitor is Bluetooth LE compatible
  8. Make sure your phone or tablet's Bluetooth is enabled
  9. Make sure Heart Rate Ninja has Bluetooth access
  10. Make sure Heart Rate Ninja has Location access
How do I estimate my maximum heart rate?

"To estimate your maximum age-related heart rate, subtract your age from 220. For example, for a 50-year-old person, the estimated maximum age-related heart rate would be calculated as
220 – 50 years = 170 beats per minute (bpm)."

What is the max monitor range?

The max range will vary based on environmental obstructions (walls, workout equipment, etc.) between the app and your heart rate monitor(s) and the Bluetooth capabilities of your phone or tablet.

In a gym with a high number of obstructions we've seen a max distance of 30-50'. However, there are a number of steps you can take to make sure you achieve the highest distance.

The most important is to make sure there is an unobstructed line-of-sight from your phone/tablet to each heart rate monitor.

If you're coming from another heart rate monitoring app you should see the same range you saw in other apps (all apps communicate with the monitors in a similiar manner).

If you're having any issues related to range send us an email. We can help diagnose any issues and get you setup with a possible software-based solution.

How many monitors can be connected at once?

The maximum number of heart rate monitors that can be connected depends on the Bluetooth capabilities of your phone or tablet.

We have had gyms run workouts with 25 monitors at the same time.

If you're unsure about the Bluetooth capabilities of your device request a demo and we'll give you a free trial so you can make sure Heart Rate Ninja works for your needs.

βœ… Step 3

Burn calories, earn points, level up πŸ†

How to join a gym
  1. Ask your gym for their Heart Rate Ninja invite code
  2. Enter the invite code in your profile
  3. Your profile will automatically appear at the gym and your instructor will be able to add you to workouts, competitions, challenges, etc.
What is an invite code?

Invite Codes link clients to a specific gym or trainer. This is important for gym members, as this is what allows you to participate in their challenges, display on their monthly leaderboard and makes it easy to connect with other Ninjas at the gym!

How heart rate zones work