# Flexible Strength Academy vs Estira

The clearest difference is in-app purchases: Estira at none against Flexible Strength Academy's 1. Estira also leads on ads (none vs shown) and update cadence (every 10 days vs every 3 months). Flexible Strength Academy's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price there is nothing between them.

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

Flexible Strength Academy ships an update every 3 months, Estira every 10 days. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Flexible Strength Academy | Estira |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 10 days** |
| Size | 89 MB | 28 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Sebastiaan Pagano Mirani](https://appshunter.io/developer/1727741494) | [Alexander Amancio](https://appshunter.io/developer/1092692517) |

## What reviewers say

### 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 |


### Estira

[App page](https://appshunter.io/ios/app/estira/id6766697949)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flexible Strength Academy free?

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

### Is Estira free?

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

### Do Flexible Strength Academy or Estira have ads?

Flexible Strength Academy shows ads; Estira does not.

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

Flexible Strength Academy ships an update every 3 months, and Estira every 10 days. Most recently, Flexible Strength Academy was updated on October 16, 2026 and Estira on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*