# Astro Stacker: Star Images — Stack Images, Reveal Stars

> Advanced image stacking for astrophotography on mobile devices. (iPhone/iPad app by Ahmed Al-Mahmud.)

- Source: https://appshunter.io/ios/app/astro-stacker-star-images/id6753679598 (this page in markdown: same URL + `.md`)
- Developer: [Ahmed Al-Mahmud](https://appshunter.io/developer/1844352476)
- Category: Photo & Video
- Price: Free with in-app purchases
- Rating: 1.00/5 from 4 App Store ratings · 9 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 16 MB
- Languages: English
- Released: 2025-10-07
- Data updated: 2026-09-09
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/astro-stacker-star-images/id6753679598/reviews.md

## What is Astro Stacker?

ASTRO STACKER - Professional Image Stacking for Astrophotography

Turn your smartphone into a powerful astrophotography tool! Astro Stacker uses advanced image stacking algorithms to combine multiple photos of the night sky, dramatically reducing noise and revealing celestial details invisible to the naked eye.

PERFECT FOR:
- Amateur astronomers capturing the Milky Way
- Astrophotography enthusiasts shooting deep space objects
- Stargazers photographing planets and constellations
- Night sky photographers wanting professional results

KEY FEATURES:

ADVANCED STACKING ALGORITHMS
- Average Stacking - Reduce noise by averaging pixel values
- Median Stacking - Remove satellites and airplane trails automatically
- Maximum Stacking - Capture the brightest stars and details
- Minimum Stacking - Eliminate hot pixels and artifacts

INTELLIGENT ALIGNMENT
- Feature Detection - Automatically align stars across images
- Center of Mass - Perfect for tracking celestial objects
- Manual alignment options for precise control
- Handles slight camera movement between shots

REAL-TIME PROCESSING
- Live progress tracking with detailed logs
- See exactly what's happening during processing
- Parallel processing for maximum speed
- Works entirely on-device - no cloud upload needed

PROFESSIONAL RESULTS
- Export high-resolution stacked images
- Preserve original image quality
- Compare before/after results
- Share directly to social media or save to Photos

PROCESSING INSIGHTS
- View detailed processing logs
- Track alignment accuracy
- Monitor stacking progress in real-time
- Understand how each image contributes

HOW IT WORKS:
1. Take 5-15 photos of the same night sky scene (use a tripod for best results)
2. Import images from your photo library
3. Select your stacking method and alignment technique
4. Watch as Astro Stacker combines your images
5. Export your noise-free, detail-rich astrophoto

TIPS FOR BEST RESULTS:
- Use a tripod or stable surface
- Take 8-15 images of the same scene
- Keep exposure settings consistent
- Focus on stars or your main subject
- Shoot in RAW format if possible

NO SUBSCRIPTION REQUIRED
Pay once, stack unlimited images forever. All processing happens on your device - your photos never leave your phone.

PRIVACY FIRST
- No account required
- No data collection
- No cloud processing
- Complete offline functionality

Whether you're capturing the Andromeda Galaxy, the Orion Nebula, or simply want cleaner Milky Way shots, Astro Stacker gives you professional astrophotography results right on your iPhone.

Download now and reveal the hidden universe in your night sky photos!

Privacy Policy: https://www.spacesss.com/apps/privacy
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Terms & Conditions:  https://www.spacesss.com/apps/terms-and-conditions

## Key features

- Advanced stacking algorithms (Average, Median, Maximum, Minimum)
- Intelligent and manual image alignment
- Real-time processing and progress tracking
- On-device processing, no cloud upload
- Export high-resolution stacked images
- Detailed processing insights and logs

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| AstroStacker app | $12.99 | per month |
| AstroStacker app | $99.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| AstroStacker app | $219.00 | one-time |


## Recent user reviews (9 of 9)

All indexed reviews: https://appshunter.io/ios/app/astro-stacker-star-images/id6753679598/reviews.md

### 1/5 — Doesn’t work at all

*2026-08-24*

I try to put an image and it says not enough stars found, so I put a image with more stars and it says not enough stars found, also there is no configuration setting like it says on the crash screen

### 1/5 — Would be great if it worked

*2026-06-17*

This app has the potential to be the best for astrophotography and image stacking if it actually stacked your images without crashing. There are a multitude of settings and adjustments that you could make that you wouldn’t find anywhere else and it’s layout is great but anytime I attempt to stack any number of images (even two on the lowest settings), every time it gets to 65% it automatically crashes. I’m not willing to jeopardize any money on upgrading my free subscription to find out if it works then I doubt it. Make it work and it’d be well worth the money though.

**Developer response:** hi thanks for your feedback, we had some issues with that version and have since upgraded it please check it out would love to offer you some more credits to really test all the settings!

### 2/5 — nope

*2026-05-12*

App makes it so you sorta have to pick a paid option to do anything. tapping ‘free’ when a paid/free choice pops up does not work. I paid the seven bucks. It isnt worth the seven bucks I paid for it. Now I have to wait for it to show up on my itunes account or whatever to request a refund. It isnt siril. It isnt pixinsight. It couldnt produce results with known good input. skip it. would have rated it one start except nobody takes a one start serious.

