# Engineered Strength vs Shift Fuel

The clearest difference is ads: Shift Fuel at none against Engineered Strength's shown. Engineered Strength's advantage is update cadence (monthly vs every 5 months) and iOS requirement (14.0 vs 26.4). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Engineered Strength sells 4 in-app purchases, starting at $8.99 per month and Shift Fuel sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Engineered Strength ships an update monthly, Shift Fuel every 5 months. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Engineered Strength | Shift Fuel |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 5 months |
| Size | 90 MB | 16 MB |
| Requires iOS | **14.0** | 26.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Raymond Jones](https://appshunter.io/developer/1587907738) | [Monarch Labs Collective](https://appshunter.io/developer/1891368463) |

## What reviewers say

### 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 |


### Shift Fuel

[App page](https://appshunter.io/ios/app/shift-fuel/id6772874868)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Shift Fuel Pro Monthly | $2.99 | per month |
| Shift Fuel Pro Yearly | $14.99 | per year |


## Frequently asked questions

### Is Engineered Strength free?

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

### Is Shift Fuel free?

Shift Fuel is free to download, with in-app purchases available.

### Do Engineered Strength or Shift Fuel have ads?

Engineered Strength shows ads; Shift Fuel does not.

### Which is updated more often, Engineered Strength or Shift Fuel?

Engineered Strength ships an update monthly, and Shift Fuel every 5 months. Most recently, Engineered Strength was updated on October 30, 2026 and Shift Fuel on October 28, 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.*