# Sky Dose vs Seize Light

The clearest difference is ads: Sky Dose at none against Seize Light's shown. Sky Dose also leads on update cadence (every 4 days vs every 2 weeks). Seize Light's advantage is iOS requirement (18.0 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Sky Dose sells 2 in-app purchases, starting at $3.99 per month and Seize Light sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Sky Dose ships an update every 4 days, Seize Light every 2 weeks. The most recent releases landed on October 28, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Sky Dose | Seize Light |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Size | 51 MB | 39 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [besserly UG (haftungsbeschrankt)](https://appshunter.io/developer/1886013171) | [sebastian totte](https://appshunter.io/developer/1819107580) |

## What reviewers say

### Sky Dose

[App page](https://appshunter.io/ios/app/sky-dose-vitamin-d-tracker/id6760735495)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $3.99 | per month |
| Yearly | $29.99 | per year |


### Seize Light

[App page](https://appshunter.io/ios/app/seize-light/id6784576883)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is Sky Dose free?

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

### Is Seize Light free?

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

### Do Sky Dose or Seize Light have ads?

Seize Light shows ads; Sky Dose does not.

### Which is updated more often, Sky Dose or Seize Light?

Sky Dose ships an update every 4 days, and Seize Light every 2 weeks. Most recently, Sky Dose was updated on October 28, 2026 and Seize Light on November 10, 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.*