Abacus Lesson vs Kizki
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Abacus Lesson
Learn the simple and fast method of division using an abacus. This app focuses on developing mental calculation skills by leveraging the abacus technique. It's recommended to master addition, subtraction, and multiplication with an abacus first.
- Learn abacus division techniques
- Develop mental calculation skills
- Focus on Soroban method
- Step-by-step division instruction
- Builds on addition, subtraction, multiplication
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An abacus is named "Soroban" in Japan. Do you know what an abacus is? The abacus is very simple calculator used in China, Japan, Korea and so on. Some people may say "Isn't it an unnecessary tool if you have a calculator such as a smartphone?". Answer would be "No". The biggest difference between electric calculators and the abacus is whether you need to hold it in your hand when calculating. Because of its simplicity, you will be able to easily use the abacus in your mind. In the app, we will explain simple and fast method of the division using the abacus. To learn division, it is essential to be able to add, sub, and multiplication with an abacus. If you are new to them, we recommend that you learn addition subtraction multiplication with the app in my app list first. This app will give you the skill of calculation of division.
Kizki
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子どもの成長は、ほんのささいな瞬間の積み重ね。 その “かけがえのない瞬間” を見逃さずに残すための、成長記録アプリが Kizki です。 Kizki は、 ・入力画面でその日の気づきをすぐに記録 ・カレンダーでいつどんな記録があったかひと目で確認 ・子ども・生徒ごとに時系列の成長ログを整理して閲覧 ・データのエクスポート・インポートにも対応 忙しい毎日の中でも、 小さな変化に気づき、未来へ残すための “まなざしの道具” としてお使いいただけます。 【主な機能】 ■入力(Input) ・日付を選んで、すぐに記録を追加 ・名前を登録し、子どもごとに管理 ・必要最低限のシンプル操作でストレスなく入力 ■ カレンダー表示 ・ひと月の記録を一覧で確認 ・記録がある日にマークが表示 ・日付をタップして詳細を閲覧 ■ 記録一覧 ・記録を表形式で整理 ・長文のメモも読みやすく表示 ・期間を設定し、コピー出力可能 ■ 子どもリスト ・子ども/生徒ごとに記録を集約 ・個別の成長の流れを確認できる ■ データ管理(設定) ・エクスポートでバックアップ ・インポートでデータ復元 ・iCloud Drive 等へ保存可能 【こんな方におすすめ】 子どもの成長をしっかり残しておきたい保護者 日々の変化を記録しておきたい先生 育児日記や保育記録が続かなかった人 シンプルで使いやすい記録アプリを探している方
Screenshots
Verdict
The clearest difference is in-app purchases: Kizki at none against Abacus Lesson's 3. Kizki also leads on ads (none vs shown). Abacus Lesson's advantage is iOS requirement (11.0 vs 15.1). On price, update cadence 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. Abacus Lesson sells 3 one-off in-app purchases. Kizki asks for nothing beyond the download.
Abacus Lesson ships an update monthly, Kizki every 3 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.
| Parameter | Abacus Lesson | Kizki |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (8 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Monthly | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 132 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Hirokazu Komatsu | Kanji Goto |
In-app purchases
Abacus Lesson
- Donation Lv1 for hiding Ad$1.99
- Donation Lv2 for hiding Ad$3.99
- Donation Lv3 for hiding Ad$8.99
Kizki
No in-app purchases









