π ~PI~ vs Constant Challenge
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
π ~PI~
Learn the digits of pi with engaging practice and challenge modes. Test your memory and see how many digits you can recall. Perfect for math enthusiasts and those looking to improve their memorization skills.
- Learn pi digits
- Practice mode
- Challenge mode
- Memorize long sequences
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This app supports to learn pi (ratio of a circle's circumference). You can choose PRACTICE MODE and CHALLENGE MODE. Learn longer, longer, longer digits.
Constant Challenge
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Constant Challenge is a training app designed to help you memorize mathematical constants like π (pi) and e while testing your skills through various challenge modes. Each constant offers the same set of game modes, allowing you to practice, compete, and improve your memory and speed. Features: - Practice Mode: Learn and memorize digits at your own pace - Time Attack Mode: Enter as many correct digits as possible within a time limit - Stage Mode: Progress through structured levels of increasing difficulty - Local Battle Mode: Competitive play possible Track your performance, challenge yourself, and aim for high scores. Perfect for students, math enthusiasts, and anyone who enjoys memory challenges. Note: This app focuses on memorization and training of mathematical constants.
Screenshots
Verdict
The clearest difference is in-app purchases: π ~PI~ at none against Constant Challenge's 3. π ~PI~ also leads on iOS requirement (8.0 vs 26.0). Constant Challenge's advantage is update cadence (every 2 days vs every 6 months). On price, 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. Constant Challenge sells 3 one-off in-app purchases. π ~PI~ asks for nothing beyond the download.
π ~PI~ ships an update every 6 months, Constant Challenge every 2 days. The most recent releases landed on September 27, 2026 and September 28, 2026 respectively.
| Parameter | π ~PI~ | Constant Challenge |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 6 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 8.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 23 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Yuki Takeda | Kaname Inoue |
In-app purchases
π ~PI~
No in-app purchases
Constant Challenge
- Unlock the Square Root of 2 (√2)$0.99
- Unlock the Golden Ratio (φ)$0.99
- Unlock the Euler–Mascheroni (γ)$0.99
