# SunMax vs Stimly

The clearest difference is iOS requirement: SunMax at 15.0 against Stimly's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. SunMax sells 3 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.

SunMax ships an update every 5 days, Stimly every 8 days. The most recent releases landed on October 3, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | SunMax | Stimly |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 8 days |
| Size | 27 MB | 57 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Oliver Stojcevski](https://appshunter.io/developer/1829807990) | [Zen Media Mateusz Stys](https://appshunter.io/developer/6772148668) |

## What reviewers say

### SunMax

[App page](https://appshunter.io/ios/app/sunmax-vitamin-d-tracker/id6749281214)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Yearly | $39.99 | per year |
| SunMax Premium Lifetime | $69.99 | one-time |


### 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 SunMax free?

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

### Is Stimly free?

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

### Do SunMax or Stimly have ads?

Neither SunMax nor Stimly shows ads.

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

SunMax ships an update every 5 days, and Stimly every 8 days. Most recently, SunMax was updated on October 3, 2026 and Stimly on October 17, 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.*