# Atkinson vs ca

The clearest difference is price: Atkinson at Free against ca's $2.99. ca's advantage is rating (4.8 vs 3.3) and in-app purchases (none vs 2). On update cadence and device support there is nothing between them.

Atkinson is free to download; ca costs $2.99 up front. Atkinson sells 2 in-app purchases, starting at $0.99 per month. ca asks for nothing beyond the download.

ca holds the better App Store score, 4.8 against 3.3. That said, the two scores are not equally well evidenced: ca has 52 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 71% of Atkinson's written reviews are positive against 89% of ca's.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 4, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Atkinson | ca |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [3.3 (6 ratings)](https://appshunter.io/ios/app/atkinson/id1569487124/reviews) | **[4.8 (52 ratings)](https://appshunter.io/ios/app/ca-mera-plus/id1616228106/reviews)** |
| Number of ratings | 6 | **52** |
| Positive reviews | 71.4% of reviews | **88.9% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | Monthly |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | — | **#198** |
| Size | 19 MB | 2 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [koyachi](https://appshunter.io/developer/413497532) | [Fritz Menzer](https://appshunter.io/developer/512896637) |

## What reviewers say

### 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 |


### ca

[App page](https://appshunter.io/ios/app/ca-mera-plus/id1616228106)

**Currently charting:** #198 Top Paid · Photo & Video (US App Store)

This app transforms your camera's live feed into unique, pixelated images and videos using cellular automata. Customize patterns with various color palettes, directions, rules, and resolutions for a retro aesthetic.

**Highlights:** Cellular automaton image interpretation, Pixelated output with unique patterns, Black and white or retro color palettes, Selfie and split camera modes, Video recording, Customizable automaton parameters

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Atkinson free?

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

### Is ca free?

ca costs $2.99, with no in-app purchases.

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

ca is rated higher. Atkinson averages 3.3 out of 5 from 6 ratings, while ca averages 4.8 from 52 ratings.

### Do Atkinson or ca have ads?

Atkinson shows ads; ca does not.

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

Atkinson ships an update monthly, and ca monthly. Most recently, Atkinson was updated on October 4, 2026 and ca on September 30, 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.*