Comparison

Trans4motor vs Engine LD

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

Head to head
About

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.

Highlights
  • Multi-cylinder engine transformation
  • Realistic engine sound (in-app purchase)
  • Accelerator control simulation
  • Expandable engine library
  • Custom engine registration and editing
  • Interactive educational videos
Read full description

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.

About

Engine LD

Features
Read full description

Engine Layout Definitions (Engine LD) Understand how piston–crank geometry impacts engine performance. • Explore how layout changes affect engine displacement, rated power, and dynamic forces. • View detailed graphs and data lists: • Displacement volume vs. crank angle • Dynamic forces vs. crank angle • Export values for spreadsheet analysis or basic FEA (finite element analysis). • Interactive simulation: adjust crank rotation with a slider to visualize dimension effects on engine packaging.

Screenshots

Trans4motor4 screens
Engine LD4 screens

Verdict

The call

The clearest difference is in-app purchases: Engine LD at none against Trans4motor's 1. Engine LD also leads on iOS requirement (13.0 vs 15.0). Trans4motor's advantage is update cadence (every 2 months vs every 5 months). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Trans4motor costs $2.99 and Engine LD $2.99 up front. Trans4motor sells 1 one-off in-app purchase. Engine LD asks for nothing beyond the download.

UpkeepUpdate frequency

Trans4motor ships an update every 2 months, Engine LD every 5 months. The most recent releases landed on September 21, 2026 and September 22, 2026 respectively.

Scorecard3 real differences · 7 level
Trans4motor versus Engine LD: the parameters behind the verdict, then further details
ParameterTrans4motorEngine LD
Price$2.99$2.99
Rating3.7 (70 ratings) — better—
Positive reviews56.6% of reviews—
Number of ratings70 — better—
Update frequencyEvery 2 months — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size24 MB10 MB
Age rating4+4+
DeveloperKitt Peak, Inc.DRH YAZILIM VE MUHENDISLIK HIZMETLERI LTD STI

In-app purchases

1 purchases

Trans4motor

One-time1
  • Add Engine Sound$1.99
None

Engine LD

No in-app purchases

Questions

Is Trans4motor free?
Trans4motor costs $2.99, and also offers in-app purchases.
Is Engine LD free?
Engine LD costs $2.99, with no in-app purchases.
Do Trans4motor or Engine LD have ads?
Neither Trans4motor nor Engine LD shows ads.
Which is updated more often, Trans4motor or Engine LD?
Trans4motor ships an update every 2 months, and Engine LD every 5 months. Most recently, Trans4motor was updated on September 21, 2026 and Engine LD on September 22, 2026.

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