A3S vs FlashAnzan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
A3S
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Design Changes
FlashAnzan
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Practice flash anzan (flash mental arithmetic) in the same format as the Japanese grading exam—and climb the ranks. GRADED MODE (30 RANKS, KYU 10 TO DAN 20) Each rank uses the exam's total-time format: numbers flash within a fixed total time, you answer 10 problems, and 70 points is a pass. YOUR GRADE IS KEPT Your best rank is recorded on the device and in iCloud, so it follows you to a new device. ANSWER BY VOICE Type on the number pad, or just say the answer. Speech recognition runs entirely on your device—your voice is never sent anywhere. CUSTOM PRACTICE Set digits, count, and display time yourself—from slow single digits to 3-digit numbers at 0.3 seconds. IPHONE DUO Big numbers when it's open; fold it in half and the question sits above with the number keys below. Close it and keep practicing on the outer screen. IPHONE, IPAD AND MAC Works on iPhone, iPad and Mac, and your grade follows you between them through iCloud. No ads. Available in nine languages: English, Japanese, Chinese (Simplified and Traditional), Korean, German, Spanish, French and Brazilian Portuguese. Note: This app is not affiliated with or endorsed by any certification body.
Screenshots
Verdict
The clearest difference is in-app purchases: A3S at none against FlashAnzan's 1. A3S also leads on iOS requirement (13.0 vs 18.0). FlashAnzan's advantage is update cadence (every 3 days vs every 2 weeks). 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. FlashAnzan sells 1 one-off in-app purchase. A3S asks for nothing beyond the download.
A3S ships an update every 2 weeks, FlashAnzan every 3 days. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.
| Parameter | A3S | FlashAnzan |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac, Apple Watch — better |
| Requires iOS | 13.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 30 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Deccan Spark Technologies | Haruhiko Kishi |
In-app purchases
A3S
No in-app purchases
FlashAnzan
- Unlock All Grades$3.99
