Aetrex Achilles vs Trax
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Aetrex Achilles
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.
- AI-powered foot measurement
- Computer vision technology
- Accurate median shoe size determination
- Future shoe recommendations
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The Achilles app uses AI and Computer Vision to measure your feet and determine your median shoe size accurately. A future version of this app will automatically provide recommendations of best fitting shoes for you.
Trax
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.
- Step tracking
- Active Hour measurement
- Goal setting
- Progress tracking on famous routes
- Activity history sharing
- Apple Health integration
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Trax is a simple, clean and modern step tracker. It is built to not only help people hit 10,000+ steps a day but also to help you understand when those steps are occurring. Our unique "Active Hour" measure (an hour with > 100 steps) encourages you to get up and move throughout the day. WHY TRAX: - Clear, uncluttered design makes it easy to see what you care about most - Easily set and adjust goals - Track your progress by completing the distance of famous routes such as the Appalachian Trail or the Silk Road - Track and share your full activity history - Integrated with Apple Health to combine data from your Apple Watch or other connected devices, share workouts and more ALWAYS ON, WORKS WITH THE PHONE YOU HAVE: - Always on and tracking, no need to press start and stop buttons - Works anywhere on your body - Works with any iPhone running iOS 16 or greater
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Aetrex Achilles | Trax |
|---|---|---|
| Price | Free | Free |
| Rating | 2.8 (34 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 22.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 34 — better | 3 |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 17.6 |
| Further details — not scored | ||
| Size | 186 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Aetrex Worldwide, Inc. | Pocket AI, Inc. |
Customer experience
Aetrex Achilles
Trax
In-app purchases
Aetrex Achilles
No in-app purchases
Trax
No in-app purchases
