# Star Exposure Calculator vs Zenith Annotation

The clearest difference is in-app purchases: Star Exposure Calculator at none against Zenith Annotation's 2. Star Exposure Calculator also leads on iOS requirement (13.0 vs 15.0). Zenith Annotation's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Zenith Annotation sells 2 in-app purchases, starting at $24.99 per year. Star Exposure Calculator asks for nothing beyond the download.

Star Exposure Calculator ships an update every 2 weeks, Zenith Annotation every 10 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Star Exposure Calculator | Zenith Annotation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 10 days** |
| Size | 25 MB | 47 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Dejan Boras](https://appshunter.io/developer/1612985659) | [Eduardo Martinez Gomez](https://appshunter.io/developer/6790600757) |

## What reviewers say

### Star Exposure Calculator

[App page](https://appshunter.io/ios/app/star-exposure-calculator/id6670283794)

**Features:** macOS Compatibility

**In-app purchases:** none


### Zenith Annotation

[App page](https://appshunter.io/ios/app/zenith-annotation/id6816010913)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annotation Studio with Trial | $24.99 | per year |
| Annotation Studio Annual | $24.99 | per year |


## Frequently asked questions

### Is Star Exposure Calculator free?

Star Exposure Calculator is free to download, with no in-app purchases.

### Is Zenith Annotation free?

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

### Do Star Exposure Calculator or Zenith Annotation have ads?

Star Exposure Calculator shows ads; Zenith Annotation does not.

### Which is updated more often, Star Exposure Calculator or Zenith Annotation?

Star Exposure Calculator ships an update every 2 weeks, and Zenith Annotation every 10 days. Most recently, Star Exposure Calculator was updated on October 30, 2026 and Zenith Annotation on October 31, 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.*