# STF Kronos vs Rx Crossfit

The clearest difference is iOS requirement: STF Kronos at 13.0 against Rx Crossfit's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 3, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | STF Kronos | Rx Crossfit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (9 ratings)](https://appshunter.io/ios/app/stf-kronos/id1476804951/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 64.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 230 MB | 6 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [STUFFACTORY](https://appshunter.io/developer/1476804950) | [Luis Conrado Garcia Alegria](https://appshunter.io/developer/1821577498) |

## What reviewers say

### STF Kronos

[App page](https://appshunter.io/ios/app/stf-kronos/id1476804951)

Sync your smartwatch to track sports performance, including hiking, cycling, and running. Monitor heart rate, steps, and sedentary periods. Access additional features based on your specific smartwatch model.

**Highlights:** Smartwatch synchronization, Sports performance monitoring, Heart rate tracking, Step counting, Sedentary period alerts, iOS Health App integration

**Features:** Vision Pro support

**In-app purchases:** none


### Rx Crossfit

[App page](https://appshunter.io/ios/app/rx-crossfit/id6757625130)

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

**In-app purchases:** none


## Frequently asked questions

### Is STF Kronos free?

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

### Is Rx Crossfit free?

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

### Do STF Kronos or Rx Crossfit have ads?

Neither STF Kronos nor Rx Crossfit shows ads.

### Which is updated more often, STF Kronos or Rx Crossfit?

STF Kronos ships an update every 2 months, and Rx Crossfit every 2 months. Most recently, STF Kronos was updated on November 3, 2026 and Rx Crossfit on October 5, 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.*