197 reviews
Content rating
Everyone
10K+
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Everyone
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About this app

Introducing FITTR ONE - a cutting-edge smart ring and app that monitors every vital health parameter and helps you become fitter, healthier and happier.

The Hart Ring isn’t just smart and stylish; it’s all you need for tracking every single health parameter. Paired with the app, you get an all-inclusive tool that accurately monitors your key fitness metrics, and gives you timely expert advice on how to improve them. Over time, this means better health and longevity.

Powered by FITTR, India’s biggest online fitness community with over 300,000+ success stories and more than 5 million community members globally.


**Here’s a glimpse of what FITTR ONE has to offer**

Your daily health performance, at a glance
Detailed tracking of Steps, Distance, Calories, Sleep, HRV, Skin Temperature, Women’s Health. Includes Quality of Life, Activity, Stress, Heart Rate, SpO2

Health data and reports
Expert advice and guidance to help you improve each parameter

Sleep
Get detailed data like Sleep Duration, Sleep Stages (Awake, REM, Light & Deep Sleep, Naps), Sleep Efficiency, Sleep Latency, Average Heart RAte, Average SpO2, and Average HRV

Heart Rate
Evaluates your heart health with detailed graphs

SpO2
Tracks fluctuations in SpO2 throughout the day and night

HRV
Tracks variations/fluctuations in your heart rate as you go about your activities

Stress
Monitors your stress levels and shares tips to reduce stress

Skin Temperature
Detects changes in skin temperature. Helps you track fluctuations with the help of daily, weekly and monthly reports.

Women’s Health (Only visible if gender set as female)
Tracks menstrual cycle and helps determine ovulation. For pregnant women, tracks key parameters right up to delivery date.

How to correctly wear your FITTR ONE Ring
For best performance and accurate readings, we recommend wearing your HART Ring on the index finger of your non-dominant hand. Middle and ring fingers work too, if that’s what you prefer. Just make sure that the ring fits securely and comfortably around the base of your finger - not too loose, not too tight.
Note: the ring’s sensor should face the palm side of your finger and not the top.

How to use the FITTR ONE app

After activating the ring, please pair with the FITTR ONE app to start using.

Not a medical device
This ring is not a medical device and should not be used as a substitute for professional medical judgement. It is not designed or intended for use in the diagnosis of disease or other conditions, or in the cure, mitigation, treatment, or prevention of any condition or disease. Please consult your healthcare professional prior to making any decisions related to your health.
The Smarter Fitness Solution
Updated on
Sep 15, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    App info and performance
  • This app may collect these data types
    Personal info, Health and fitness, and Photos and videos
  • Data is encrypted in transit
  • You can request that data be deleted

Ratings and reviews

194 reviews
Sai Kiran Nandula
August 13, 2026
I use the Hart ring with this app, and it's excellent. It has accurate tracking, reliable metrics, and a dashboard. It's one app for everything you need, like food and calorie tracking via AI, body metrics tracking, vitals, and you can even get lab tests done. Underrated part is that no recurring external subscription needed. everything is included if you get the ring.
2 people found this review helpful
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FITTR - Fitness & Personal Training
August 13, 2026
Hi Sai, We are pleased that you enjoyed the app. If there is anything we can do for you, just let us know at support@fittr.com! Have a wonderful day!
Himanshu Srivastava
July 25, 2026
This app is pretty balanced overall, with a good UI, solid customer support, and fairly accurate tracking. The sleep tracking can be a bit off sometimes, but I'd give the product and app an 8/10. It's a good smart ring for everyday use. Request you to add a battery widget for charging reminder. Battery lasts upto 10 days based on usage (like activity tracking)
2 people found this review helpful
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Arvind Srivatsav
July 30, 2026
Exceptional experience using the HART FITTR ring. A lot of insights and ability to track food, routines and quality of sleep, stress levels and many more on a real time basis. Battery life is also pretty good. So in all, i give a 4.8/5 for this.
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What’s new

We keep updating our app to provide you with a seamless experience. This update contains bug fixes