# AstroStacker: Stack the Sky — user reviews > 11 indexed App Store user reviews of AstroStacker by Ahmed Al-Mahmud, rated 1.10/5 from 7 ratings. - Source: https://appshunter.io/ios/app/astrostacker-stack-the-sky/id6753679598/reviews - App overview in markdown: https://appshunter.io/ios/app/astrostacker-stack-the-sky/id6753679598.md - Rating breakdown: 5★ 0 · 4★ 0 · 3★ 0 · 2★ 1 · 1★ 6 ## Is AstroStacker safe? Not enough ratings yet to assess AstroStacker. ## Is AstroStacker legit? AstroStacker: Stack the Sky appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for AstroStacker is 73 out of 100 points across 7 verification signals from App Store and developer data. ## Most critical reviews (10 lowest-rated) ### 1/5 — Doesn’t allow you to save *2026-10-28* 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. **Developer response:** 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 ### 1/5 — Terrible. *2026-10-22* This app won’t even process RAW or jpg photos. Gave me an error code for both. Not even worth downloading. **Developer response:** 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 ### 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 **Developer response:** 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 ### 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:** 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 ### 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!! **Developer response:** 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. Rhu, Astro Stacker ### 1/5 — Crash. Crash. Crash *2026-01-21* Simply crashes every time you try to stack anything. Garbage. **Developer response:** 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. Rhu, Astro Stacker ### 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. **Developer response:** 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. Rhu, Astro Stacker ### 1/5 — All it does is crash *2025-12-09* If I could give it zero stars I would. **Developer response:** 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. Rhu, Astro Stacker ### 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:** 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 ### 3/5 — ooh ooh ahh ahh *2026-02-09* all these are the same person reviewing I balance it **Developer response:** Thanks for stopping by! If you try the app, I'd love to hear what you think. Rhu, Astro Stacker ## Most praised reviews (1 highest-rated) ### 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! **Developer response:** Thank you for sticking with it. Since your review, blending and lining up photos is much better, and the crashes with lots of photos are fixed. I hope it feels more polished now. Rhu, Astro Stacker --- *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 2026-11-12.*