# Pi Recall 100 — Digits Memory Speed Challenge

> Digits Memory Speed Challenge (iPhone/iPad app by MITSURU ADACHI.)

- Source: https://appshunter.io/ios/app/pi-recall-100/id6796900142 (this page in markdown: same URL + `.md`)
- Developer: [MITSURU ADACHI](https://appshunter.io/developer/6794788162)
- Category: Education, Games, Trivia
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 52 MB
- Languages: American English, Japanese
- Released: 2026-08-25
- Data updated: 2026-09-17
- User reviews in markdown: https://appshunter.io/ios/app/pi-recall-100/id6796900142/reviews.md

## What is Pi Recall 100?

Pi Recall 100 makes memorizing 100 decimal digits of pi a focused, fast-paced challenge.

Start with the 10-digit course. Clear each course to move on to the next group of digits, then use the on-screen number pad to race toward all 100 digits.

FEATURES
• Courses from 10 to 100 digits in 10-digit steps
• A focused 3–2–1 countdown
• Times measured to one hundredth of a second
• Mistake counting
• Top three records stored on your device for each course
• A readable 100-digit reference grouped by 10 digits
• Sound and haptic controls
• Japanese and English, Dark Mode, and VoiceOver support

The 10- and 20-digit courses are free. A one-time Premium purchase provides access to the 30–100 digit courses. You must also clear each preceding course before moving on.

Records are stored locally on your device. No account, ads, online leaderboard, or cloud sync is required.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 100-Digit Challenge Premium | $2.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-08-25

No release notes.

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## More apps by MITSURU ADACHI

- [OneThing: Daily Focus](https://appshunter.io/ios/app/onething-daily-focus/id6794788160)
- [Multiplication Rush](https://appshunter.io/ios/app/multiplication-rush/id6797836678)
- [FORMULA: Tennis Playbook](https://appshunter.io/ios/app/formula-tennis-playbook/id6799834328)
- [Bench Press 100kg: Workout Log](https://appshunter.io/ios/app/bench-press-100kg-workout-log/id6808933145)

All apps by MITSURU ADACHI: https://appshunter.io/developer/6794788162

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-17.*