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AstroStacker: Stack the Sky

AstroStacker: Stack the Sky

Astrophotography on iPhone

7 ratings
11 reviews
📷 Photo & Video
Free
In-App Purchases

Details

Released
October 7, 2025
Updated
November 10, 2026

Features

Developer

Ahmed Al-Mahmud
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🧾$219.00
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About

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.

✓Stack multiple night sky photos
✓Automatic star alignment
✓Noise reduction for clearer images
✓Advanced editing tools
✓Support for calibration frames (Pro)
✓On-device processing
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+2

What's New in AstroStacker

2.1.1

November 10, 2026

New in 2.1.1 Photos go where you put them: the button you press (Lights, Darks, Flats or Bias) decides the group, so night photos no longer end up with your darks. When a stack can't find enough stars, the app now tells you why in plain words: photos sent through another app, a sky that's too bright, a shutter that's too fast, or only some photos with stars. A Contact us button sends us a note if it keeps happening. Each calibration type has its own icon. Thank you for every review. These fixes came from them. Clear skies.

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Subscriptions & In-App Purchases

AstroStacker app

a multi-platform astrophotography stacking application

$12.991 Month
3 Days trial
How to cancel AstroStacker subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

Doesn’t allow you to save

Shows a stacked image i could work with but wont save. The developer stated it would be fixed after the latest update, that was not the case. You still can’t save the stacked photo in the free version. Oh well, deleting.
XxSkulblaka

Response from developer

Sorry, you were right. In that version, saving could look like it did nothing, especially after editing the photo. The update that came out after your review fixes this, and the free plan saves your stacked photo to Photos. If it still won't save for you, email support@astrostacker.app and I'll sort it out. Rhu, Astro Stacker

Terrible.

This app won’t even process RAW or jpg photos. Gave me an error code for both. Not even worth downloading.
CColeC7

Response from developer

Sorry about that. Since your review we've fixed several problems with bringing photos in. JPG and HEIC photos stack on the free plan; RAW files need Pro. If a JPG still shows an error, email the error code to support@astrostacker.app and I'll look into it myself. Rhu, Astro Stacker

Doesn’t work at all

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
AFAstroshader needs fixing

Response from developer

Sorry about that. The app now tries again at a more sensitive setting before it says there aren't enough stars. You're right that the message sent you to a setting that isn't there; we've rewritten it, and that's in the next update. Tip: sharp photos of a clear, dark sky, taken one after another from the same spot, work best. Rhu, Astro Stacker

Would be great if it worked

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.
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HHedonisticHominin

Response from developer

Sorry about the crashes. Since your review we rebuilt how stacking works, and the crash partway through a stack is fixed. If the app gets closed mid-stack, it now carries on where it stopped. Please update and give it another go. If it still crashes, email support@astrostacker.app with your iPhone model and I'll help you myself. You can try it on the free plan without paying anything. Rhu, Astro Stacker

nope

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.
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FSforced shorts

Response from developer

Sorry about this. You can now keep using the free plan without paying, and stacking is much more reliable than when you tried it. If you'd like your money back, you can ask Apple at reportaproblem.apple.com. Rhu, Astro Stacker

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FAQ

What is AstroStacker used for?

AstroStacker is used to combine multiple photos of the night sky into a single, cleaner, and more detailed image. It helps reduce noise and bring out faint celestial objects like stars and the Milky Way.

How does AstroStacker work?

You take several photos of the same sky area from a stable surface, import them into the app, select a stacking mode, and tap 'Stack'. The app then aligns the stars and combines the images.

What are the different stacking modes in AstroStacker?

AstroStacker offers three modes: 'Quick' for a fast average, 'Quality' (default) which rejects outliers and weaker frames, and 'Max Detail' for the most selective and finest alignment.

Can I use calibration frames with AstroStacker?

Yes, calibration frames like darks, flats, dark-flats, and bias frames are available in the Pro version. These help correct issues like hot pixels, thermal noise, and vignetting.

What file formats can I import and export with AstroStacker?

The free version imports photos from your library. The Pro version supports RAW, Apple ProRAW, and FITS import, and exports JPG, PNG, TIFF, and FITS, with 16-bit export available.

Is AstroStacker available on Android?

Based on the provided data, AstroStacker is supported on iPhone and iPad, indicating it is an iOS-exclusive application.

What is the user rating for AstroStacker?

AstroStacker has a user rating of 1.1 stars based on 7 ratings.

How much does AstroStacker Pro cost?

AstroStacker Pro offers monthly ($12.99), annual ($99.99), and a one-time lifetime purchase ($219.00) option. Subscriptions include a 3-day free trial.