Comparison

Atkinson vs ca

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

Head to head
About

Atkinson

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
Read full description

Transform your photos with the iconic Atkinson dithering algorithm — the same technique used on the original Macintosh by Bill Atkinson. Create stunning retro-style images with a single tap. # What is Atkinson Dithering? Atkinson dithering was the algorithm behind the classic 1-bit graphics of early Macintosh computers. It converts photos i nto beautiful two-tone pixel patterns, producing images with a distinctive vintage charm and remarkably small file sizes. # Features - Real-time Atkinson dithering preview through your camera - 7 retro-tech color palettes: Terminal Green, Amber Monitor, Original Macintosh, Game Boy, Apple II Green, White Phospho r, and classic black & white - 5 iconic frames inspired by computing history: MacPaint, Classic Mac window, Terminal, White Frame, and frameless - Adjustable brightness control - Rounded corner option - Square photo output optimized for social media - Lightweight PNG output with tiny file sizes # Color Palettes Go beyond black and white. Choose from color palettes inspired by legendary displays — the green glow of VT100 terminals, the warm amber of IBM monitors, the creamy screen of the original Macintosh, and more. # Retro Frames Wrap your dithered photos in frames inspired by classic software. The MacPaint frame features pixel-perfect tool palettes and menu bars, just like Bill Atkinson's legendary paint program. The Classic Mac frame recreates the iconic window chrome of early Macintosh. # Perfect for - Retro and vintage photo enthusiasts - Pixel art lovers - Social media posts with a unique aesthetic - Anyone who appreciates the beauty of 1-bit graphics

About

ca

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
Read full description

The successor of probably the nerdiest camera app ever made, ca-mera+ uses a cellular automaton to interpret the colors of your camera stream. The resulting images are pixelated and contain unique patterns created by cellular automata. The output can be black and white, or one of several retro color palettes (CGA 4 and 16 colors, 1-bit RGB, etc.). This app provides "selfie" and "split" modes, records video, and lets you change the appearance of the pictures by controlling the automaton application direction, its rules, the resolution, the input brightness, and the input fidelity (i.e. to which extent the cellular automaton is allowed to run freely).

Screenshots

Atkinson4 screens
ca4 screens

Verdict

The call

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.

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

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard9 real differences · 2 level
Atkinson versus ca: the parameters behind the verdict, then further details
ParameterAtkinsonca
PriceFree — better$2.99
Rating3.3 (6 ratings)4.8 (52 ratings) — better
Positive reviews71.4% of reviews88.9% of reviews — better
Number of ratings652 — better
Update frequencyMonthlyMonthly
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank—#198 — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.011.0 — better
Further details — not scored
Size19 MB2 MB
Age rating4+4+
DeveloperkoyachiFritz Menzer

Customer experience

Atkinson

All ratings6 ratings
Positive50.0%
Neutral16.7%
Negative33.3%
Written reviews7 reviews
Positive71.4%
Neutral0.0%
Negative28.6%

ca

All ratings52 ratings
Positive96.2%
Neutral1.9%
Negative1.9%
Written reviews18 reviews
Positive88.9%
Neutral11.1%
Negative0.0%

In-app purchases

2 purchases

Atkinson

Subscriptions2
  • Standard Month$0.991 Month
  • Standard Year$9.991 Year
None

ca

No in-app purchases

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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