# Flex vs Prerun

The clearest difference is update cadence: Prerun at weekly against Flex's every 3 months. Flex's advantage is iOS requirement (13.4 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Flex sells 2 in-app purchases, starting at $13.99 per month and Prerun sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Flex ships an update every 3 months, Prerun weekly. The most recent releases landed on October 25, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Flex | Prerun |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (1 ratings)](https://appshunter.io/ios/app/prerun-run-warmups-and-stretch/id6760158784/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | — | Freemium |
| Size | 70 MB | 94 MB |
| Requires iOS | **13.4** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 17+ | 12+ |
| Developer | [CAPNKLUTCH](https://appshunter.io/developer/1772032590) | [Melki Jonathan Andara](https://appshunter.io/developer/1813635822) |

## What reviewers say

### Flex

[App page](https://appshunter.io/ios/app/flex-stretch/id6736611703)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $13.99 | per month |
| Premium Annual | $39.99 | per year |


### Prerun

[App page](https://appshunter.io/ios/app/prerun-run-warmups-and-stretch/id6760158784)

This app provides guided routines to help runners properly warm up before each run. It offers dynamic stretches and clear timers to activate key running muscles, improving performance and reducing injury risk in just a few minutes.

**Highlights:** Guided warmup routines for runners, Quick 5-minute warmups, Dynamic running stretches, Clear countdown timers, Targeted muscle activation

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| English | $2.99 | per month |
| English | $12.99 | per year |
| English | $24.99 | one-time |


## Frequently asked questions

### Is Flex free?

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

### Is Prerun free?

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

### Do Flex or Prerun have ads?

Neither Flex nor Prerun shows ads.

### Which is updated more often, Flex or Prerun?

Flex ships an update every 3 months, and Prerun weekly. Most recently, Flex was updated on October 25, 2026 and Prerun on October 21, 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.*