# Aetrex Achilles vs AvaSci

The clearest difference is rating: AvaSci at 5.0 against Aetrex Achilles's 2.8. AvaSci also leads on update cadence (every 5 days vs every 2 weeks) and iOS requirement (13.0 vs 15.6). Aetrex Achilles's advantage is in-app purchases (none vs 2) and ratings volume (34 vs 2). On price, ads and device support there is nothing between them.

Both are free to download. AvaSci sells 2 in-app purchases, starting at $0.99 per month. Aetrex Achilles asks for nothing beyond the download.

AvaSci 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 2, so its average is the more settled of the two.

Aetrex Achilles ships an update every 2 weeks, AvaSci every 5 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Aetrex Achilles | AvaSci |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.8 (34 ratings)](https://appshunter.io/ios/app/aetrex-achilles/id1536083899/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/avasci/id6477493063/reviews)** |
| Number of ratings | **34** | 2 |
| Positive reviews | 22.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 186 MB | 378 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Aetrex Worldwide, Inc.](https://appshunter.io/developer/881021806) | [Avasci LLC](https://appshunter.io/developer/1729465694) |

## 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


### AvaSci

[App page](https://appshunter.io/ios/app/avasci/id6477493063)

This app uses patented motion capture and AI to precisely measure joint function, revealing details imperceptible to the human eye. It offers an easy-to-use interface to revolutionize how human body movement is analyzed. The app is free to download and use.

**Highlights:** Motion capture technology, Artificial intelligence analysis, Detailed joint function measurement, Easy-to-use interface, Revolutionary movement analysis

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |
| Yearly Subscription | $99.99 | per year |


## Frequently asked questions

### Is Aetrex Achilles free?

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

### Is AvaSci free?

AvaSci is free to download, with in-app purchases available.

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

AvaSci is rated higher. Aetrex Achilles averages 2.8 out of 5 from 34 ratings, while AvaSci averages 5.0 from 2 ratings.

### Do Aetrex Achilles or AvaSci have ads?

Neither Aetrex Achilles nor AvaSci shows ads.

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

Aetrex Achilles ships an update every 2 weeks, and AvaSci every 5 days. Most recently, Aetrex Achilles was updated on November 3, 2026 and AvaSci on November 4, 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.*