Comparison

Number Decomposition vs とけいよめるかな?

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

Head to head
About

Number Decomposition

This educational app teaches children foundational math skills by focusing on number bonds up to 10, avoiding counting to build a strong understanding of arithmetic. It uses visual aids and a structured approach for quick, accurate recall of addition and subtraction facts.

Highlights
  • Number bonds up to 10
  • Drag and drop interface
  • Visual quantity images
  • Spaced repetition learning
  • Child-friendly avatars
  • Offline functionality
Features
Read full description

LEARN MATH – WITHOUT COUNTING Many children learn arithmetic by counting. That is tedious and often the start of later difficulties with math. This app begins exactly where true understanding develops after quantity–number correspondence: with the automation of number bonds up to 10. Children learn how numbers are structured and can solve addition and subtraction tasks safely, quickly, and from memory. No counting, no frustration, with visible success. HOW IT WORKS • Example: 8 = ? and 3 • One part is given, the other is added via drag & drop • Correct? → reward and progress • Wrong? → gentle feedback and repeat • Only fast, correct answers (under 5 seconds) count as “known by heart” MADE FOR CHILDREN – EVEN WITHOUT READING • Intuitive operation with number tiles and structured quantity images (dice, fingers, dots, and more) • Four child-friendly animal avatars: panda, dolphin, cat, dog • Each correct task colors the avatar more • Learning progress is always visible and motivating FOCUSED LEARNING INSTEAD OF A GAME APP • Reduced sounds and calm, clear visuals • No distracting effects, no flashy colors • Clear didactic structure: not a game, but a real teaching and learning app PEDAGOGICALLY SOUND – RESEARCH-BASED • Leitner learning system with spaced repetition (boxes 1–4) • Didactic reduction: only meaningful decompositions, no swapped pairs, no zero • Structured quantity images strengthen number sense and understanding • Error-oriented learning: incorrect tasks are deliberately repeated • Progress per avatar is transparent – also for parents and teachers SAFE AND AD-FREE • No ads • No in-app purchases • Works offline – ideal for on the go • One-time purchase, permanent use DOWNLOAD NOW – MAKE MATH SIMPLE With this app, your child becomes a master of number bonds: playful, visually structured, and sustainable. Ideal for preschool, first grade, or home practice – without distractions and with full focus on what matters.

About

とけいよめるかな?

Features
Read full description

「とけいよめるかな?」は、小学1〜2年生のお子さま向けに、アナログ時計の読み方を楽しく練習できる学習アプリです。 ■ こんなアプリです ・1チャレンジ10問の4択クイズ。1日5分から気軽に続けられます ・レベル1「ちょうどのじかん」からレベル4「5ふんきざみ」まで、4段階で少しずつステップアップ ・正解すると大きな花丸とごほうびの音。まちがえても「おしい!」とやさしくフォロー ・ホームはオルゴール風のBGM、問題中はチックタックの時計音。スピーカーボタンで音は一括オン/オフできます ■ 保護者の方へ ― 安心してお使いいただけます ・ログイン不要。氏名・年齢などの個人情報は一切入力しません ・外部との通信を行わないため、機内モード(オフライン)でも動作します ・広告は一切表示しません。アプリ内課金もありません ・保存されるのは端末内の設定・進捗のみで、外部に送信されることはありません 親子で「いま何時かな?」と話しながら、生活の中の時計に自然と親しめます。

Screenshots

Number Decomposition4 screens
とけいよめるかな?4 screens

Verdict

The call

The clearest difference is price: とけいよめるかな? at Free against Number Decomposition's $3.99. とけいよめるかな? also leads on iOS requirement (15.1 vs 17.0). On ads, in-app purchases 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

とけいよめるかな? is free to download; Number Decomposition costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scorecard2 real differences · 6 level
Number Decomposition versus とけいよめるかな?: the parameters behind the verdict, then further details
ParameterNumber Decompositionとけいよめるかな?
Price$3.99Free — better
Positive reviews100.0% of reviews—
Update frequencyEvery 5 months—
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.015.1 — better
Further details — not scored
Size78 MB25 MB
Age rating4+4+
DeveloperLernwunderTakeshi Kusaka

In-app purchases

None

Number Decomposition

No in-app purchases

None

とけいよめるかな?

No in-app purchases

Questions

Is Number Decomposition free?
Number Decomposition costs $3.99, with no in-app purchases.
Is とけいよめるかな? free?
とけいよめるかな? is free to download, with no in-app purchases.
Do Number Decomposition or とけいよめるかな? have ads?
Neither Number Decomposition nor とけいよめるかな? shows ads.

Other comparisons