iStroopChallenge vs Math Duel
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- Classic Stroop test
- Four distinct focus challenges
- Daily puzzles with streaks
- Customizable game modes
- Friend challenges and leaderboards
- Color blind modes
- Detailed progress tracking
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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.
Math Duel
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Challenge a friend to a fast-paced math showdown on the same device. Math Duel - Brain Battle is a split-screen competitive math game where two players face off from opposite ends of one phone. An equation appears in the center. Race to tap the correct answer first and win the round. Wrong answer? Your opponent gets the point. Optional timers add pressure, streak bonuses reward consistency, and unlockable themes let you customize the arena. Features: • Same-device multiplayer • Easy, Medium, Hard, and Mixed difficulty options, plus Custom ranges with Pro • 10, 15, or 20 round matches • Optional round timer • Streak bonuses • Full game stats tracking • Multiple color themes • Offline play with no internet or account required Perfect for classrooms, car rides, lunch tables, and anywhere two brains want to battle.
Screenshots
Verdict
The clearest difference is in-app purchases: iStroopChallenge at none against Math Duel's 4. On price, update cadence, ads 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
Both are free to download. Math Duel sells 4 one-off in-app purchases. iStroopChallenge asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 6 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.
| Parameter | iStroopChallenge | Math Duel |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 6 days | Every 6 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 29 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Steve Hunger | Seif Ibrahim |
In-app purchases
iStroopChallenge
No in-app purchases
Math Duel
- Neon Theme Pack$0.99
- Nature Theme Pack$0.99
- Retro Theme Pack$0.99
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- Math Duel Pro$2.99
Questions
Is iStroopChallenge free?
Is Math Duel free?
Do iStroopChallenge or Math Duel have ads?
Which is updated more often, iStroopChallenge or Math Duel?
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