Comparison

Brain Training Calculation Master vs P21

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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)
Features
Read full description

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.

About

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.

Highlights
  • Audio tracks from student books
  • Educational videos
  • Keyword flashcards
  • Phonics games
  • Progress tracking
Features
Read full description

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

Brain Training Calculation Master4 screens
P214 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Brain Training Calculation Master versus P21: the parameters behind the verdict, then further details
ParameterBrain Training Calculation MasterP21
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings11
Update frequencyEvery 3 monthsEvery 6 weeks — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS7.0 — better11.0
Further details — not scored
Size16 MB226 MB
Age rating4+4+
DeveloperTakahiro IwataniCAVES BOOKS LTD.

Customer experience

Brain Training Calculation Master

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

P21

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Brain Training Calculation Master

No in-app purchases

None

P21

No in-app purchases

Questions

Is Brain Training Calculation Master free?
Brain Training Calculation Master is free to download, with no in-app purchases.
Is P21 free?
P21 is free to download, with no in-app purchases.
Which has better reviews, Brain Training Calculation Master or P21?
Brain Training Calculation Master and P21 are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Brain Training Calculation Master or P21 have ads?
Brain Training Calculation Master shows ads; P21 does not.
Which is updated more often, Brain Training Calculation Master or P21?
Brain Training Calculation Master ships an update every 3 months, and P21 every 6 weeks. Most recently, Brain Training Calculation Master was updated on August 20, 2026 and P21 on July 6, 2026.

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