Comparison

化学の王様 vs OSU

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

Head to head
About

化学の王様

This app offers a fun, quiz-like approach to learning high school chemistry. It features over 3000 questions in various formats and is designed to help users memorize key concepts for exams. Users can progress through stages and earn rewards while studying.

Highlights
  • Over 3000 chemistry questions
  • Quiz-like learning format
  • Short play sessions
  • Exam preparation content
  • Game-like progression
  • Gift rewards for quests
Features
Read full description

Welcome to King of Chemistry! King of Chemistry is a part of our “King” education series that focuses on quick learning in a fun quiz-like manner! Are you interested in learning chemistry? With this application, you can study chemistry in a fun and quiz-like manner! Even if you don't like this subject, this application may change your perception! This application is also useful for regular exams and college entrance exams since it adheres to high school studying guidelines. ◉ Overview ・Over 3000 chemistry-related questions in a 1 question to 1 answer format or multiple-choice format. ・Each play session is short, so you can study even if you only have a small amount of time! ・Comprehensive content that is useful for preparing for both high school and university exams. ・You can enjoy the application in a game-like manner by clearing questions and stages.   ◉ Features ・Efficiently memorize important points in chemistry for important exams! ・Since it is in an easy Q/A format, you can study easily without using a book! ・If you want to get high scores, just repeat and memorize the answers! ・As you solve more problems, you will be able see how your exams may operate and function! ・Gift rewards are available if you clear our quest mode! ◉ Subscription ・¥ 360 / month, ¥ 1,800 / 6 months, ¥ 2,900 / year ・If you choose to purchase our “SPECIAL TRAINING PLAN", payment will be charged from your iTunes account. ・In addition, your account will be charged for renewal within 24-hours prior to the end of the current period. ・Auto-renewal may be turned off at anytime by going to your settings in the iTunes Store after purchase. ・Subscription price starts at ¥240 JPY/month. ・Prices are in JAPANESE yen, which may vary in countries other than JAPAN and are subject to change without notice. ・No cancellation of the current subscription is allowed during the active subscription period. ・You may use this application for free even if you do not purchase a plan. ◉ Others ・Terms of Service: https://sites.google.com/view/hanauta/tou ・Privacy Policy: https://sites.google.com/view/hanauta/policy ・Apple Terms of Service (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

OSU

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【概要】 本アプリは 大阪成蹊大学 データサイエンス学部 の学生向けに開発しました。 Home • 学部からのお知らせや学内広告を表示 • 阪急 相川駅 次発の電車時刻をリアルタイムで確認 授業情報 • シラバス情報を一覧表示 • 全文一致検索 でキーワード検索が可能 学食 • メニュー名・価格を掲載 • 学生の 口コミ や 写真 でリアルな評価をチェック 周辺の飲食店 • 駅前キャンパス周辺の飲食店をリストアップ(随時更新) • Google Map 連携でルート案内にワンタップで遷移 時間割確認 • あらかじめ登録した科目をローカル保存し、オフラインでも時間割を確認 【免責事項】 本アプリは学生が自主的に作成したものであり、大学公式アプリではありません。 お問い合わせは大学ではなく、アプリ内「問い合わせフォーム」からお願いします。

Screenshots

化学の王様4 screens
OSU3 screens

Verdict

The call

The clearest difference is in-app purchases: OSU at none against 化学の王様's 3. OSU also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). 化学の王様's advantage is update cadence (every 3 weeks vs every 7 months). On price 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. 化学の王様 sells 3 in-app purchases, starting at $3.49 per month. OSU asks for nothing beyond the download.

UpkeepUpdate frequency

化学の王様 ships an update every 3 weeks, OSU every 7 months. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

Scorecard4 real differences · 6 level
化学の王様 versus OSU: the parameters behind the verdict, then further details
Parameter化学の王様OSU
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews42.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 3 weeks — betterEvery 7 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.013.0 — better
Further details — not scored
Size139 MB31 MB
Age rating4+4+
DeveloperHANAUTA INC.eita nakagaichi

In-app purchases

3 purchases

化学の王様

Subscriptions3
  • 合格プラン$3.491 Month
  • 合格プラン3 Days trial$17.496 Months
  • 合格プラン3 Days trial$27.991 Year
None

OSU

No in-app purchases

Questions

Is 化学の王様 free?
化学の王様 is free to download, with in-app purchases available.
Is OSU free?
OSU is free to download, with no in-app purchases.
Do 化学の王様 or OSU have ads?
化学の王様 shows ads; OSU does not.
Which is updated more often, 化学の王様 or OSU?
化学の王様 ships an update every 3 weeks, and OSU every 7 months. Most recently, 化学の王様 was updated on November 7, 2026 and OSU on November 8, 2026.

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