# Hayley vs Stimly

The clearest difference is iOS requirement: Stimly at 17.0 against Hayley's 26.4. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Hayley sells 2 in-app purchases, starting at $4.99 per month and Stimly sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Hayley ships an update weekly, Stimly every 8 days. The most recent releases landed on October 9, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Hayley | Stimly |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 8 days |
| Size | 1 MB | 57 MB |
| Requires iOS | 26.4 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [SIRO Social Ltd](https://appshunter.io/developer/1460243091) | [Zen Media Mateusz Stys](https://appshunter.io/developer/6772148668) |

## What reviewers say

### Hayley

[App page](https://appshunter.io/ios/app/hayley/id6767863655)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hayley Monthly | $4.99 | per month |
| Hayley Annual | $44.99 | per year |


### Stimly

[App page](https://appshunter.io/ios/app/stimly-caffeine-tracker/id6772148666)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stimly Pro Monthly | $4.99 | per month |
| Stimly Pro Yearly | $39.99 | per year |


## Frequently asked questions

### Is Hayley free?

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

### Is Stimly free?

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

### Do Hayley or Stimly have ads?

Neither Hayley nor Stimly shows ads.

### Which is updated more often, Hayley or Stimly?

Hayley ships an update weekly, and Stimly every 8 days. Most recently, Hayley was updated on October 9, 2026 and Stimly on October 17, 2026.

---

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