# Strength in Us vs Sub20

The clearest difference is update cadence: Sub20 at every 3 days against Strength in Us's every 5 months. Sub20 also leads on device support (4 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Strength in Us sells 2 in-app purchases, starting at $34.99 per month and Sub20 sells 1 in-app purchase, starting at $24.99 per month. Whichever you choose, the download price is not the number that matters.

Strength in Us ships an update every 5 months, Sub20 every 3 days. Both last shipped on September 29, 2026.

## The numbers

| Metric | Strength in Us | Sub20 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 days** |
| Size | 112 MB | 10 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Sarah Catterson](https://appshunter.io/developer/1726137180) | [Chris Edgar](https://appshunter.io/developer/6775813655) |

## What reviewers say

### Strength in Us

[App page](https://appshunter.io/ios/app/strength-in-us/id6749434004)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Active | $34.99 | per month |
| Active Plus | $49.99 | per month |


### Sub20

[App page](https://appshunter.io/ios/app/sub20-5k-running-coach/id6775813653)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sub20 Monthly | $24.99 | per month |


## Frequently asked questions

### Is Strength in Us free?

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

### Is Sub20 free?

Sub20 is free to download, with in-app purchases available.

### Do Strength in Us or Sub20 have ads?

Neither Strength in Us nor Sub20 shows ads.

### Which is updated more often, Strength in Us or Sub20?

Strength in Us ships an update every 5 months, and Sub20 every 3 days. Most recently, Strength in Us was updated on September 29, 2026 and Sub20 on September 29, 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.*