XOSS vs FitFly(US)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
XOSS
Record and analyze your outdoor sports activities with detailed metrics like speed, cadence, and heart rate. Plan routes, sync data from various bike computers, and share your progress with friends. Offers advanced data analysis with charts and GPS tracking.
- Syncs with bike computers
- Records workout data
- Advanced data analysis
- GPS tracking on map
- Route planning
- Syncs with Strava/TrainingPeaks
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XOSS is an "ALL IN ONE" application specialised in cycling and other outdoor activities. With XOSS you can do: - Data syncing from verified bike computers. Including: XOSS, CooSpo, CYCPLUS, etc.. - Workouts recording with all the data you need for free: Speed, Cadence, Power, Heart-rate, Elevation, Calories, Distance, Time, etc... - Advanced data analyzing with charts and graphics. GPS track on map, Elevation, Speed, Cadence, Heartrate Charts, Training zone analysis(Heart-rate, Power), and much more is coming! - Sync with other apps like STRAVA, TRAININGPEAKS. - Share with your friends by connecting to Strava and Training Peaks or share your workouts to social media. - Route planning before your journey. - XOSS uses Health Kit to export your activities into the Health app and to read heart rate. Follow us on FB and IG: xoss.co. More information is available at https://www.xoss.co
FitFly(US)
Accurately record various fitness activities like running, cycling, and walking. Get multi-dimensional body state evaluations and professional physiological indexes to make your fitness journey more scientific and effective. Enjoy playback of your fitness records and synchronize data with Apple Health.
- Accurate fitness activity recording
- Multi-dimensional body state evaluation
- Professional physiological indexes
- Exercise track record and playback
- Apple Health data synchronization
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· Record your fitness accurately Support running, cycling, walking and other activities; · Multi-dimensional evaluation of body state Make fitness, weight loss and exercise more scientific through FitFly; Each exercise can obtain professional physiological indexes, so that exercise more scientific and effective; · Find more fun in life Support exercise track record, playback of your fitness records; Tips: This application supports Apple Health. With authorization, you can synchronize your steps, sleep, heart rate and other health data to Apple Health.
Screenshots
Verdict
The clearest difference is rating: XOSS at 4.4 against FitFly(US)'s 3.1. XOSS also leads on review sentiment (52% vs 13%) and ratings volume (399 vs 86). FitFly(US)'s advantage is iOS requirement (10.0 vs 18). 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.
XOSS holds the better App Store score, 4.4 against 3.1. Both are backed by a comparable volume of ratings — 399 and 86 respectively. Written reviews point the same way: 52% of XOSS's written reviews are positive against 13% of FitFly(US)'s.
XOSS ships an update every 6 weeks, FitFly(US) monthly. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.
| Parameter | XOSS | FitFly(US) |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (399 ratings) — better | 3.1 (86 ratings) |
| Positive reviews | 52.3% of reviews — better | 13.3% of reviews |
| Number of ratings | 399 — better | 86 |
| Update frequency | Every 6 weeks | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 18 | 10.0 — better |
| Further details — not scored | ||
| Size | 110 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | XOSS HONG KONG CO., LIMITED | 琳 陈 |
Customer experience
XOSS
FitFly(US)
User reviews
XOSS
From 399 App Store ratingsWhat we love
- 👍 Clean and simple interface
- 🚀 Reliable data tracking
- 💡 Useful 3D route visualization
- 🤝 Seamless Strava integration
- 💰 Good value for money
Room to improve
- 🐛 Inconsistent GPS connectivity
- 🔄 Sync issues with Strava
- 🔍 Limited data analytics
- 🌐 Lack of language options (e.g. French, Russian)
- 🔋 Battery drain concerns
FitFly(US)
From 86 App Store ratingsWhat we love
- 👍 Looks and fits well
- 👍 Works perfectly (after update)
- 👍 Connects very well
- 👍 Good for the price point
Room to improve
- 🐛 Cannot convert units (C to F, cm to in)
- 🐛 Useless/Not working
- 🐛 Cannot sync contacts, messages, weather
- 🐛 App is useless, never stays connected
- 🐛 Health items not tracked
Bugs and requests
XOSS
Reported bugs
4 issues- App crashes after recent updates
- Unable to update device firmware on iOS
- Sensor connectivity problems
- Incorrect distance/speed measurements
Requested features
4 requests- Add more detailed metrics (e.g. elevation, power)
- Improve route editing and privacy controls
- Introduce automatic sync options
- Provide more comprehensive data export capabilities
FitFly(US)
Reported bugs
10 issues- Cannot convert units (C to F, cm to in)
- App is useless, never stays connected
- Steps not cumulative
- Cannot upload photos to watch screen after update
- Gesture wake up doesn't work after connecting to app
Show 5 moreShow fewer
- Does not stay connected to phone
- Weather sometimes doesn't work
- App doesn't record anything
- Does not monitor sleep
- Some features not functional (heart bpm, blood pressure, sleep)
Requested features
11 requests- Convert units (Celsius to Fahrenheit, centimeters to inches)
- More customization options for wallpapers/themes
- Add Persian language support
- Improve app connectivity and stability
- Enable cumulative step tracking
Show 6 moreShow fewer
- Allow viewing of remote capture preview
- Sync health data with Apple Health
- Fix gesture wake-up functionality
- Add more wallpaper/theme options
- Improve texting response templates
- Add functionality for heart bpm, blood pressure, and sleep tracking in the app
In-app purchases
XOSS
No in-app purchases
FitFly(US)
No in-app purchases
