無機化学 vs Structura
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
無機化学
This app helps high school students memorize inorganic chemistry concepts. It covers reaction principles, metallic elements, and non-metallic elements, utilizing a red-sheet overlay for easy output and review. User feedback is actively incorporated for improvements.
- Red sheet overlay for output practice
- Comprehensive inorganic chemistry content
- Covers reaction principles
- Covers metallic elements
- Covers non-metallic elements
- User feedback integration
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高校生の時、欲しかったアプリを作りました。 ・赤シートで、楽にアウトプット ・高校無機化学の内容を網羅(反応原理、金属元素、非金属元素) ・あなたの要望を聞かせてください。反映します。 利用規約:https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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 update cadence: Structura at every 4 days against 無機化学's every 2 months. Structura also leads on review sentiment (100% vs 86%) and iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and monetization model 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. 無機化学 sells 3 in-app purchases, starting at $1.99 per month and Structura sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
無機化学 ships an update every 2 months, Structura every 4 days. Both last shipped on November 8, 2026.
| Parameter | 無機化学 | Structura |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 86.4% of reviews | 100.0% of reviews — better |
| Update frequency | Every 2 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Freemium |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 100 MB |
| Age rating | 4+ | 4+ |
| Developer | Akihiko Kitamura | SNAPLACE |
Customer experience
無機化学
Structura
In-app purchases
無機化学
- Pro - 1ヶ月$1.991 Month
- Pro - 6ヶ月$11.996 Months
- Pro - 12ヶ月$19.991 Year
Structura
- Unlock All Units$2.99








