Comparison

Trans4motor R vs Structura 元素合成 ― 化学反応を覚えるパズル

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

Head to head
About

Trans4motor R

Explore and animate four-stroke engines with detailed customization options. Simulate transmissions, edit engine specifications, and experience realistic vehicle physics. Share your creations and learn about engine mechanics through interactive tutorials.

Highlights
  • Seamless engine morphing (inline to V, cylinder count, firing intervals)
  • Full transmission visualization (3-shaft, 2-shaft, dog gearbox)
  • Deep engine specification editing
  • Realistic vehicle physics simulation
  • Community sharing platform for engine designs
  • Interactive learning modes (TechTour)
  • Enhanced, realistic engine sound simulation
Currently charting
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The definitive successor to the original Trans4motor is finally here — a new installment that lets you freely explore and animate four-stroke engines on your iPad or iPhone. Created for those who love internal-combustion engines and never tire of their rhythm, mechanics, and beauty. 【Seamless Engine Morphing】 Switch from inline to V configurations, alter bank angles, change cylinder counts, and adjust firing intervals. Every change transforms the engine while it continues running. Camshafts split and merge, crank phasing shifts, valve angles move dynamically — a completely new way to experience engines. 【All-New Transmission Simulation】 For the first time in the series, the gearbox itself is fully visualized. ・3-shaft synchromesh transmission ・2-shaft synchromesh transmission ・Dog gearbox (motorcycle-style) Enter tooth counts manually, or let the app generate realistic gear meshes from gear ratios. Follow shift forks, constant-mesh gears, clutch engagement, and truly see how power flows. 【Deep Engine Specification Editing】 Greatly expanded from the original, allowing a far richer expression of each engine’s character. ・Cylinder count, bore, stroke ・Bank angle, mounting angle ・Firing order, firing interval ・Cam drive (belt / chain / gear) ・Valve train (SOHC / DOHC / OHV / VTEC / Desmodromic) ・Valve diameter and included angle (reflected in the CG model) ・Tire width, aspect ratio, wheel diameter (outer diameter calculated automatically) Recreate everything from spirited singles to distinctive 5-cylinder pulses, modern V4 superbikes, and the bold heartbeat of American V8s. 【Realistic Vehicle Physics】 Not just an animation. Torque curves, vehicle mass, gear ratios, and tire diameter are calculated frame by frame to determine vehicle speed. Shift through the gears and feel how the engine and drivetrain connect as acceleration builds. 【Connect with the “Engines” Sharing Platform】 Share your creations with the world. ・Upload / download ・Share to X (formerly Twitter) ・Community “likes” and voting ・Planned competitions Build a community-driven engine library with fellow enthusiasts. 【GearVision Mode】 Gears, shift forks, clutches — see exactly which components are transmitting power at any moment. A visualized power-flow mode revealing the inner workings of each shift. 【TechTour】 A hands-on learning mode evolved from the series’ interactive tutorials. ・Four-stroke fundamentals ・Firing order ・Synchromesh mechanisms Engines become even more fascinating when you understand how they work. 【Enhanced Engine Sound】 With support from Sound Design Lab LLC, this latest audio method combines single-shot, harmonic, and random-noise components to create a natural and realistic engine presence. Differences in cylinder count and firing intervals come through with greater character and detail. Engine sound is included as a standard feature, not an in-app purchase. 【Preset Engines】 Trans4motor R includes 12 preset engines ranging from classic icons to modern super-sport engines and powerful V8s. ※ For learning and presentation purposes, the engine CG animations run at one-tenth of real-world rotational speed. ※ This app reproduces engines based on publicly available specifications for educational use and is not intended to be an exact replica of actual machinery, dimensions, or designs. ※ Company names and product names mentioned in this app are trademarks or registered trademarks of their respective owners.

About

Structura 元素合成 ― 化学反応を覚えるパズル

Learn chemical reactions through a falling puzzle game. Connect elements and ions to form compounds, with visual representations of structures and interactive quizzes to reinforce learning. Covers inorganic, organic, and polymer reactions.

