# AstroOcular vs Zenith Annotation

The clearest difference is in-app purchases: AstroOcular at none against Zenith Annotation's 2. Zenith Annotation's advantage is update cadence (every 10 days vs every 5 weeks) and device support (3 vs 1). On price and ads there is nothing between them.

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

AstroOcular ships an update every 5 weeks, Zenith Annotation every 10 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | AstroOcular | Zenith Annotation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 10 days** |
| Size | 2 MB | 47 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Aron Scolaro](https://appshunter.io/developer/931012278) | [Eduardo Martinez Gomez](https://appshunter.io/developer/6790600757) |

## What reviewers say

### AstroOcular

[App page](https://appshunter.io/ios/app/astroocular/id6777107628)

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

**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 AstroOcular free?

AstroOcular 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 AstroOcular or Zenith Annotation have ads?

Neither AstroOcular nor Zenith Annotation shows ads.

### Which is updated more often, AstroOcular or Zenith Annotation?

AstroOcular ships an update every 5 weeks, and Zenith Annotation every 10 days. Most recently, AstroOcular was updated on October 31, 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.*