Comparison

Four 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

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.

Highlights
  • Interactive 3D engine model
  • Rotate, zoom, and pan views
  • Predefined navigation angles
  • Multilingual support
  • VR mode compatibility
  • Built-in animations and narrations
Features
Read full description

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.

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

Four4 screens
Automobile Engineering Book4 screens

Verdict

The call

The clearest difference is in-app purchases: Four at none against Automobile Engineering Book's 5. Four also leads on ratings volume (96 vs 9) and iOS requirement (8.0 vs 14.0). Automobile Engineering Book's advantage is update cadence (every 5 weeks vs every 7 months) and review sentiment (100% vs 92%). On price, rating, 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

Both are free to download. Automobile Engineering Book sells 4 in-app purchases, starting at $2.99 per 3 months. Four asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Four against 4.6 for Automobile Engineering Book. That said, the two scores are not equally well evidenced: Four has 96 ratings behind it against 9, so its average is the more settled of the two. Written reviews are what separate them: 92% of Four's written reviews are positive against 100% of Automobile Engineering Book's.

UpkeepUpdate frequency

Four ships an update every 7 months, Automobile Engineering Book every 5 weeks. Both last shipped on October 24, 2026.

Scorecard6 real differences · 4 level
Four versus Automobile Engineering Book: the parameters behind the verdict, then further details
ParameterFourAutomobile Engineering Book
PriceFreeFree
Rating4.7 (96 ratings) — better4.6 (9 ratings)
Positive reviews92.0% of reviews100.0% of reviews — better
Number of ratings96 — better9
Update frequencyEvery 7 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better14.0
Further details — not scored
Size183 MB136 MB
Age rating4+4+
DeveloperMOZAIK Education Ltd.Oleksandr Pereshein

Customer experience

Four

All ratings89 ratings
Positive93.3%
Neutral4.5%
Negative2.2%
Written reviews25 reviews
Positive92.0%
Neutral0.0%
Negative8.0%

Automobile Engineering Book

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

In-app purchases

None

Four

No in-app purchases

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 Four free?
Four is free to download, with no in-app purchases.
Is Automobile Engineering Book free?
Automobile Engineering Book is free to download, with in-app purchases available.
Which has better reviews, Four or Automobile Engineering Book?
Four is rated higher. Four averages 4.7 out of 5 from 96 ratings, while Automobile Engineering Book averages 4.6 from 9 ratings.
Do Four or Automobile Engineering Book have ads?
Neither Four nor Automobile Engineering Book shows ads.
Which is updated more often, Four or Automobile Engineering Book?
Four ships an update every 7 months, and Automobile Engineering Book every 5 weeks. Most recently, Four was updated on October 24, 2026 and Automobile Engineering Book on October 24, 2026.

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