Comparison

Images Classifier vs Image Stack

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

Head to head
About

Images Classifier

Features
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Images Classifier enables you to identify and group images using your iPhone or iPad with custom-trained machine learning models. The app includes a built-in model, FruitsClassifier.mlmodel, which detects 8 different types of fruits using a neural network. Features: • Automatically group images into category folders, accessible via the Files app • Preview grouped images within the app • Set a classification confidence threshold - images below this value are grouped under "Other" • Load and run custom machine learning models from your library • Rename or delete models directly from the library Grouped images are saved in the Files app under: [Images Classifier / Images] To Add a Custom Model: Download a pre-trained .mlmodel file and place it in: [Images Classifier / MLModel] via AirDrop You can also train your own model using tools like CreateML or TensorFlow (models must be converted to .mlmodel format) Custom Model Tips: For example, if your model classifies 5 dog breeds - Husky, Bulldog, Golden Retriever, German Shepherd, and Beagle—it will perform accurately for those. However, classifying an unfamiliar breed like Boxer may result in incorrect predictions (e.g., classified as Bulldog). To improve results, include as many relevant classes as possible when training your model. Usage Examples: • Group plant species images in the jungle using a custom-trained model • Identify and sort dog breeds with a trained model • Classify and group wildlife or insect species • Detect and categorize defective products • And many more use cases - limited only by your creativity Quick Start Guide: 1. AirDrop your .mlmodel file (e.g., DogBreedsModel.mlmodel) into: [Images Classifier / MLModel] via the Files app 2. Launch the Images Classifier app 3. Open the Library tab and select your model (e.g., DogBreedsModel.mlmodel) 4. Load images from your Camera Roll 5. Tap Run and wait for processing to complete 6. Tap Result to view categorized images 7. Access all grouped images in the Files app under: [Images Classifier / Images] [*] Make sure your model is specifically trained for image classification (not object detection or other ML types). What is Image Classification? Image classification is the process of identifying and labeling groups of pixels or vectors within an image using predefined rules. It's a supervised learning task where a model is trained to recognize specific target classes using labeled sample images. Early computer vision models used raw pixel data as input, and this foundation still powers many modern classification techniques. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

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
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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!

Screenshots

Images Classifier4 screens
Image Stack4 screens

Verdict

The call

The clearest difference is price: Image Stack at Free against Images Classifier's $2.99. Image Stack also leads on update cadence (monthly vs every 38 months). Images Classifier's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 18.0). On 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

Image Stack is free to download; Images Classifier costs $2.99 up front. Image Stack sells 1 one-off in-app purchase. Images Classifier asks for nothing beyond the download.

UpkeepUpdate frequency

Images Classifier ships an update every 38 months, Image Stack monthly. The most recent releases landed on October 17, 2026 and October 15, 2026 respectively.

Scorecard4 real differences · 4 level
Images Classifier versus Image Stack: the parameters behind the verdict, then further details
ParameterImages ClassifierImage Stack
Price$2.99Free — better
Positive reviews—100.0% of reviews
Update frequencyEvery 38 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS12.0 — better18.0
Further details — not scored
Size10 MB13 MB
Age rating4+4+
DeveloperHeng Jia LiangDaniel Witt

In-app purchases

None

Images Classifier

No in-app purchases

1 purchases

Image Stack

One-time1
  • Full Version$9.99

Questions

Is Images Classifier free?
Images Classifier costs $2.99, with no in-app purchases.
Is Image Stack free?
Image Stack is free to download, with in-app purchases available.
Do Images Classifier or Image Stack have ads?
Neither Images Classifier nor Image Stack shows ads.
Which is updated more often, Images Classifier or Image Stack?
Images Classifier ships an update every 38 months, and Image Stack monthly. Most recently, Images Classifier was updated on October 17, 2026 and Image Stack on October 15, 2026.

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