# AstroStacker vs Image Stack

The clearest difference is review sentiment: Image Stack at 100% against AstroStacker's 0%. AstroStacker's advantage is update cadence (every 2 weeks vs monthly). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. AstroStacker sells 3 in-app purchases, starting at $12.99 per month and Image Stack sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

AstroStacker ships an update every 2 weeks, Image Stack monthly. The most recent releases landed on November 14, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | AstroStacker | Image Stack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.1 (7 ratings)](https://appshunter.io/ios/app/astrostacker-stack-the-sky/id6753679598/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Freemium | Free with in-app purchases |
| Size | 17 MB | 13 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Ahmed Al-Mahmud](https://appshunter.io/developer/1844352476) | [Daniel Witt](https://appshunter.io/developer/1438848391) |

## What reviewers say

### AstroStacker

[App page](https://appshunter.io/ios/app/astrostacker-stack-the-sky/id6753679598)

Enhance your night sky photos by stacking multiple exposures into a single, detailed image. This app automatically aligns stars, reduces noise, and offers tools to refine your astrophotography results directly on your iPhone or iPad.

**Highlights:** Stack multiple night sky photos, Automatic star alignment, Noise reduction for clearer images, Advanced editing tools, Support for calibration frames (Pro), On-device processing

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AstroStacker app | $12.99 | per month |
| AstroStacker app | $99.99 | per year |
| AstroStacker app | $219.00 | one-time |


### Image Stack

[App page](https://appshunter.io/ios/app/image-stack/id6757393848)

This app streamlines image processing by allowing batch conversion, resizing, and renaming. Apply presets, add watermarks, and adjust quality settings with ease. It's designed for efficient handling of multiple images across devices.

**Highlights:** Batch image conversion, Apply multiple presets, Rename files, Resize images, Add overlays/watermarks, Adjust quality and metadata, iCloud preset sync

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $9.99 | one-time |


## Frequently asked questions

### Is AstroStacker free?

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

### Is Image Stack free?

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

### Do AstroStacker or Image Stack have ads?

Neither AstroStacker nor Image Stack shows ads.

### Which is updated more often, AstroStacker or Image Stack?

AstroStacker ships an update every 2 weeks, and Image Stack monthly. Most recently, AstroStacker was updated on November 14, 2026 and Image Stack 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.*