Comparison

Image Stack vs Astrian Light

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Image Stack

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
Read full description

Image Stack converts images using presets to change formats, resize, rename, and more—whether you’re processing one image or thousands, everything is ready with just a few taps. KEY FEATURES • Batch convert images into modern formats • Apply one or more presets to avoid repetitive work • Rename files with prefixes, suffixes, or replacements • Resize images to match your requirements • Add overlays such as watermarks • Adjustable quality and metadata options • Drag-and-drop simplicity • Presets sync via iCloud for all your devices • Ultra-fast processing • Works on both macOS and iOS and iPadOS IDEAL FOR • Photographers organizing shoots • Designers exporting assets • Content creators preparing media • Anyone converting or renaming small or large image sets Image Stack is free to download and use. You can work with the app for as long as you like. To unlock the full experience and remove trial limits—such as the daily image limit—you can activate the full version with a one-time in-app purchase. The purchase is valid across all versions of Image Stack, including Mac, iPhone, and iPad. Is there any feature you are missing? Let me know!

About

Astrian Light

Plan your celestial photography with precise calculations for eclipses, golden hour, and astrophotography. Visualize the sky's events with your real horizon and location data. Includes tools for hyperfocal distance and exposure.

Highlights
  • Eclipse shadow mapping
  • Real horizon calculations
  • Golden and Blue Hour timing
  • Sky object identification
  • Trip planning tools
  • Photography calculators
  • Camera and lens gear saving
Features
Read full description

Astrian Light Other apps tell you when the Sun rises. This one tells you whether you’ll actually see it. Astrian Light takes into account the real terrain at the place where you’re going to shoot — a mountain, a ridge, the horizon in front of you — and calculates when you’ll actually see the Sun appear. Not when it should rise over a flat horizon. When you’ll see it from where you’ll be. WHAT IT TELLS YOU · When the best light starts at your location and how long it lasts. · Whether the terrain will block the sunrise, and until when. · How many hours of dark sky you’ll have tonight based on the Moon. · When the Milky Way core will be visible and where it will appear. · What an eclipse will look like from your location and when each phase will happen. YOUR GEAR, INSIDE ASTRIAN Add your cameras and lenses once. From then on, the calculators work with your actual gear: pinpoint-star exposure, hyperfocal distance, depth of field, field of view, filters, and timelapse. If you use an adapter, Astrian automatically calculates the effective focal length. PLAN BEFORE YOU GO Compare locations and nights before deciding where to set up your tripod. Save each plan with its location, date, and the gear you’re taking. Once you’re there, your calculations will still be available even without a signal. ECLIPSES, FREE FOREVER Explore the map of every eclipse, see how much of the Sun will be covered from any location, check the complete timeline, and find out whether the terrain on your horizon will let you see it. Everything related to eclipses is free. Now and always. REAL DATA, EVEN WHEN DATA IS MISSING Astrian doesn’t fill in the gaps with estimates without telling you. If terrain data isn’t available for a location, Astrian will tell you that the calculation is using a flat horizon. If a weather forecast isn’t available, you’ll know that too. If Astrian can’t know something, it tells you. SUBSCRIPTION Astrian Light is free for planning eclipses and checking the sky from your current location. The annual subscription unlocks planning for any date and location, along with your gear and the rest of the advanced tools. The subscription renews automatically until cancelled and can be managed at any time from your Apple Account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Image Stack4 screens
Astrian Light4 screens

Verdict

The call

The clearest difference is in-app purchases: Astrian Light at none against Image Stack's 1. Astrian Light also leads on update cadence (daily vs monthly). On price, review sentiment, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Image Stack sells 1 one-off in-app purchase. Astrian Light asks for nothing beyond the download.

UpkeepUpdate frequency

Image Stack ships an update monthly, Astrian Light daily. The most recent releases landed on September 29, 2026 and October 5, 2026 respectively.

Scorecard3 real differences · 7 level
Image Stack versus Astrian Light: the parameters behind the verdict, then further details
ParameterImage StackAstrian Light
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings—1 — better
Update frequencyMonthlyDaily — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS18.017.0 — better
Further details — not scored
Size13 MB38 MB
Age rating4+4+
DeveloperDaniel WittJavier Linero

Customer experience

Image Stack

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Astrian Light

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Image Stack

One-time1
  • Full Version$9.99
None

Astrian Light

No in-app purchases

Questions

Is Image Stack free?
Image Stack is free to download, with in-app purchases available.
Is Astrian Light free?
Astrian Light is free to download, with no in-app purchases.
Do Image Stack or Astrian Light have ads?
Neither Image Stack nor Astrian Light shows ads.
Which is updated more often, Image Stack or Astrian Light?
Image Stack ships an update monthly, and Astrian Light daily. Most recently, Image Stack was updated on September 29, 2026 and Astrian Light on October 5, 2026.

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