# Core by RTI vs Grand Rhythmics

The clearest difference is in-app purchases: Grand Rhythmics at none against Core by RTI's 2. Grand Rhythmics also leads on iOS requirement (15.0 vs 17.6). Core by RTI's advantage is update cadence (every 3 weeks vs every 6 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Core by RTI sells 2 in-app purchases, starting at $8.99 per month. Grand Rhythmics asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Core by RTI against 5.0 for Grand Rhythmics. Both are backed by a comparable volume of ratings — 4 and 2 respectively.

Core by RTI ships an update every 3 weeks, Grand Rhythmics every 6 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Core by RTI | Grand Rhythmics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/core-by-rti/id6450906479/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/grand-rhythmics/id6751989065/reviews) |
| Number of ratings | **4** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | Subscription | **Free** |
| Size | 595 MB | 47 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mark Fitzgerald](https://appshunter.io/developer/477164822) | [Grand Rhythmic Gymnastics Academy](https://appshunter.io/developer/1837796163) |

## What reviewers say

### Core by RTI

[App page](https://appshunter.io/ios/app/core-by-rti/id6450906479)

This app serves as a comprehensive resource for figure skating, offering video demonstrations, tutorials, and diagrams. It's designed to support skaters, coaches, and parents in their figure skating journey, from beginner to advanced levels.

**Highlights:** Video demonstrations, Tutorials, Diagrams, Resource center, Skater guidance, Coach support

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Core by RTI | $8.99 | per month |
| Core by RTI | $89.99 | per year |


### Grand Rhythmics

[App page](https://appshunter.io/ios/app/grand-rhythmics/id6751989065)

Manage your gymnastics academy account, register for classes and events, and receive important updates. Access all academy offerings conveniently from your smartphone.

**Highlights:** Account management, Class registration, Event registration, Receive notifications, On-the-go access

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Core by RTI free?

Core by RTI is free to download, with in-app purchases available.

### Is Grand Rhythmics free?

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

### Which has better reviews, Core by RTI or Grand Rhythmics?

Core by RTI and Grand Rhythmics are both rated 5.0 out of 5 on the App Store, from 4 and 2 ratings respectively.

### Do Core by RTI or Grand Rhythmics have ads?

Neither Core by RTI nor Grand Rhythmics shows ads.

### Which is updated more often, Core by RTI or Grand Rhythmics?

Core by RTI ships an update every 3 weeks, and Grand Rhythmics every 6 months. Most recently, Core by RTI was updated on November 3, 2026 and Grand Rhythmics on October 30, 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.*