Comparison

Trans4motor vs Automobile Engineering Book

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

Automobile Engineering Book

This app provides a comprehensive yet accessible guide to automobile engineering. It covers basic vehicle structure, common malfunctions, and maintenance rules in a clear, engaging format with ample illustrations. Ideal for novice drivers and anyone seeking to understand their car better.

Highlights
  • Basic vehicle structure information
  • Common malfunctions and solutions
  • Operation and maintenance rules
  • Simple language explanations of car systems
  • Extensive illustrative material
Features
Read full description

Getting started on this application, we set a goal to present a rather difficult theoretical course on the automobile engineering in the most accessible form. Basic knowledge of vehicles' structure will supply a novice driver with confidence in the fact that he will be able to control the situation of any breakdown, predict the amount of necessary work at the service station and just can competently exploit its vehicle. The free form of presentation, deprived of a dry technical syllable, and a large amount of illustrative material will facilitate the learning process and will make it rapid and efficient. The tutorial may be useful for students of driving schools, novice drivers and a wide range of readers who want to get basic knowledge about the car. WHAT CAN YOU FIND IN THIS APPLICATION? - Basic information about mechanism of modern cars - List of the most common malfunctions and ways to eliminate them - Operation and maintenance rules of the car - Description of the car systems in simple language - Plenty useful information that allows you to feel confident in any situation THE APPLICATION IS INTENDED FOR: - Students of driving schools and novice drivers - Parents who want to be confident in the high level of preparation of their children - All drivers who want to know more about their iron horse - Service managers (for better mutual understanding with customer) CONTENT: - Introduction - Car History - Body Types of Passenger Cars - Wheel Arrangement - Classification of Cars - Basic Elements of Passenger Car - Layouts of Major Vehicle Component Parts - Basic Technical Specifications of the Car - About Engines in General - Basic Single-Cylinder Internal Combustion Engine - Classifications of Engines - Basic Technical Specifications of Engine - Gas Distribution Mechanism (GDM) - Cylinder Head - Engine Block and Crank Gear - Engine Cooling System - Engine Lubrication System - Air Intake and Exhaust Systems - Feed System (Fuel System). Main Differences Between Gasoline and Diesel Engines - Feed System of Modern Engines - Purpose of Transmission - Manual Transmission - Automatic Transmission - Drive Gear and Differential. Purpose, Arrangement and Types - Drive Shafts and Hinged Joints. Purpose, Arrangement and Types - All-wheel drive cars - Purpose, Arrangement and Types of Car Suspensions - Wheels and Tires. Arrangement, Purpose and Marking - Wheel Alignment Angles - Brake Control. Purpose - Components - Flow Chart. Brake Circuits - Purpose and Operation of the Anti-Lock Braking System - Purpose and Arrangement of Steering - Purpose and Types of Power Steering - Purpose and General Arrangement of the Car Body - Vehicle Aerodynamics - Airbags - Seat Belts and Active Head Restraints - Means of Pedestrian Protection - Child Restraining Devices - Electrical Equipment and Electric Systems. General Information - Battery Pack (Battery). Purpose, Arrangement and Types - Battery Pack Maintenance. Safety Precautions when Servicing the Battery Pack - Ignition System (Gasoline Engines only) - Preheating System - Charging System. Generator, its Arrangement and Operation - Startup System. Starter, its Arrangement and Operation - Exterior Lighting System. Purpose and Operating Principle - Wipers and Washers. Purpose and Operating Principle - Pointers and Indicators - Heating and Air Conditioning System. Purpose, Arrangement and Operating Principle - Precautions when the Car Owner Carries out Maintenance - Operations that Shall Be Performed in order to Maintain the Normal Working Order of the Vehicle - Basic Car Maintenance Operations - Car Maintenance Schedule - Driver’s Memo - Abbreviations - Glossary The most qualitative textbook about automobile engineering 2025! Be careful behind the wheel! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Trans4motor4 screens
Automobile Engineering Book4 screens

Verdict

The call

The clearest difference is price: Automobile Engineering Book at Free against Trans4motor's $2.99. Automobile Engineering Book also leads on review sentiment (100% vs 57%) and rating (4.6 vs 3.7). Trans4motor's advantage is ratings volume (70 vs 9). On update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Automobile Engineering Book is free to download; Trans4motor costs $2.99 up front. Trans4motor sells 1 one-off in-app purchase and Automobile Engineering Book sells 4 in-app purchases, starting at $2.99 per 3 months. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Automobile Engineering Book holds the better App Store score, 4.6 against 3.7. That said, the two scores are not equally well evidenced: Trans4motor has 70 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 57% of Trans4motor's written reviews are positive against 100% of Automobile Engineering Book's.

UpkeepUpdate frequency

Trans4motor ships an update every 2 months, Automobile Engineering Book every 5 weeks. The most recent releases landed on September 21, 2026 and August 4, 2026 respectively.

Scorecard4 real differences · 6 level
Trans4motor versus Automobile Engineering Book: the parameters behind the verdict, then further details
ParameterTrans4motorAutomobile Engineering Book
Price$2.99Free — better
Rating3.7 (70 ratings)4.6 (9 ratings) — better
Positive reviews56.6% of reviews100.0% of reviews — better
Number of ratings70 — better9
Update frequencyEvery 2 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.014.0 — better
Further details — not scored
Size24 MB136 MB
Age rating4+4+
DeveloperKitt Peak, Inc.Oleksandr Pereshein

Customer experience

Trans4motor

All ratings70 ratings
Positive68.6%
Neutral5.7%
Negative25.7%
Written reviews113 reviews
Positive56.6%
Neutral14.2%
Negative29.2%

Automobile Engineering Book

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews14 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Trans4motor

One-time1
  • Add Engine Sound$1.99
4 purchases

Automobile Engineering Book

Subscriptions1
  • Full version3 Days trial2 variants$2.993 Months
One-time3
  • Full version for three months$2.99
  • Full version for one year$4.99
  • Full version forever$6.99

Questions

Is Trans4motor free?
Trans4motor costs $2.99, and also offers in-app purchases.
Is Automobile Engineering Book free?
Automobile Engineering Book is free to download, with in-app purchases available.
Which has better reviews, Trans4motor or Automobile Engineering Book?
Automobile Engineering Book is rated higher. Trans4motor averages 3.7 out of 5 from 70 ratings, while Automobile Engineering Book averages 4.6 from 9 ratings.
Do Trans4motor or Automobile Engineering Book have ads?
Neither Trans4motor nor Automobile Engineering Book shows ads.
Which is updated more often, Trans4motor or Automobile Engineering Book?
Trans4motor ships an update every 2 months, and Automobile Engineering Book every 5 weeks. Most recently, Trans4motor was updated on September 21, 2026 and Automobile Engineering Book on August 4, 2026.

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