Highlights
  • Falling puzzle gameplay
  • Visual representation of chemical structures
  • Interactive quizzes
  • Covers inorganic, organic, and polymer reactions
  • Progress tracking for forgotten reactions
  • Element characters with stage-specific tips
Features
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■ 落ちものパズルで、化学反応を覚える 降ってくる元素やイオンを、となりに置いてつなげるだけ。 H と O がくっつけば −OH、そこに H がもう1つで H₂O。 結合手の数と電荷のつじつまが合ったときだけ、物質ができあがります。 覚えるのは「AとBをくっつけると何ができるか」。 教科書のページをめくるかわりに、手を動かして組み立てます。 ■ 収録範囲 無機・有機・高分子の反応 358件(図鑑掲載310件)、46ステージ。 ・原子から分子へ ・気体の製法とハロゲン ・金属、酸化物と工業的製法(接触法・オストワルト法・アンモニアソーダ法・溶鉱炉) ・酸と塩基、中和と塩 ・酸化還元とイオン化傾向(過マンガン酸カリウム・二クロム酸カリウム・ヨウ素滴定) ・金属イオンの沈殿と錯イオン(沈殿の色・系統分離) ・脂肪族(アルコールの酸化・エステル化・銀鏡反応・ヨードホルム反応) ・芳香族(ニトロ化・スルホン化・ジアゾ化・アゾ染料・クメン法) ・高分子(糖・アミノ酸・タンパク質の呈色反応・合成樹脂・ゴム・ビニロン) ※ 本作が扱うのは「反応」です。mol計算・化学平衡・電気化学・熱化学・結晶格子といった   理論化学の計算問題は収録していません。 ■ 見ればわかる形にしています ベンゼン環は六角形、グルコースは環、デンプンは環が3つつながった鎖。 用語だけを並べず、構造を絵で描いています。 沈殿は底に沈み、気体は上へ抜けていきます。色もそのまま。 ■ 思い出す練習ができます 眺めるだけでは「見ればわかる」で終わります。 ・ステージクリアごとに小テスト(3問)。生成物を隠して4択で答える ・図鑑の「テスト」ボタンで、覚えた反応の生成物を伏せ字にできる ・間違えた反応は記録され、次の小テストで優先的に出題される ・さらに、その材料が盤面に落ちやすくなる。忘れたころに手が触れます ■ 元素のキャラクター 46ステージそれぞれに、その単元の勘所を教えてくれる相手が出てきます。 ナトリウムは黄色い炎をまとい、フッ素はいちばん強い酸化力を誇り、 シリカゲルは水を飲みほす石として現れます。 主人公「モル」との短い会話から、各ステージが始まります。 ■ 料金 単元1〜3(14ステージ・図鑑93件)は無料。気体の製法まで丸ごと遊べます。 残りは買い切り¥500で全部開放されます。 ・追加課金なし ・サブスクなし ・広告なし ・ガチャなし ・スタミナなし(好きなだけ遊べます) ■ こんな人に ・無機化学の暗記が苦手で、手が止まっている ・沈殿の色や気体の製法がなかなか定着しない ・有機の反応系統を、系統として頭に入れたい ・すきま時間に、片手で復習したい

Screenshots

Trans4motor R4 screens
Structura 元素合成 ― 化学反応を覚えるパズル4 screens

Verdict

The call

The clearest difference is price: Structura 元素合成 ― 化学反応を覚えるパズル at Free against Trans4motor R's $7.99. Structura 元素合成 ― 化学反応を覚えるパズル also leads on review sentiment (100% vs 64%). Trans4motor R's advantage is in-app purchases (none vs 1) and chart position (#170 vs unranked). On update cadence, ads, 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

CostPrice · In-app purchases · Ads · Monetization

Structura 元素合成 ― 化学反応を覚えるパズル is free to download; Trans4motor R costs $7.99 up front. Structura 元素合成 ― 化学反応を覚えるパズル sells 1 one-off in-app purchase. Trans4motor R asks for nothing beyond the download.

UpkeepUpdate frequency

Trans4motor R ships an update every 2 weeks, Structura 元素合成 ― 化学反応を覚えるパズル weekly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 6 level
Trans4motor R versus Structura 元素合成 ― 化学反応を覚えるパズル: the parameters behind the verdict, then further details
ParameterTrans4motor RStructura 元素合成 ― 化学反応を覚えるパズル
Price$7.99Free — better
Rating4.6 (11 ratings) — better—
Positive reviews64.0% of reviews100.0% of reviews — better
Number of ratings11 — better—
Update frequencyEvery 2 weeksWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#170 — better—
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better17.0
Further details — not scored
Size178 MB99 MB
Age rating4+4+
DeveloperKitt Peak, Inc.SNAPLACE LLC

Customer experience

Trans4motor R

All ratings11 ratings
Positive90.9%
Neutral0.0%
Negative9.1%
Written reviews25 reviews
Positive64.0%
Neutral16.0%
Negative20.0%

Structura 元素合成 ― 化学反応を覚えるパズル

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Trans4motor R

No in-app purchases

1 purchases

Structura 元素合成 ― 化学反応を覚えるパズル

One-time1
  • 全単元を解放$2.99

Questions

Is Trans4motor R free?
Trans4motor R costs $7.99, with no in-app purchases.
Is Structura 元素合成 ― 化学反応を覚えるパズル free?
Structura 元素合成 ― 化学反応を覚えるパズル is free to download, with in-app purchases available.
Do Trans4motor R or Structura 元素合成 ― 化学反応を覚えるパズル have ads?
Neither Trans4motor R nor Structura 元素合成 ― 化学反応を覚えるパズル shows ads.
Which is updated more often, Trans4motor R or Structura 元素合成 ― 化学反応を覚えるパズル?
Trans4motor R ships an update every 2 weeks, and Structura 元素合成 ― 化学反応を覚えるパズル weekly. Most recently, Trans4motor R was updated on October 30, 2026 and Structura 元素合成 ― 化学反応を覚えるパズル on October 31, 2026.

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