# Muscle Stack vs Let's 45

The clearest difference is ads: Let's 45 at none against Muscle Stack's shown. Let's 45 also leads on update cadence (every 12 months vs every 29 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.

Muscle Stack ships an update every 29 months, Let's 45 every 12 months. The most recent releases landed on September 21, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Muscle Stack | Let's 45 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 29 months | **Every 12 months** |
| Size | 84 MB | 81 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [omer cetin](https://appshunter.io/developer/1584332419) | [VIET NAM YDC COMPANY LIMITED](https://appshunter.io/developer/945505939) |

## What reviewers say

### Muscle Stack

[App page](https://appshunter.io/ios/app/muscle-stack/id1604565712)

**Features:** macOS Compatibility

**In-app purchases:** none


### Let's 45

[App page](https://appshunter.io/ios/app/lets-45-number-games/id1669727028)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Muscle Stack free?

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

### Is Let's 45 free?

Let's 45 is free to download, with no in-app purchases.

### Do Muscle Stack or Let's 45 have ads?

Muscle Stack shows ads; Let's 45 does not.

### Which is updated more often, Muscle Stack or Let's 45?

Muscle Stack ships an update every 29 months, and Let's 45 every 12 months. Most recently, Muscle Stack was updated on September 21, 2026 and Let's 45 on September 13, 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.*