# BellyDanceCore by Mariam vs Koi Shape

The clearest difference is ads: BellyDanceCore by Mariam at none against Koi Shape's shown. Koi Shape's advantage is update cadence (monthly vs every 4 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BellyDanceCore by Mariam ships an update every 4 months, Koi Shape monthly. The most recent releases landed on September 15, 2026 and July 27, 2026 respectively.

## The numbers

| Metric | BellyDanceCore by Mariam | Koi Shape |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Monthly** |
| Size | 121 MB | 26 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Sutra Fitness, Inc.](https://appshunter.io/developer/914371834) | [QUY DIEN LE](https://appshunter.io/developer/1745588028) |

## What reviewers say

### BellyDanceCore by Mariam

[App page](https://appshunter.io/ios/app/bellydancecore-by-mariam/id1641333635)

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

**In-app purchases:** none


### Koi Shape

[App page](https://appshunter.io/ios/app/koi-shape/id6745516636)

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

**In-app purchases:** none


## Frequently asked questions

### Is BellyDanceCore by Mariam free?

BellyDanceCore by Mariam is free to download, with no in-app purchases.

### Is Koi Shape free?

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

### Do BellyDanceCore by Mariam or Koi Shape have ads?

Koi Shape shows ads; BellyDanceCore by Mariam does not.

### Which is updated more often, BellyDanceCore by Mariam or Koi Shape?

BellyDanceCore by Mariam ships an update every 4 months, and Koi Shape monthly. Most recently, BellyDanceCore by Mariam was updated on September 15, 2026 and Koi Shape on July 27, 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.*