Comparison

Stroop! vs iStroopChallenge

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

Head to head
About

Stroop!

This colorful puzzle game challenges your perception and reaction time. Match the color of the word to the word's actual color, not the word itself, under a strict time limit. Compete for high scores in this engaging brain-training experience.

Highlights
  • Color word matching
  • Time-limited challenges
  • High score competition
  • Multilingual word support
  • Reverse Stroop Effect gameplay
Features
Read full description

Stroop is confusing and colorful Puzzle Game! Don't be misled by the Reverse Stroop Effect! And Touch the color correctly in limited time. Achieve a high score!! *name of color will be written in not only English, but also French and Spanish... How to Play Color name will be shown and Touch the same color speedy! If you touch wrong color or Time is up, the Game is Over... The deadline will come closer!! Choose answer in a moment and get a high score!!

About

iStroopChallenge

Engage your brain with four distinct focus challenges, including the classic Stroop test. Improve self-control, flexibility, memory, and spatial skills through daily puzzles and various game modes. Compete with friends and track your progress with detailed statistics.

Highlights
  • Classic Stroop test
  • Four distinct focus challenges
  • Daily puzzles with streaks
  • Customizable game modes
  • Friend challenges and leaderboards
  • Color blind modes
  • Detailed progress tracking
Features
Read full description

STROOP CHALLENGE – Four brain challenges, a new puzzle every day It starts with the classic Stroop test: tap the INK COLOR of each word, not what the word says. When "RED" appears in blue ink, your brain wants to read the word, and resisting that pull is the challenge. Version 2 adds three more challenges, each testing a different kind of focus: • STROOP – Tap the ink color, not the word. • FLANKER – Swipe the way the middle arrow points while the arrows around it point the other way. • GO / NO-GO – Tap fast on GO, and hold back on STOP. • SIMON EFFECT – Red means left and blue means right, even when the color shows up on the wrong side. TWO DAILY PUZZLES • Daily Stroop – The same words for everyone, every day. • Daily Mix – Three quick rounds of different challenges, new each day. Each daily keeps its own streak, with streak freezes that save a missed day. Look back on every result in the history calendar, and share your score as a grid of colored squares. YOUR BRAIN SCORE One number from 0 to 1000, built from your speed and accuracy across every challenge, with a breakdown by skill: self-control, flexibility, memory and spatial. PLAY YOUR WAY • Timed, Bonus Time and Endless modes • Easy, Normal and Hard, plus difficulty that adapts as you play • A best score for every challenge CHALLENGE YOUR FRIENDS • Send a challenge code so a friend plays the exact same game • Game Center leaderboards and achievements MADE FOR EVERYONE • Color blind modes for red-green and blue-yellow color blindness, with colors you can tell apart and a shape on every button • VoiceOver support and large text • Respects Reduce Motion • 5 color themes Plus a home screen widget, daily reminders and detailed stats with progress charts.

Screenshots

Stroop!4 screens
iStroopChallenge4 screens

Verdict

The call

The clearest difference is review sentiment: iStroopChallenge at 100% against Stroop!'s 25%. iStroopChallenge also leads on rating (5.0 vs 3.9) and ads (none vs shown). Stroop!'s advantage is ratings volume (11 vs 1) and iOS requirement (11.0 vs 15.0). On price, 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.

ReceptionRating · Positive reviews · Number of ratings

iStroopChallenge holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Stroop! has 11 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 25% of Stroop!'s written reviews are positive against 100% of iStroopChallenge's.

UpkeepUpdate frequency

Stroop! ships an update every 2 weeks, iStroopChallenge every 6 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

Scorecard7 real differences · 3 level
Stroop! versus iStroopChallenge: the parameters behind the verdict, then further details
ParameterStroop!iStroopChallenge
PriceFreeFree
Rating3.9 (11 ratings)5.0 (1 ratings) — better
Positive reviews25.0% of reviews100.0% of reviews — better
Number of ratings11 — better1
Update frequencyEvery 2 weeksEvery 6 days — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.0
Further details — not scored
Size86 MB29 MB
Age rating4+4+
DeveloperYukihiro KadonoSteve Hunger

Customer experience

Stroop!

All ratings7 ratings
Positive57.1%
Neutral28.6%
Negative14.3%
Written reviews4 reviews
Positive25.0%
Neutral50.0%
Negative25.0%

iStroopChallenge

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Stroop!

No in-app purchases

None

iStroopChallenge

No in-app purchases

Questions

Is Stroop! free?
Stroop! is free to download, with no in-app purchases.
Is iStroopChallenge free?
iStroopChallenge is free to download, with no in-app purchases.
Which has better reviews, Stroop! or iStroopChallenge?
iStroopChallenge is rated higher. Stroop! averages 3.9 out of 5 from 11 ratings, while iStroopChallenge averages 5.0 from 1 ratings.
Do Stroop! or iStroopChallenge have ads?
Stroop! shows ads; iStroopChallenge does not.
Which is updated more often, Stroop! or iStroopChallenge?
Stroop! ships an update every 2 weeks, and iStroopChallenge every 6 days. Most recently, Stroop! was updated on November 3, 2026 and iStroopChallenge on November 5, 2026.

Other comparisons