# ENGINE 3D — Explore engines in motion

> Explore engines in motion (iPhone/iPad app by Kouki Ohta.)

- Source: https://appshunter.io/ios/app/engine-3d/id6824160236 (this page in markdown: same URL + `.md`)
- Developer: [Kouki Ohta](https://appshunter.io/developer/6786263873)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 10 MB
- Languages: American English, Japanese
- Released: 2026-10-30
- Data updated: 2026-11-03

## What is ENGINE 3D?

Where does fuel go before it burns? How does an engine turn the wheels?

ENGINE 3D lets you explore the moving mechanisms inside cars and motorcycles. See through the body, move closer to individual parts, and follow the connections between fuel, combustion, and power.

FOLLOW FUEL AND POWER
Trace fuel from the tank through intake, combustion, and exhaust. Watch power travel from the crankshaft through the clutch and transmission to the wheels. Color and animation reveal how the whole vehicle connects. Automatic guides take you through each route.

WATCH COMBUSTION IN SLOW MOTION
Observe intake, compression, combustion, and exhaust with the current stage shown on screen. Compare four-stroke, two-stroke, and rotary engines through their internal motion.

TAKE THE CONTROLS
Use the throttle, clutch, and gears to change engine speed and drivetrain motion. Drag to rotate and pinch to zoom. Explore in portrait or landscape on iPhone and iPad.

ONE CAR AND ONE MOTORCYCLE, FREE
• Inline-four motorcycle
• Inline-six car

ENGINE PACK VOL.1: FIVE VEHICLES, ONE PURCHASE
• Two-stroke triple motorcycle
• 90° L-twin motorcycle
• Twin-rotor car
• Flat-six car
• Oval-piston V4 motorcycle

The pack includes the five vehicles listed above. Future additions are not included. No subscription. Restore purchased vehicles with the same Apple Account. Prices are shown in the app before purchase.

Available in English and Japanese. All 3D models are included in the app for offline viewing. Purchases and restoration require an internet connection.

Vehicles are original educational models. Some mechanisms and motion are simplified for clarity; the app is not a vehicle repair manual.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Engine Pack Vol.1 | $6.99 | one-time |


## Is ENGINE 3D safe?

Not enough ratings yet to assess ENGINE 3D.

## Is ENGINE 3D legit?

ENGINE 3D appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for ENGINE 3D is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-31

No release notes.

## More apps by Kouki Ohta

- [Ruimy](https://appshunter.io/ios/app/ruimy/id6786263871)
- [二字熟語パズル](https://appshunter.io/ios/app/id6787715111)
- [Nishikigoi Pond](https://appshunter.io/ios/app/nishikigoi-pond/id6789128188)
- [Hanabi Night − Fireworks](https://appshunter.io/ios/app/hanabi-night-fireworks/id6789539167)
- [Hamon − Forge Japanese Swords](https://appshunter.io/ios/app/hamon-forge-japanese-swords/id6789869495)
- [対面麻雀ノート](https://appshunter.io/ios/app/id6790881727)

All apps by Kouki Ohta: https://appshunter.io/developer/6786263873

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-03.*