# Diagnostics vs XOSS

The clearest difference is review sentiment: Diagnostics at 100% against XOSS's 52%. Diagnostics also leads on iOS requirement (9.0 vs 18). XOSS's advantage is update cadence (every 6 weeks vs every 28 months) and rating (4.4 vs 4.1). On price, ads, in-app purchases and monetization model there is nothing between them.

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 4.1. That said, the two scores are not equally well evidenced: XOSS has 397 ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 100% of Diagnostics's written reviews are positive against 52% of XOSS's, so the app with the better star average is not the one people write more warmly about.

Diagnostics ships an update every 28 months, XOSS every 6 weeks. The most recent releases landed on October 8, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Diagnostics | XOSS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (10 ratings)](https://appshunter.io/ios/app/diagnostics/id608904497/reviews) | **[4.4 (397 ratings)](https://appshunter.io/ios/app/xoss-train-with-science/id1267749721/reviews)** |
| Number of ratings | 10 | **397** |
| Positive reviews | **100.0% of reviews** | 52.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 5 MB | 110 MB |
| Requires iOS | **9.0** | 18 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Racelogic](https://appshunter.io/developer/608904500) | [XOSS HONG KONG CO., LIMITED](https://appshunter.io/developer/1530144728) |

## What reviewers say

### Diagnostics

[App page](https://appshunter.io/ios/app/diagnostics/id608904497)

This free application helps owners of a specific hardware accessory check its operational status and view GPS data. It connects to a high-performance GPS receiver for mobile devices.

**Highlights:** Check hardware health, View GPS data, Supports VBOX Sport accessory, Works with iPhone and iPod Touch, Free to use

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### XOSS

[App page](https://appshunter.io/ios/app/xoss-train-with-science/id1267749721)

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.

**Highlights:** Syncs with bike computers, Records workout data, Advanced data analysis, GPS tracking on map, Route planning, Syncs with Strava/TrainingPeaks

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Clean and simple interface
- 🚀 Reliable data tracking
- 💡 Useful 3D route visualization
- 🤝 Seamless Strava integration
- 💰 Good value for money

**What reviewers complain about**

- 🐛 Inconsistent GPS connectivity
- 🔄 Sync issues with Strava
- 🔍 Limited data analytics
- 🌐 Lack of language options (e.g. French, Russian)
- 🔋 Battery drain concerns

**Reported bugs**

- App crashes after recent updates
- Unable to update device firmware on iOS
- Sensor connectivity problems
- Incorrect distance/speed measurements

**Requested features**

- Add more detailed metrics (e.g. elevation, power)
- Improve route editing and privacy controls
- Introduce automatic sync options
- Provide more comprehensive data export capabilities


## Frequently asked questions

### Is Diagnostics free?

Diagnostics is free to download, with no in-app purchases.

### Is XOSS free?

XOSS is free to download, with no in-app purchases.

### Which has better reviews, Diagnostics or XOSS?

XOSS is rated higher. Diagnostics averages 4.1 out of 5 from 10 ratings, while XOSS averages 4.4 from 397 ratings.

### Do Diagnostics or XOSS have ads?

Neither Diagnostics nor XOSS shows ads.

### Which is updated more often, Diagnostics or XOSS?

Diagnostics ships an update every 28 months, and XOSS every 6 weeks. Most recently, Diagnostics was updated on October 8, 2026 and XOSS on October 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*