# Subtilizer vs Atkinson

The clearest difference is rating: Subtilizer at 5.0 against Atkinson's 3.3. Subtilizer also leads on in-app purchases (none vs 2) and ads (none vs shown). Atkinson's advantage is update cadence (monthly vs every 22 months). On price, ratings volume, device support and iOS requirement there is nothing between them.

Both are free to download. Atkinson sells 2 in-app purchases, starting at $0.99 per month. Subtilizer asks for nothing beyond the download.

Subtilizer holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 5 and 6 respectively. Written reviews point the same way: 100% of Subtilizer's written reviews are positive against 71% of Atkinson's.

Subtilizer ships an update every 22 months, Atkinson monthly. The most recent releases landed on September 15, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Subtilizer | Atkinson |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/subtilizer/id1386177976/reviews)** | [3.3 (6 ratings)](https://appshunter.io/ios/app/atkinson/id1569487124/reviews) |
| Number of ratings | 5 | **6** |
| Positive reviews | **100.0% of reviews** | 71.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 22 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 19 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Itoh Tomoaki](https://appshunter.io/developer/871816883) | [koyachi](https://appshunter.io/developer/413497532) |

## What reviewers say

### Subtilizer

[App page](https://appshunter.io/ios/app/subtilizer/id1386177976)

This application allows users to apply subtle image processing effects like posterization, detail filtering, and edge enhancement. It transforms images into a more refined aesthetic. The tool is designed for creative image manipulation.

**Highlights:** Posterization effect, Detail filtering, Edge enhancement, Subtle image conversion

**Features:** macOS Compatibility

**In-app purchases:** none


### Atkinson

[App page](https://appshunter.io/ios/app/atkinson/id1569487124)

This app processes photos using the Atkinson dithering algorithm, originally used for black and white displays on old Macintosh computers. It creates small file-sized images with options for square cropping, rounded corners, and white borders, offering a real-time preview of the effect.

**Highlights:** Atkinson dithering algorithm processing, Square photo output, Toggleable rounded corners, White border option, Real-time preview

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard Month | $0.99 | per month |
| Standard Year | $9.99 | per year |


## Frequently asked questions

### Is Subtilizer free?

Subtilizer is free to download, with no in-app purchases.

### Is Atkinson free?

Atkinson is free to download, with in-app purchases available.

### Which has better reviews, Subtilizer or Atkinson?

Subtilizer is rated higher. Subtilizer averages 5.0 out of 5 from 5 ratings, while Atkinson averages 3.3 from 6 ratings.

### Do Subtilizer or Atkinson have ads?

Atkinson shows ads; Subtilizer does not.

### Which is updated more often, Subtilizer or Atkinson?

Subtilizer ships an update every 22 months, and Atkinson monthly. Most recently, Subtilizer was updated on September 15, 2026 and Atkinson on October 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*