# Charlotte Muller Method vs Engineered Strength

The clearest difference is in-app purchases: Charlotte Muller Method at none against Engineered Strength's 4. Charlotte Muller Method also leads on ads (none vs shown). Engineered Strength's advantage is update cadence (monthly vs every 8 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Engineered Strength sells 4 in-app purchases, starting at $8.99 per month. Charlotte Muller Method asks for nothing beyond the download.

Charlotte Muller Method ships an update every 8 months, Engineered Strength monthly. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Charlotte Muller Method | Engineered Strength |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Monthly** |
| Size | 394 MB | 90 MB |
| Requires iOS | 15.1 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [METHODIS](https://appshunter.io/developer/1781991410) | [Raymond Jones](https://appshunter.io/developer/1587907738) |

## What reviewers say

### Charlotte Muller Method

[App page](https://appshunter.io/ios/app/charlotte-muller-method/id6738706577)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Engineered Strength

[App page](https://appshunter.io/ios/app/engineered-strength/id6748325115)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription (Monthly) | $8.99 | per month |
| Subscription (Every 3 Months) | $14.99 | per 3 months |
| Subscription (Yearly) | $24.99 | per year |
| Remove Ads | $7.99 | one-time |


## Frequently asked questions

### Is Charlotte Muller Method free?

Charlotte Muller Method is free to download, with no in-app purchases.

### Is Engineered Strength free?

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

### Do Charlotte Muller Method or Engineered Strength have ads?

Engineered Strength shows ads; Charlotte Muller Method does not.

### Which is updated more often, Charlotte Muller Method or Engineered Strength?

Charlotte Muller Method ships an update every 8 months, and Engineered Strength monthly. Most recently, Charlotte Muller Method was updated on October 25, 2026 and Engineered Strength 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.*