Brain Training Calculation Master vs P21
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Brain Training Calculation Master
Enhance your mathematical skills with engaging practice sessions. This app offers customizable drills for addition, subtraction, and multiplication, with options for digit count and question quantity. It also features unique numeral systems to further challenge your brain.
- Addition, subtraction, and multiplication practice
- Selectable digit count (1-4 digits)
- Customizable question quantity (10, 30, 50, 100)
- Adjustable button arrangement
- Multiple numeral systems (standard, Chinese, Japanese, English)
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Let's improve Math ability in your free time! Play and Repeat this practice, your calculation speed will be so much faster. And, get quick wit with training your brain. +Features - Practice addition, subtraction, and multiplication. - The number of digits can be chosen from 1 to 4 digits. - You can set up the number questions from 10, 30, 50, or 100 questions. - The number buttons arrangement is either "top to bottom", or "bottom to top". - Calculation Character mode has standard Numerals system and PLUS, there are Chinese numeral system, Japanese numeral system and English numeral system. Chinese, Japanese and English version will use your brain more and possible to train quick wit.
P21
This educational app supports a four-level phonics series for young learners. It offers audio tracks, videos, flashcards, and games to help children build foundational skills in phonological awareness, reading, and spelling.
- Audio tracks from student books
- Educational videos
- Keyword flashcards
- Phonics games
- Progress tracking
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P21 is a four-level phonics series for young learners. With the P21 App, you can listen to audio tracks from the P21 student books, watch videos in each unit, review keywords with flashcards, and play interesting phonics games. It contains all of the resources you need when learning phonics using the P21 series. Through the P21 series, children are able to build solid foundations in phonological awareness, oral language, phonics, reading, and spelling. The Alphabet, Short Vowels and Special Letters, Long Vowels and Blends, and Controlled Vowels and Digraphs are covered in the series. With P21 and the P21 App, your 21st century kids will become experts in the sounds of English.
Screenshots
Verdict
The clearest difference is ads: P21 at none against Brain Training Calculation Master's shown. P21 also leads on monetization model (free vs ad-supported) and update cadence (every 6 weeks vs every 3 months). Brain Training Calculation Master's advantage is iOS requirement (7.0 vs 11.0). On price, rating, ratings volume and in-app purchases 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.
On the App Store both sit at effectively the same score — 5.0 for Brain Training Calculation Master against 5.0 for P21. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Brain Training Calculation Master ships an update every 3 months, P21 every 6 weeks. The most recent releases landed on August 20, 2026 and July 6, 2026 respectively.
| Parameter | Brain Training Calculation Master | P21 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 3 months | Every 6 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 7.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 16 MB | 226 MB |
| Age rating | 4+ | 4+ |
| Developer | Takahiro Iwatani | CAVES BOOKS LTD. |
Customer experience
Brain Training Calculation Master
P21
In-app purchases
Brain Training Calculation Master
No in-app purchases
P21
No in-app purchases






