Trans4motor vs Four
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Trans4motor
Explore the mechanics of 4-stroke engines with this interactive simulator. Visualize the transformation of various engine types and understand their internal workings through detailed CG animation. Enhance your knowledge with adjustable settings and realistic engine sound options.
- Multi-cylinder engine transformation
- Realistic engine sound (in-app purchase)
- Accelerator control simulation
- Expandable engine library
- Custom engine registration and editing
- Interactive educational videos
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Trans4motor is a simulator where you can control the movements of single cylinder to 12 cylinder 4 stroke engines on the iPad/iPhone. Recommended to anyone interested in car and motorcycle engines. This is for those who have a relentless love for engines and want to enhance their knowledge. #3 Top Paid iPad App in Japan #5 Top Paid iPhone App in Japan https://www.youtube.com/user/Trans4motor https://www.facebook.com/Trans4motor Features 1) Seamlessly transforms into different type of engines Select from inline to V-type, or other multi-cylinder engines, and watch the running engines transform over continuous CG animation. Enjoy watching the inline engine camshaft separate into two parts as it transforms into the V-type engine and how phase angle modulation between cylinders makes the crankshaft rotate, separate, and combine into many engine formations. 2) Add Engine Sound (In-App Purchase) Developed in technical collaboration with "CAI MEDIA CO.,LTD.", the developer of the iPhone app featuring innovative synthetic engine sound, "RealEngineSim" this new feature will add a variety of realistic engine sounds ranging from different number of cylinders to explosions with unequal intervals and cylinder rest. Engine Sound Add-On is available via In-App Purchase. 3) Accelerator Control Accelerator control is available during engine sound replay. Tilt iPhone to different degrees as if pressing the accelerator pedal. Tilt forward horizontally (as if pressing the accelerator) to activate the accelerator, and erect vertically (as if releasing the accelerator) to deactivate it. Furthermore, you can race the engine by tapping the center of rev counter. 4) Addition/expansion of engines There are currently 22 types of engines registered. Through automatic network updates, continuous expansion is planned. In addition, there are functions installed that allow users to newly register and edit engines. Able to adjust setting for engine bore stroke, firing order, and ignition timing. Easily replicate on the iPad, engines with unequal combustion intervals for two-wheelers, Inline-four crossplane or V5. 5) Interactive Movie ·Four-stroke engines ·Firing Order ·V Angle Recorded 3 controllable presentation videos. The company and product names used within the application are generally registered trademarks or trademarks of the respective companies. The objective of this application is to upload engine specifications disclosed to the public and to learn about general information regarding engines. It does not accurately replicate actual machine measurements and designs. The CG animated engine rotates at one tenth of the actual speed to enable users to learn the structure and to enjoy the visual.
Four
Explore the inner workings of a four-stroke Otto engine through interactive 3D animations. This app offers an engaging way to learn about automotive technology with features like rotation, zooming, and predefined views. It's designed for students but enjoyable for all ages, with multilingual support and VR capabilities.
- Interactive 3D engine model
- Rotate, zoom, and pan views
- Predefined navigation angles
- Multilingual support
- VR mode compatibility
- Built-in animations and narrations
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Four-stroke Otto engine This animation demonstrates the type of engine most commonly used in cars. Explore technology with our interactive 3D animations! Be actively involved in learning about technology by following the latest results of 3D animation. Our 3D scenes have been designed for students between 8 and 18 years of age but can be interesting for everyone. Available languages: English, Deutsch, Français, Español, Русский, العربية, 日本語, 中文, 한국어, Italiano, Português, Svenska, Nederlands, Norsk, Polski, Magyar, Türkçe, Română. With the mozaik3D App, available in the AppStore, you can access more than 1200 similar 3D scenes. Mozaik Interactive 3D Our fully interactive scenes can be rotated, enlarged or viewed from pre-set angles. With the predefined views, you can easily navigate through the complex scenes. Some of the 3D scenes contain a Walk mode, enabling you to explore the scene yourself. Most of our 3D scenes include narrations and built-in animations. They also contain captions, entertaining animated quizzes and other visual elements. The 3D scenes are available in several languages, which also offers an opportunity to learn and practice foreign languages. Usage and navigation Rotate the scene by dragging your finger. Zoom the scene in or out by pinching with your fingers. Pan the view by dragging with three fingers. Tap the buttons at the bottom to switch between predefined views. You can change the language and set other functions in the context menu. The context menu can be accessed by touching the bottom corners. Activate VR mode by pressing the VR goggles icon in the bottom right corner. In VR mode, tilt your head to right or left display the navigation panel.
Screenshots
Verdict
The clearest difference is price: Four at Free against Trans4motor's $2.99. Four also leads on rating (4.7 vs 3.7) and review sentiment (92% vs 56%). Trans4motor's advantage is update cadence (every 2 months vs every 7 months). On ratings volume, ads 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
Four is free to download; Trans4motor costs $2.99 up front. Trans4motor sells 1 one-off in-app purchase. Four asks for nothing beyond the download.
Four holds the better App Store score, 4.7 against 3.7. Both are backed by a comparable volume of ratings — 70 and 89 respectively. Written reviews point the same way: 56% of Trans4motor's written reviews are positive against 92% of Four's.
Trans4motor ships an update every 2 months, Four every 7 months. The most recent releases landed on October 15, 2026 and October 7, 2026 respectively.
| Parameter | Trans4motor | Four |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.7 (70 ratings) | 4.7 (89 ratings) — better |
| Positive reviews | 56.1% of reviews | 92.0% of reviews — better |
| Number of ratings | 70 | 89 — better |
| Update frequency | Every 2 months — better | Every 7 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 24 MB | 183 MB |
| Age rating | 4+ | 4+ |
| Developer | Kitt Peak, Inc. | MOZAIK Education Ltd. |
Customer experience
Trans4motor
Four
In-app purchases
Trans4motor
- Add Engine Sound$1.99
Four
No in-app purchases
Questions
Is Trans4motor free?
Is Four free?
Which has better reviews, Trans4motor or Four?
Do Trans4motor or Four have ads?
Which is updated more often, Trans4motor or Four?
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