# +Frames vs Zenith Annotation

The clearest difference is iOS requirement: Zenith Annotation at 15.0 against +Frames's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. +Frames sells 2 in-app purchases, starting at $3.99 per month and Zenith Annotation sells 2 in-app purchases, starting at $24.99 per year. Whichever you choose, the download price is not the number that matters.

+Frames ships an update every 2 weeks, Zenith Annotation every 10 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | +Frames | Zenith Annotation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/plus-frames/id6787722445/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 10 days** |
| Monetization | Freemium | — |
| Size | 748 MB | 47 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [LEVIN GIDEON MERANER](https://appshunter.io/developer/6787722447) | [Eduardo Martinez Gomez](https://appshunter.io/developer/6790600757) |

## What reviewers say

### +Frames

[App page](https://appshunter.io/ios/app/plus-frames/id6787722445)

This app helps astrophotographers plan their shots by providing a sky atlas, equipment-specific target recommendations, and field-of-view previews. It also offers an AI assistant for personalized advice and project tracking for deep-sky objects.

**Highlights:** Sky atlas with millions of stars and deep-sky objects, Ranked target recommendations based on equipment and sky conditions, True field-of-view preview for cameras and eyepieces, Mosaic planning up to 4x4, Project tracking for exposures and filters, AI assistant for personalized astrophotography advice, Augmented Reality (AR) mode for target location

**Features:** iPhone Duo support

**In-app purchases (2)**

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


### 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 +Frames free?

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

### Is Zenith Annotation free?

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

### Do +Frames or Zenith Annotation have ads?

Neither +Frames nor Zenith Annotation shows ads.

### Which is updated more often, +Frames or Zenith Annotation?

+Frames ships an update every 2 weeks, and Zenith Annotation every 10 days. Most recently, +Frames was updated on November 5, 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.*