# Aetrex Achilles vs Trax

The clearest difference is review sentiment: Trax at 100% against Aetrex Achilles's 23%. Trax also leads on rating (5.0 vs 2.8). Aetrex Achilles's advantage is ratings volume (34 vs 3) and device support (3 vs 1). 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.

Trax holds the better App Store score, 5.0 against 2.8. That said, the two scores are not equally well evidenced: Aetrex Achilles has 34 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 23% of Aetrex Achilles's written reviews are positive against 100% of Trax's.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on July 31, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Aetrex Achilles | Trax |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.8 (34 ratings)](https://appshunter.io/ios/app/aetrex-achilles/id1536083899/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/trax-step-tracker/id6746829468/reviews)** |
| Number of ratings | **34** | 3 |
| Positive reviews | 22.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free | Free |
| Size | 186 MB | 3 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Aetrex Worldwide, Inc.](https://appshunter.io/developer/881021806) | [Pocket AI, Inc.](https://appshunter.io/developer/1722556734) |

## What reviewers say

### Aetrex Achilles

[App page](https://appshunter.io/ios/app/aetrex-achilles/id1536083899)

This app utilizes AI and computer vision to accurately measure your feet and determine your median shoe size. Future updates will offer personalized shoe recommendations based on your measurements.

**Highlights:** AI-powered foot measurement, Computer vision technology, Accurate median shoe size determination, Future shoe recommendations

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

**In-app purchases:** none


### Trax

[App page](https://appshunter.io/ios/app/trax-step-tracker/id6746829468)

This app tracks your daily steps and activity, encouraging movement with an "Active Hour" metric. It features a clean design, goal setting, and progress tracking along famous routes. It seamlessly integrates with Apple Health for comprehensive data.

**Highlights:** Step tracking, Active Hour measurement, Goal setting, Progress tracking on famous routes, Activity history sharing, Apple Health integration

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Aetrex Achilles free?

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

### Is Trax free?

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

### Which has better reviews, Aetrex Achilles or Trax?

Trax is rated higher. Aetrex Achilles averages 2.8 out of 5 from 34 ratings, while Trax averages 5.0 from 3 ratings.

### Do Aetrex Achilles or Trax have ads?

Neither Aetrex Achilles nor Trax shows ads.

### Which is updated more often, Aetrex Achilles or Trax?

Aetrex Achilles ships an update every 2 weeks, and Trax every 2 weeks. Most recently, Aetrex Achilles was updated on July 31, 2026 and Trax on September 9, 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.*