Comparison

js vs ColoriDisc

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

Head to head
About

js

Features
Read full description

Explanation: STAR is a nickname for statistical analysis program developed for personal computers.(STatistical Analysis Rescuers). Main functions · Fisher's exact test 1 x 2 · Fisher's exact test 1 x 2 (P1 not equal P2) · Fisher's exact test 2 x 2 · Chi-square Test 1 x J · Chi-square Test i x J · Add Grade1 x 2 ■Method of use (1) Start the "js-STAR" app. (2) Tap the [ frequency test ] button (3) Enter a number where two or four square cells are displayed. (4) Tap the [ Calculate!" ] Button. (5) Result is output to the TextField. ■Disclaimer (1) This may not run correctly depending on the iOS version or model. (2) The creator shall not bear any responsibility for any damage caused to the user when downloading the app.

About

ColoriDisc

Features
Read full description

Colori turns color perception into a beautiful game. Each round presents a mosaic of colored patches. Most share the same hue — but a handful are quietly, subtly different. Your task: find and tap every patch that doesn't belong. Easy to learn, surprisingly hard to master. HOW IT WORKS - A reference color fills the screen as a field of tessellated patches. - Hidden among them are target patches shifted in hue, lightness, or saturation. - Tap every target before time runs out. - The easier differences vanish quickly — the tricky ones linger, daring you to find them. - Miss too many and you lose a life. Run out of lives and the game ends. GETTING HARDER AS YOU GO Color differences start large and obvious, then shrink with each level. Your eyes must work harder and harder to pick out what your brain insists looks the same. GLOBAL LEADERBOARD How does your color vision compare? After each game your score is submitted to a worldwide ranking. Set a nickname, track your personal best, and see where you stand among players around the globe. THE SCIENCE BEHIND THE FUN Colori was developed by vision scientists at Justus-Liebig-Universität Giessen. Every game you play contributes — anonymously — to research on human color discrimination. You're not just playing; you're helping us understand how human color vision works. Play casually for a few minutes, or push for a top-10 score. Either way, you'll never look at colors quite the same way again.

Screenshots

js4 screens
ColoriDisc4 screens

Verdict

The call

The clearest difference is update cadence: ColoriDisc at daily against js's every 2 months. js's advantage is iOS requirement (13.0 vs 17.6). On price, ads, in-app purchases 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

js ships an update every 2 months, ColoriDisc daily. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 4 level
js versus ColoriDisc: the parameters behind the verdict, then further details
ParameterjsColoriDisc
PriceFreeFree
Update frequencyEvery 2 monthsDaily — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.6
Further details — not scored
Size1 MB21 MB
Age rating9+4+
DeveloperHiroyuki NakanoKarl Gegenfurtner

In-app purchases

None

js

No in-app purchases

None

ColoriDisc

No in-app purchases

Questions

Is js free?
js is free to download, with no in-app purchases.
Is ColoriDisc free?
ColoriDisc is free to download, with no in-app purchases.
Do js or ColoriDisc have ads?
Neither js nor ColoriDisc shows ads.
Which is updated more often, js or ColoriDisc?
js ships an update every 2 months, and ColoriDisc daily. Most recently, js was updated on October 26, 2026 and ColoriDisc on October 28, 2026.

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