# J vs GaitMetrics

The clearest difference is in-app purchases: J at none against GaitMetrics's 1. J also leads on iOS requirement (12.2 vs 17.0). GaitMetrics's advantage is update cadence (daily vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. GaitMetrics sells 1 one-off in-app purchase. J asks for nothing beyond the download.

J ships an update monthly, GaitMetrics daily. The most recent releases landed on October 10, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | J | GaitMetrics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/j-trainer/id1469085063/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Daily** |
| Monetization | Free | — |
| Size | 19 MB | 3 MB |
| Requires iOS | **12.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Heather Marriott](https://appshunter.io/developer/919616194) | [Andrew Meyers](https://appshunter.io/developer/1879595732) |

## What reviewers say

### J

[App page](https://appshunter.io/ios/app/j-trainer/id1469085063)

This app provides tools to structure your juggling practice sessions, including warm-up, practice, and cool-down routines. It features interval training for customized workouts and a talking timer for endurance practice, offering verbal feedback without needing to check your stopwatch.

**Highlights:** Structured practice routines (warm-up, practice, cool-down), Customizable interval training workouts, Talking timer for endurance practice, Verbal feedback for endurance contests, Ad-free experience

**Features:** macOS Compatibility

**In-app purchases:** none


### GaitMetrics

[App page](https://appshunter.io/ios/app/gaitmetrics/id6762646283)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GaitMetrics Pro | $2.99 | one-time |


## Frequently asked questions

### Is J free?

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

### Is GaitMetrics free?

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

### Do J or GaitMetrics have ads?

Neither J nor GaitMetrics shows ads.

### Which is updated more often, J or GaitMetrics?

J ships an update monthly, and GaitMetrics daily. Most recently, J was updated on October 10, 2026 and GaitMetrics on October 25, 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.*