J vs GaitMetrics
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
J
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.
- 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
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Enhance your juggling practice! The J-Trainer app will give you tools to ensure that your juggling practice sessions include proper warmup, practice, and cool down. The interval training portion of the J-Trainer tool allows you to build customized workouts to ensure you spend the right amount of practice time on each section of your practice. Most juggling festivals include endurance contests like: club balance endurance, 5 ball endurance, 5 club endurance, and quarter juggling endurance. The Talking Timer feature of the J-trainer gives you verbal feedback on your endurance, so you don't have to look down at your stop watch. ---------------------------- No advertisements and no in app purchases are contained in this app. ---------------------------- Other apps by this developer: Protect TD (Protect Tower Defense - Save the Animals) Math Tower Defense Eagle Mandarin Mandarin Prof Math Town Spelling Ace Spy Town Spanish Prof ---------------------------- I hope you enjoy this app. Feel free to send me feedback if you have suggestions for future updates.
GaitMetrics
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GaitMetrics analyzes your walking patterns using your iPhone's motion sensors — no wearable needed. FREE: • Step count and cadence • Stride regularity score • Walking steadiness (0–100) • Session history with charts PRO ($2.99 one-time): • Walking speed with age-specific health ratings • Left-right step symmetry and asymmetry detection • Traffic-light ratings (green/yellow/red) for every metric • Plain-language insights explaining your results • PT/OT clinical tests: Timed Up & Go, 5x Sit-to-Stand, Single Leg Stance • Personalized exercise recommendations based on your gait profile • Injury recovery tracking for ACL, hip/knee replacement, ankle fractures, and more EVIDENCE-BASED Reference ranges are drawn from peer-reviewed research including the NIH Toolbox 4-Meter Walk Test, CADENCE-Adults Study, and the CDC STEADI fall-prevention program. WELLNESS ONLY GaitMetrics is a general wellness app. It is not a medical device and does not provide medical advice, diagnosis, or treatment. Always consult your physician or physical therapist for medical concerns.
Screenshots
Verdict
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.
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. 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.
| Parameter | J | GaitMetrics |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Monthly | Daily — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 19 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Heather Marriott | Andrew Meyers |
In-app purchases
J
No in-app purchases
GaitMetrics
- GaitMetrics Pro$2.99









