π Challenge vs PiMemory
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
π Challenge
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"Pi Challenge" is a fun and engaging brain-training game designed to help you memorize Pi while improving your memory and concentration skills. Easy-to-use controls make this game accessible to everyone—just input the next digit of Pi correctly to extend your streak. Be careful—one wrong digit and it's game over! Compete against yourself and your friends, share your best scores on social media, and enjoy a quick brain exercise anytime, anywhere. Exciting updates are on the way, including a Time Attack mode, online leaderboards, and educational features to master memorizing Pi. Join the challenge today and become a Pi master!
PiMemory
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PiMemory is a fun app to learn and memorize the digits of π. In Game Mode, you can enter numbers to challenge yourself and set high scores up to 3,000 decimal places. In Learn Mode, you can view and practice π up to 3,000 decimal places repeatedly. Key Features: - Game Mode: Challenge yourself by matching π digits using the numeric keypad (up to 3,000 decimal places) - Learn Mode: Check and practice π digits as far as you want (up to 3,000 decimal places) - High Score Management: Save and update your personal records - Intuitive UI: Optimized design for both iPhone and iPad - Ads: Banner ads for free use (privacy-compliant) Have fun memorizing π with PiMemory while improving your focus and memory skills!
Screenshots
Verdict
The clearest difference is ads: π Challenge at none against PiMemory's shown. π Challenge also leads on iOS requirement (13.0 vs 16.6). PiMemory's advantage is update cadence (fortnightly vs every 9 months). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
π Challenge ships an update every 9 months, PiMemory fortnightly. The most recent releases landed on September 24, 2026 and March 19, 2026 respectively.
| Parameter | π Challenge | PiMemory |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 months | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 29 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Warashibe Tech LLC | Younghan Kim |
In-app purchases
π Challenge
No in-app purchases
PiMemory
No in-app purchases





