# Double Shift vs Flexible Strength Academy

The clearest difference is in-app purchases: Double Shift at none against Flexible Strength Academy's 1. Double Shift also leads on update cadence (every 5 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Flexible Strength Academy sells 1 in-app purchase, starting at $8.99 per month. Double Shift asks for nothing beyond the download.

Double Shift ships an update every 5 weeks, Flexible Strength Academy every 3 months. The most recent releases landed on October 3, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Double Shift | Flexible Strength Academy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Size | 123 MB | 89 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [The Turn Holding BV](https://appshunter.io/developer/1621271915) | [Sebastiaan Pagano Mirani](https://appshunter.io/developer/1727741494) |

## What reviewers say

### Double Shift

[App page](https://appshunter.io/ios/app/double-shift/id1621271913)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Flexible Strength Academy

[App page](https://appshunter.io/ios/app/flexible-strength-academy/id6476779145)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FSA membership | $8.99 | per month |


## Frequently asked questions

### Is Double Shift free?

Double Shift is free to download, with no in-app purchases.

### Is Flexible Strength Academy free?

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

### Do Double Shift or Flexible Strength Academy have ads?

Both Double Shift and Flexible Strength Academy show ads.

### Which is updated more often, Double Shift or Flexible Strength Academy?

Double Shift ships an update every 5 weeks, and Flexible Strength Academy every 3 months. Most recently, Double Shift was updated on October 3, 2026 and Flexible Strength Academy on October 1, 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.*