FITTR ONE vs T12
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FITTR ONE
This smart ring and app combination tracks vital health metrics like sleep, heart rate, and stress. It provides personalized expert advice to help users improve their fitness and overall well-being. The system offers detailed insights into daily health performance and long-term trends.
- Vital health parameter monitoring
- Detailed fitness metric tracking
- Personalized expert advice
- Sleep stage analysis
- Heart rate and SpO2 tracking
- Stress and skin temperature monitoring
- Women's health tracking
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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 HART 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.
T12
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T12 Fitness – Personal Training. On Your Terms T12 is your dedicated mobile platform built for personal training clients and general public who wants to get fit. With curated workout programs, expert-led video instructions, personalized diet plans, and powerful progress tracking — T12 helps you stay consistent, accountable, and transform with purpose. FEATURES Custom Workout Plans Workouts are tailored by your personal trainer to meet your fitness goals. Programs evolve as you improve, ensuring continual progress. Form-Focused Video Guides Every exercise includes clear video demonstrations to help you learn correct form, avoid injuries, and train confidently — even outside the gym. Personalized Diet Plans Nutrition plans that align with your training goals. Fuel your body the right way, without guesswork. Progress Tracking Log your workouts, track body stats, and view transformation milestones. See how far you’ve come — and where you’re headed. Stay Connected with Your Trainer Your personal trainer is always within reach. Get ongoing support, motivation, and accountability through the app. Built for Personal Training Clients. Designed for Real Results. Whether you're just getting started or taking your fitness to the next level, T12 keeps your entire journey in one place — focused, flexible, and fully guided. Transform the Way You Train. Download T12 Today.
Screenshots
Verdict
The clearest difference is update cadence: FITTR ONE at every 10 days against T12's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
FITTR ONE ships an update every 10 days, T12 every 2 months. Both last shipped on October 19, 2026.
| Parameter | FITTR ONE | T12 |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (13 ratings) — better | — |
| Positive reviews | 73.5% of reviews | — |
| Number of ratings | 13 — better | — |
| Update frequency | Every 10 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 16.2 | 15.0 — better |
| Further details — not scored | ||
| Size | 272 MB | 53 MB |
| Age rating | 12+ | 4+ |
| Developer | SQUATS | Vijobi Vakkachan |
Bugs and requests
FITTR ONE
Reported bugs
10 issues- Activity report generation fails after workouts
- Activity tracking is inaccurate, especially during runs and gym workouts
- App has syncing issues, requires ring to be close to phone
- App randomly logs out
- Charging issues with the ring
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- Battery life drastically reduced after firmware updates
- Sleep tracking not working consistently or accurately
- Login issues
- Report generation fails for activities like Badminton or Weight training
- App shutters and shudders on iPhone 15
Requested features
7 requests- Improve activity tracking accuracy
- Enhance integration with Apple Health
- Option to hide or remove unused app sections (e.g., Nutrition)
- Allow adding activities after they are completed
- Display activities in a list format (e.g., walking - 23 min)
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- More explanation on stress management
- Push notification for low battery (<20%)
T12
Not enough reviews yet to summarise bugs or requests.
In-app purchases
FITTR ONE
No in-app purchases
T12
No in-app purchases









