Comparison

RemNum 〜 数字を暗記するだけのアプリ vs Mahjong Skill Builder

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

Head to head
About

RemNum 〜 数字を暗記するだけのアプリ

Features
Read full description

This is an app that only memorizes numbers. This app displays numbers one character at a time in order, so all you have to do is memorize and enter them. Use it for memory training.

About

Mahjong Skill Builder

Master Mahjong scoring with structured practice. Learn to identify yaku, calculate han and fu, and determine final scores through five progressive training modes. Track your progress and improve your game with realistic hands and quick, randomized sessions.

Highlights
  • Master Mahjong scoring
  • Learn yaku and han values
  • Calculate fu and final points
  • Five progressive training modes
  • Realistic hand scenarios
  • Progress tracking and feedback
  • Quick, randomized sessions
Features
Read full description

Mahjong Quiz A serious training app for mastering Japanese (Riichi) Mahjong yaku, scoring, and reading waits. Struggling with scoring? Can't spot your waits at a glance? You're not alone. This app breaks yaku, han counting, han & fu reading, scoring, and wait recognition into 6 levels you can practice again and again with fun quizzes. It also includes a Hand Scanner: just take a photo of your hand to get its yaku, han, fu, and points. ■ Level up step by step with 6 quiz modes [Lv.0 How many han?] See a yaku name and answer how many han it is worth. An introductory mode for memorizing yaku values. [Lv.1 Which yaku?] Look at a winning hand and identify its yaku. Covers basic and combined yaku, including hands with calls (chi, pon). Switch between "Combined" (select all yaku at once) and "Individual" (select one at a time) answer styles. [Lv.2 Han & Fu?] Read the han and fu of a winning hand. You'll naturally learn how han add up and how fu are counted (melds, wait shapes, and how the hand was won). Hands of mangan or higher can be set to "Han only". [Lv.3 Points? - Score Table] Given han and fu, answer the payment for dealer/non-dealer and ron/tsumo. Train your score table memory, including rounding up to the nearest 100 and mangan through yakuman. [Lv.4 Points? - Winning Hand] An all-round mode: look at a winning hand, judge its yaku, han & fu, and answer the final points. A "Show yaku" hint is available. [Lv.5 What's the wait?] Look at a tenpai hand and find its winning tiles. From basic ryanmen, kanchan, and shanpon waits to irregular three-sided waits and the nine-sided Chuuren Poutou wait. All winning tiles are shown after you answer. ■ Realistic, game-like questions Includes 100 winning hands and 100 tenpai hands. Conditions such as dealer/non-dealer, ron/tsumo, seat and round wind, dora, ura-dora, red fives, riichi, ippatsu, and calls (chi, pon, kan) are shown at a glance. Covers everything from tanyao, pinfu, and yakuhai to sanshoku, ittsu, chanta, and yakuman such as kokushi musou and daisangen. ■ Hand Scanner Take a photo of your hand or pick one from your library, and AI recognizes the tiles and calculates yaku, han, fu, and points automatically. - Choose between high-accuracy "Cloud AI" and fast, offline-capable "Our AI" - Tap any tile to correct it; the result recalculates automatically - Set dealer/non-dealer, ron/tsumo, round and seat wind, riichi, ippatsu, dora count, and calls Perfect for checking scores after a real game. ■ Customize how you learn - Number of choices (4, 6, 8, or 10) - Auto-advance after a correct answer (manual or 1-3 seconds) - Question order (random, ascending, descending) - Daily practice reminder at a time you choose - Languages: Japanese, English, Chinese, Korean, Vietnamese ■ Track your progress The activity calendar shows the days you practiced, and per-mode accuracy shows your strengths and weaknesses. The result screen gives feedback based on your score, and you can share your results on social media. ■ Premium - Remove all ads - Choose the number of questions (10, 50, 100, or endless) - "Weak first" mode that prioritizes questions you got wrong - Unlimited Hand Scanner (free version: up to 10 scans per day) Premium is offered as monthly and annual auto-renewing subscriptions. - Payment will be charged to your Apple ID account at confirmation of purchase. - The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. - You can manage or turn off auto-renewal in your App Store account settings after purchase. ■ Download now and become a scoring master With repeated practice, you'll be able to calculate scores quickly in your head at the table. Make the most of your spare moments to improve your Mahjong. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://aquapeakstudio.com/privacy-policy

Screenshots

RemNum 〜 数字を暗記するだけのアプリ1 screens
Mahjong Skill Builder4 screens

Verdict

The call

The clearest difference is in-app purchases: RemNum 〜 数字を暗記するだけのアプリ at none against Mahjong Skill Builder's 2. RemNum 〜 数字を暗記するだけのアプリ also leads on iOS requirement (12.0 vs 15.1). Mahjong Skill Builder's advantage is update cadence (every 4 days vs every 3 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Mahjong Skill Builder sells 2 in-app purchases, starting at $0.99 per month. RemNum 〜 数字を暗記するだけのアプリ asks for nothing beyond the download.

UpkeepUpdate frequency

RemNum 〜 数字を暗記するだけのアプリ ships an update every 3 weeks, Mahjong Skill Builder every 4 days. The most recent releases landed on October 4, 2026 and October 15, 2026 respectively.

Scorecard3 real differences · 5 level
RemNum 〜 数字を暗記するだけのアプリ versus Mahjong Skill Builder: the parameters behind the verdict, then further details
ParameterRemNum 〜 数字を暗記するだけのアプリMahjong Skill Builder
PriceFreeFree
Positive reviews—33.3% of reviews
Update frequencyEvery 3 weeksEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.1
Further details — not scored
Size48 MB42 MB
Age rating4+4+
Developeryoshitomo ishiiKeita Ide

In-app purchases

None

RemNum 〜 数字を暗記するだけのアプリ

No in-app purchases

2 purchases

Mahjong Skill Builder

Subscriptions2
  • Skill Builder Premium Monthly$0.991 Month
  • Skill Builder Premium Yearly3 Months trial$9.991 Year

Questions

Is RemNum 〜 数字を暗記するだけのアプリ free?
RemNum 〜 数字を暗記するだけのアプリ is free to download, with no in-app purchases.
Is Mahjong Skill Builder free?
Mahjong Skill Builder is free to download, with in-app purchases available.
Do RemNum 〜 数字を暗記するだけのアプリ or Mahjong Skill Builder have ads?
Neither RemNum 〜 数字を暗記するだけのアプリ nor Mahjong Skill Builder shows ads.
Which is updated more often, RemNum 〜 数字を暗記するだけのアプリ or Mahjong Skill Builder?
RemNum 〜 数字を暗記するだけのアプリ ships an update every 3 weeks, and Mahjong Skill Builder every 4 days. Most recently, RemNum 〜 数字を暗記するだけのアプリ was updated on October 4, 2026 and Mahjong Skill Builder on October 15, 2026.

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