Letsfit vs 3+ PRO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Letsfit
Track your daily fitness and wellness with this app. It records and interprets health data like steps, sleep, and heart rate, and analyzes exercise routines with route mapping. It also acts as a notifications assistant for your connected smartwatch.
- Health data display (steps, sleep, heart rate, calories)
- Exercise data analysis with route tracking
- Smartwatch notifications assistant (calls, SMS)
- Professional data interpretations
- Synchronization with Apple Health (HealthKit)
Read full descriptionHide full description
Letsfit cares about people's daily fitness and wellness. When you use the Letsfit app for long enough in conjunction with exercise, you will see noticeable improvements in your health. The main features: 1. Health data display: Letsfit records data relevant to your physical condition such as steps taken, sleep hours, heart rate, calories burned, while also provides you with professional interpretations over these data. 2. Exercise data analysis: Letsfit is also able to record while you exercise, and will display various data, including a detailed route and various exercise data analysis afterwards. 3. Notifications assistant: Letsfit pushes CALL、SMS and other app notifications to the connected smartwatch, you can mute, answer, or hang up on the connected device while receiving an incoming call. We will keep updating the app to support more devices, with more reliability and exciting features. Please note: screenshots shown represent features supported but devices might not have all the features listed. Connect to synchronize data to Apple Health (HealthKit), to achieve data movement, data and consumed calories sleep simultaneous recording to Apple Health (HealthKit).
3+ PRO
Track daily activity like steps, distance, and calories. Set personalized fitness goals and monitor progress. Features include heart rate monitoring, smart notifications, and weather updates, with data syncing to HealthKit.
- Activity tracking (steps, distance, calories)
- Personalized goal setting
- Heart rate monitoring
- Smart notifications
- Weather updates
- HealthKit synchronization
Read full descriptionHide full description
Overview Activity Tracking: Monitor your daily steps taken, distance traveled, calories burned and more. Personal Goal Setting: Set personalized step, calorie, distance, active minutes and sleep goals based on your activity level to reach your target fitness level. Health information can be synchronized to Health Kit. Smart Features Heart Rate Monitor: Maintain your heart rate level during workouts or measure your resting heart rate to see how your fitness level has improved over time. Smart Notifications: Receive and read a variety of notifications all on the watch. Weather App: Check today’s weather . Health information can be synchronized to HealthKit.
Screenshots
Verdict
The clearest difference is rating: Letsfit at 4.5 against 3+ PRO's 3.6. Letsfit also leads on ratings volume (5.6K vs 576). 3+ PRO's advantage is review sentiment (43% vs 25%). On price, update cadence, ads and in-app purchases 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.
Letsfit holds the better App Store score, 4.5 against 3.6. That said, the two scores are not equally well evidenced: Letsfit has 5.6K ratings behind it against 576, so its average is the more settled of the two. Written reviews complicate that: 25% of Letsfit's written reviews are positive against 43% of 3+ PRO's, so the app with the better star average is not the one people write more warmly about.
Letsfit ships an update every 5 weeks, 3+ PRO every 2 months. Both last shipped on October 16, 2026.
| Parameter | Letsfit | 3+ PRO |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (5.6K ratings) — better | 3.6 (576 ratings) |
| Positive reviews | 25.4% of reviews | 42.6% of reviews — better |
| Number of ratings | 5.6K — better | 576 |
| Update frequency | Every 5 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 134 MB | 106 MB |
| Age rating | 4+ | 4+ |
| Developer | Letsfit LLC | 3Plus International |
Customer experience
Letsfit
3+ PRO
User reviews
Letsfit
From 5.6K App Store ratingsWhat we love
- 🚀 Great overall watch
- 👍 Affordable and stylish
- 👍 Helpful health tracking features
- 👍 Comfortable and durable
- 👍 Excellent customer support
Room to improve
- 🐛 Syncing and connectivity issues
- 🐛 Inaccurate step and sleep tracking
- 🐛 Unreliable heart rate monitoring
- 🐛 Frequent software glitches and crashes
- 🔋 Short battery life
3+ PRO
From 576 App Store ratingsWhat we love
- 👍 Good watch and app
- 🚀 Affordable and customizable
- 🔒 Robust security features
- 💡 Helpful for tracking activity
Room to improve
- 🐛 Connectivity issues
- 🐛 Unreliable notifications
- 🐛 Sync and pairing problems
- 🔋 Battery life concerns
Bugs and requests
Letsfit
Reported bugs
4 issues- Watch time not updating correctly
- App fails to sync data consistently
- Inability to change watch faces
- Disconnection issues between watch and phone
Requested features
5 requests- Add more workout modes
- Allow editing of activity data
- Improve notification handling
- Provide map tracking for activities
- Add blood pressure monitoring
3+ PRO
Reported bugs
4 issues- App crashes and freezes
- Inaccurate activity tracking
- Compatibility issues with newer devices
- Inability to change time format
Requested features
4 requests- Add call and text functionality
- Expand workout tracking options
- Improve watch face customization
- Implement sleep tracking feature
In-app purchases
Letsfit
No in-app purchases
3+ PRO
No in-app purchases