**Developer response:** hi, sorrya bout the experience you had since then we were able to make the free tier more flexible with more options available, hope you can give it another go

### 1/5 — ?

*2026-03-15*

Please help I tried a lot and all the app does is crash. If this is fixed then that would be amazing, since I REALLY want a mobile stacking app.
PLEASE fix this!!

### 3/5 — ooh ooh ahh ahh

*2026-02-09*

all these are the same person reviewing I balance it

### 1/5 — Crash.  Crash.  Crash

*2026-01-21*

Simply crashes every time you try to stack anything.  Garbage.

### 1/5 — All it does is crash.

*2025-12-16*

I had to put one star to leave a review but all this app does is crash.

### 3/5 — Good app, needs polishing

*2025-12-14*

Ive dealt with it since ios 26 came out and well it is a decent app, it needs more polishing on the merging of the pictures and the alignment, sometimes it closes when theres a lot of pictures but it is acceptable since there’s no other apps like these
Its a decent one, just needs some polishing!

### 1/5 — All it does is crash

*2025-12-09*

If I could give it zero stars I would.

## Frequently asked questions about Astro Stacker

### What is Astro Stacker used for?

Astro Stacker is used to combine multiple photos of the night sky to reduce noise and enhance details, producing professional-quality astrophotographs directly on your smartphone.

### Does Astro Stacker have ads?

No, Astro Stacker is ad-free. The app is completely free to use and does not contain any advertisements.

### What are the different stacking methods in Astro Stacker?

Astro Stacker offers Average Stacking to reduce noise, Median Stacking to remove trails, Maximum Stacking for bright details, and Minimum Stacking to eliminate artifacts.

### Can I align images manually in Astro Stacker?

Yes, Astro Stacker provides manual alignment options for precise control, in addition to its intelligent feature detection and Center of Mass alignment.

### Does Astro Stacker require an internet connection?

No, Astro Stacker works entirely on-device and offers complete offline functionality. Your photos are never uploaded to the cloud for processing.

### What devices is Astro Stacker compatible with?

Astro Stacker is compatible with iPhone and iPad devices.

### What is the age rating for Astro Stacker?

Astro Stacker has an age rating of 4+, making it suitable for a wide range of users.

### How often is Astro Stacker updated?

Astro Stacker was last updated on October 7, 2025, with version 1.0. Future updates will likely continue to improve its features and performance.

## Version history (last 5 releases)

### 2.0.6 — 2026-09-05

This update focuses on stacking reliability:

• Significantly improved RAW photo processing (CR2, CR3, NEF, ARW, DNG, RAF) so faint stars are detected more accurately
• Stacking now automatically retries at a more sensitive setting instead of failing outright when few stars are found
• If a stack gets interrupted, AstroStacker can now resume instead of starting over from scratch
• Added a clear warning before backgrounding the app during a stack, since doing so will cancel it
• New heads-up when importing photos that may not have enough star data to stack, such as screenshots or heavily compressed images
• Various stability and bug fixes

### 2.0.5 — 2026-08-19

Astro Stacker 2.0.5 brings clearer results and a smoother experience:

• More reliable FITS importing, processing and 16-bit output  
• Improvements to stacking stability, image orientation and overall performance
• New Local Contrast controls to reveal more detail  
• Faster previews while adjusting your image  
• Private backup for new finished results when signed in, with full quality master backups for Pro

### 2.0.4 — 2026-07-09

This update is all about reliability and a smoother editing experience:

• Fixed image import — selecting photos from your Photo Library or Files now imports reliably, every time. If something can't load, you'll get a clear message instead of a silent failure.

• Faster, more stable post-processing — one-tap style presets (Natural, Nebula Pop, Cosmic Drama, Scientific) now each give your image a distinctly different look, with a live preview as you tune.

• Redesigned Analysis screen for a cleaner overview of your dataset before stacking.

• Clearer next steps after stacking, with quick access to post-processing, save, and export.

• Improved account sign-in so your stacking history and Pro subscription stay tied to your account and sync across your devices.

• In-app feedback now sends reliably — tell us anything via Settings → Send Feedback.

• Various bug fixes and performance improvements.

Thanks to everyone who reported issues — this release fixes several of them directly. Clear skies!

### 2.0.3 — 2026-06-25

Smarter stacking: mismatched photo sizes now auto-resolve, clearer error messages, and accurate Pro pricing every time. Stack with confidence.

### 2.0.2 — 2026-06-19

2.0.2 — Stability & Export Upgrade

Rock-Solid Stacking • Fixed crashes that could occur when stacking with different modes and mixed frame sizes • Smart auto-filtering now detects and removes mismatched resolutions automatically — no more black frames or unexpected errors • Improved error messages so you know exactly what happened if something goes wrong

Export Made Easy • Save to Photos and Export buttons are now always visible on the result screen — no more hunting through menus • One tap to save, one tap to share as PNG or FIITS

Subscription & Pricing • Plan prices now display correctly in all regions

Under the Hood • Hardened the image pipeline with additional safety checks for FITS files and edge-case frame data • Improved memory handling during large stacks

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## More apps by Ahmed Al-Mahmud

- [WidgetGPT: Interface AI](https://appshunter.io/ios/app/widgetgpt-interface-ai/id6755014996)
- [AI Shortcuts Builder](https://appshunter.io/ios/app/ai-shortcuts-builder/id6755172604)

All apps by Ahmed Al-Mahmud: https://appshunter.io/developer/1844352476

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-09.*