# AstroStacker vs AstroFITS

The clearest difference is rating: AstroFITS at 2.0 against AstroStacker's 1.1. AstroStacker's advantage is update cadence (every 2 weeks vs monthly) and ratings volume (7 vs 1). 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 AstroFITS sells 1 in-app purchase, starting at $0.99 per year. Whichever you choose, the download price is not the number that matters.

AstroFITS holds the better App Store score, 2.0 against 1.1. That said, the two scores are not equally well evidenced: AstroStacker has 7 ratings behind it against 1, so its average is the more settled of the two.

AstroStacker ships an update every 2 weeks, AstroFITS monthly. The most recent releases landed on November 12, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | AstroStacker | AstroFITS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.1 (7 ratings)](https://appshunter.io/ios/app/astrostacker-stack-the-sky/id6753679598/reviews) | **[2.0 (1 ratings)](https://appshunter.io/ios/app/astrofits/id6756322104/reviews)** |
| Number of ratings | **7** | 1 |
| Positive reviews | 0.0% 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 | 61 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ahmed Al-Mahmud](https://appshunter.io/developer/1844352476) | [yong chong loh](https://appshunter.io/developer/393466709) |

## 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 |


### AstroFITS

[App page](https://appshunter.io/ios/app/astrofits/id6756322104)

This app allows users to quickly open and view FITS files on iOS devices using GPU acceleration. It features automatic image stretching and supports various color formats and bit depths, making astronomical image analysis more accessible.

**Highlights:** Open FITS files quickly on iOS, GPU accelerated image processing, Automatic image stretching, Supports RGB and gray color, Handles multiple BITPIX formats, Save adjusted images to Photos

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yearly Subscription | $0.99 | per year |


## Frequently asked questions

### Is AstroStacker free?

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

### Is AstroFITS free?

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

### Which has better reviews, AstroStacker or AstroFITS?

AstroFITS is rated higher. AstroStacker averages 1.1 out of 5 from 7 ratings, while AstroFITS averages 2.0 from 1 ratings.

### Do AstroStacker or AstroFITS have ads?

Neither AstroStacker nor AstroFITS shows ads.

### Which is updated more often, AstroStacker or AstroFITS?

AstroStacker ships an update every 2 weeks, and AstroFITS monthly. Most recently, AstroStacker was updated on November 12, 2026 and AstroFITS on November 5, 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.*