# Atkinson vs Trichromy

The clearest difference is rating: Trichromy at 5.0 against Atkinson's 3.3. Trichromy also leads on ads (none vs shown) and review sentiment (80% vs 71%). On price, ratings volume, update cadence and in-app purchases there is nothing between them.

Both are free to download. Atkinson sells 2 in-app purchases, starting at $0.99 per month and Trichromy sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Trichromy holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 6 and 8 respectively. Written reviews point the same way: 71% of Atkinson's written reviews are positive against 80% of Trichromy's.

Atkinson ships an update monthly, Trichromy every 3 weeks. The most recent releases landed on June 5, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Atkinson | Trichromy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (6 ratings)](https://appshunter.io/ios/app/atkinson/id1569487124/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/trichromy/id6448881187/reviews)** |
| Number of ratings | 6 | **8** |
| Positive reviews | 71.4% of reviews | **80.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 19 MB | 2 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tsutomu Koyachi](https://appshunter.io/developer/413497532) | [Héliographe, Inc](https://appshunter.io/developer/1784071997) |

## 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 |


### Trichromy

[App page](https://appshunter.io/ios/app/trichromy/id6448881187)

Explore trichromatic photography with this unique camera app. Capture stunning color images by layering three monochromatic exposures, offering a distinctive visual style. Experiment with different timings and capture orders for psychedelic or subtle effects.

**Highlights:** Trichromatic photography capture, Layering of 3 monochromatic images, Adjustable delay between exposures, Individual colored shutter controls, Straightforward user interface, Historical photographic process exploration

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $4.99 | one-time |
| Full Unlock | $4.99 | one-time |
| Medium Tip | $9.99 | one-time |
| Large Tip | $19.99 | one-time |


## Frequently asked questions

### Is Atkinson free?

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

### Is Trichromy free?

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

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

Trichromy is rated higher. Atkinson averages 3.3 out of 5 from 6 ratings, while Trichromy averages 5.0 from 8 ratings.

### Do Atkinson or Trichromy have ads?

Atkinson shows ads; Trichromy does not.

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

Atkinson ships an update monthly, and Trichromy every 3 weeks. Most recently, Atkinson was updated on June 5, 2026 and Trichromy on September 18, 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.*