漸化式ガチャ vs Structura
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
漸化式ガチャ
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漸化式ガチャとは,おいしい数学サイト内で2020年7月21日にリリースした,数学ⅡBまでの漸化式の問題をランダムで3題出題するサービスで,web版の機能を受け継ぎ,さらに強化されたアプリ版になります(iPhone,iPad両対応). 当アプリ版には,web版に加え以下の特徴があります. 1.web版よりも問題数増加,ガチャの組み合わせは現在50460通り(web版は18620通り) 2.ガチャ回し放題,時間制限無し 3.上級のみスイッチ((3)で必ず上級が出るようにできます) 4.追加情報記載(出典や問題の背景となる関連情報が記載されています) 5.タイマー搭載(ガチャを回してから100分まで計測可能で,タイムアタックにご利用できます) 6.新出問題判定機能(新出問題か既出問題かの判別ができます) 7.マーク機能(正解した問題等にタップすることでマーキングすることができます) 8.広告無し 9.初級〜上級の排出問題情報(問題と解答一覧付属.問題のTeXファイル付き) 10.アプリ向けに改善されたおいしい数学漸化式のページへのリンク(漸化式未習者でも1から勉強できます) 11.計算用紙機能(Apple純正のPencilKit使用でアプリ内で遅延なく筆記可能,特にiPadでアプリ内で快適に問題が解けます) 12.ダークモード対応(端末に合わせて自動でライトモードとダークモードの切り替えをします) 初めての方はまず「漸化式ガチャ」でGoogle検索しておいしい数学内にあるweb版を無料でご利用し,体験してみてください. X(Twitter)で「漸化式ガチャ」でも是非検索ください. 1度の購入でiPhone,iPad両方でダウンロードして使えるユニバーサルアプリです. おいしい数学X(Twitter)アカウント @oicmath にて,随時開発の情報発信や質問対応等行っております. ※最新のiOS,iPadOSのアップデート対象外の端末では動作保証できませんのでご注意ください. ※当ページ下部の,デベロッパWebサイトのリンクからもアプリの詳細が確認できます.
Structura
Learn chemical reactions by playing a falling-block puzzle game. Combine elements and ions to build compounds, with over 350 reactions covered. Practice recall with quizzes and tests, and experiment freely with all elements.
- Falling-block puzzle gameplay
- Element and ion combination
- 356 chemical reactions covered
- 46 learning stages
- In-game quizzes and tests
- Free experiment mode
- Visual representation of compounds
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LEARN CHEMICAL REACTIONS WITH A FALLING-BLOCK PUZZLE Drop elements and ions, place them side by side, and they combine. H plus O makes −OH. Add another H and you have H₂O. A compound forms only when the bonds and charges add up. Instead of turning textbook pages, you build each reaction with your own hands. WHAT'S INSIDE 356 reactions across inorganic, organic and polymer chemistry (308 in the Codex), in 46 stages. - From atoms to molecules - Making gases, and the halogens - Metals, oxides and industrial methods (contact process, Ostwald process, ammonia-soda process, blast furnace) - Acids, bases, neutralization and salts - Redox and ionization tendency (permanganate, dichromate, iodometric titration) - Metal ion precipitates and complex ions - Aliphatic compounds (oxidizing alcohols, esterification, silver mirror test, iodoform test) - Aromatic compounds (nitration, sulfonation, diazotization, azo dyes, cumene process) - Polymers (sugars, amino acids, protein tests, resins, rubber, vinylon) This app is about reactions. It does not cover calculation topics such as moles, equilibrium, electrochemistry, thermochemistry or crystal lattices. The content follows the Japanese high school chemistry curriculum, so some topics and terms may differ from your course. BUILT TO BE SEEN Benzene is drawn as a hexagon, glucose as a ring, starch as linked rings. Precipitates sink to the bottom and gases escape upward, in their real colors. PRACTICE RECALLING - A 3-question quiz after each stage, with the product hidden - A Test mode in the Codex that masks the products - Reactions you miss come back in later quizzes, and their materials fall more often SET UP THE CONDITIONS YOURSELF Heat, electrolysis, light and catalysts are devices you use on the whole flask. You decide when to use them. FREE EXPERIMENT MODE With the full unlock, choose what falls, in the order you like, and try your own combinations. No targets and no material limit. MEET THE ELEMENTS Each of the 46 stages introduces a character who teaches the key point of that topic, in a short conversation with Mol, an apprentice chemist. PRICING Units 1-3 (14 stages, 91 Codex entries) are free. A one-time purchase unlocks everything else. - No additional charges - No subscriptions - No ads - No gacha - No stamina
Screenshots
Verdict
The clearest difference is price: Structura at Free against 漸化式ガチャ's $6.99. Structura also leads on ads (none vs shown) and update cadence (every 4 days vs fortnightly). 漸化式ガチャ's advantage is in-app purchases (none vs 1). On review sentiment, device support and iOS requirement 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
Structura is free to download; 漸化式ガチャ costs $6.99 up front. Structura sells 1 one-off in-app purchase. 漸化式ガチャ asks for nothing beyond the download.
漸化式ガチャ ships an update fortnightly, Structura every 4 days. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.
| Parameter | 漸化式ガチャ | Structura |
|---|---|---|
| Price | $6.99 | Free — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Update frequency | Fortnightly | Every 4 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 10 MB | 100 MB |
| Age rating | 4+ | 4+ |
| Developer | Akira Hiraoka | SNAPLACE |
Customer experience
漸化式ガチャ
Structura
In-app purchases
漸化式ガチャ
No in-app purchases
Structura
- Unlock All Units$2.99









