# SIGMA LINK vs XOSS

The clearest difference is review sentiment: XOSS at 52% against SIGMA LINK's 9%. XOSS also leads on rating (4.4 vs 1.5) and ratings volume (395 vs 8). SIGMA LINK's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 18). 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 1.5. That said, the two scores are not equally well evidenced: XOSS has 395 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 9% of SIGMA LINK's written reviews are positive against 52% of XOSS's.

SIGMA LINK ships an update every 4 months, XOSS every 6 weeks. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | SIGMA LINK | XOSS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.5 (8 ratings)](https://appshunter.io/ios/app/sigma-link/id1147984544/reviews) | **[4.4 (395 ratings)](https://appshunter.io/ios/app/xoss-train-with-science/id1267749721/reviews)** |
| Number of ratings | 8 | **395** |
| Positive reviews | 9.0% of reviews | **52.2% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 76 MB | 110 MB |
| Requires iOS | **12.0** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [SIGMA-ELEKTRO GmbH](https://appshunter.io/developer/803939887) | [XOSS HONG KONG CO., LIMITED](https://appshunter.io/developer/1530144728) |

## What reviewers say

### SIGMA LINK

[App page](https://appshunter.io/ios/app/sigma-link/id1147984544)

Easily transfer training data from compatible devices to your smartphone. View personal bests, statistics, and completed tracks. Sync all your training data, workouts, and sport profiles with cloud integration for constant access.

**Highlights:** Transfer training units, View training statistics, Track personal bests, Manage device settings, Sync with SIGMA CLOUD, Access workouts and sport profiles

**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 SIGMA LINK free?

SIGMA LINK 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, SIGMA LINK or XOSS?

XOSS is rated higher. SIGMA LINK averages 1.5 out of 5 from 8 ratings, while XOSS averages 4.4 from 395 ratings.

### Do SIGMA LINK or XOSS have ads?

Neither SIGMA LINK nor XOSS shows ads.

### Which is updated more often, SIGMA LINK or XOSS?

SIGMA LINK ships an update every 4 months, and XOSS every 6 weeks. Most recently, SIGMA LINK was updated on October 7, 2026 and XOSS on October 14, 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.*