Comparison

Size test vs C2 Stroop Task

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

Head to head
About

Size test

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This app is designed to assess how quickly the user reacts to changes in the size of an object. Users can select one of the test modes: 'Increasing the object', 'Decreasing the object', 'Decreasing or increasing the object'. When the user observes a change in the size of an object, the user must break contact with the device screen. The recorded test time reflects the user's ability to perceive the change in object size. Once the test is completed, the results are tested for normality of distribution (Shapiro-Wilk test). If the values deviate from the law of normal distribution, the program analyzes the data sets, removes the worst value and adds an additional attempt. In the program settings you can select the number of attempts - from 10 to 30. The choice of the number of attempts depends on the performer's age and professional activity. In addition, in the program settings the user can save a backup copy of his measurements in JSON format anywhere (Save backup), add measurements from another device (Add backup), replace already saved measurements with new ones (Replace backup) or delete all data (Delete all data). This application is intended to be used by athletes and teachers in specialized educational institutions for scientific research.

About

C2 Stroop Task

Features
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The iOS app "C2 Stroop Task" is intended for those who are interested in cognitive psychology, those who are learning cognitive psychology, and those who are researching it. * The effect of the Stroop task appears as a difference in time to perceive text color in the following two cases, for example. ・text color = red, text = "red" (compatible) ・text color = red, text = "green" (incompatible) This app allows you to see the Stroop effect numerically. The iOS app "C2 Stroop Task" records the response time of a stroop task (task conflict) in milliseconds. Response time is the time from when the task is displayed to when the answer button is touched (touchdown). The recorded data can be output to a CSV file and read into a spreadsheet application such as Excel. Language settings can be made by editing the words for each color, so any language that can be entered from the keyboard can be set. You can set the intertrial interval, number of tasks, compatibility rate, color selection, position, size, background color, whether to shuffle the answer buttons, etc. [details] https://app.brain-workout.org/strooptask-e/

Screenshots

C2 Stroop Task4 screens

Verdict

The call

The clearest difference is price: Size test at $0.99 against C2 Stroop Task's $3.99. C2 Stroop Task's advantage is device support (3 vs 1). On update cadence, ads, in-app purchases and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Size test costs $0.99 and C2 Stroop Task $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 10 months. The most recent releases landed on May 19, 2026 and September 24, 2026 respectively.

Scorecard2 real differences Β· 4 level
Size test versus C2 Stroop Task: the parameters behind the verdict, then further details
ParameterSize testC2 Stroop Task
Price$0.99 β€” better$3.99
Update frequencyEvery 10 monthsEvery 10 months
AdsNoNo
In-app purchasesNoNo
DevicesiPadiPhone, iPad, iPod β€” better
Requires iOS14.0 β€” better15.6
Further details β€” not scored
Size1 MB1 MB
Age rating4+4+
DeveloperViacheslav RomanenkoYasuyoshi Ota

In-app purchases

None

Size test

No in-app purchases

None

C2 Stroop Task

No in-app purchases

Questions

Is Size test free?
Size test costs $0.99, with no in-app purchases.
Is C2 Stroop Task free?
C2 Stroop Task costs $3.99, with no in-app purchases.
Do Size test or C2 Stroop Task have ads?
Neither Size test nor C2 Stroop Task shows ads.
Which is updated more often, Size test or C2 Stroop Task?
Size test ships an update every 10 months, and C2 Stroop Task every 10 months. Most recently, Size test was updated on May 19, 2026 and C2 Stroop Task on September 24, 2026.

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