Four vs Engine Lab
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Engine Lab
Explore engine mechanics with a touch-first simulator. Build, tune, and test custom engines, observing animations and hearing synthesized exhaust sounds. Export your creations as WAV files.
- Touch-first engine simulation
- Build and save custom engines
- Tune engine parameters
- Simulated dyno pulls
- Crank and piston animation
- Native exhaust synthesis
- Export WAV audio
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Build an engine and hear it run. Engine Lab is a touch-first engine simulator: design anything from a single to a V12, then hear it idle, rev and pull to the limiter, live on your iPhone or iPad. BUILD BENCH • Set the layout, 1 to 12 cylinders, bore, stroke, firing order and redline. • Hear each change as you make it, and hold to rev. • Try different headers, exhausts and mufflers. • Compare against a saved version by ear or on the dyno. SEE IT IN 3D • Every engine, including your own builds, becomes a 3D model driven by the live simulation: pistons, crank, cams, valves and glowing headers. • Orbit, zoom, slow it down, switch between X-ray and solid, and tap any part for live readings. The classic 2D cutaway is one tap away. DRIVE IT • Manual or automatic gearbox with clutch and road speed, plus a gearing chart with top speed in each gear. • Simulated dyno pulls with torque and power curves. • Six built-in engines: Honda B18C5 VTEC, Honda TRX520 single, BMW M52B28, Toyota 2JZ, Audi 2.3 inline-5 and GM LS V8. IMPORT AND SHARE • Import engine-sim .mr scripts and share your builds as .mr files. • Export a WAV recorded by the on-device simulator. No account, network service or microphone permission is required. An optional one-time Pro purchase unlocks advanced tuning and unlimited saved builds; the free plan keeps three. Values are simulated estimates for exploration, not certified engineering measurements.
Screenshots
Verdict
The clearest difference is review sentiment: Four at 92% against Engine Lab's 0%. Four also leads on rating (4.7 vs 3.0) and in-app purchases (none vs 1). Engine Lab's advantage is update cadence (every 9 days vs every 7 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
Both are free to download. Engine Lab sells 1 one-off in-app purchase. Four asks for nothing beyond the download.
Four holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Four has 89 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 92% of Four's written reviews are positive against 0% of Engine Lab's.
Four ships an update every 7 months, Engine Lab every 9 days. The most recent releases landed on October 15, 2026 and October 19, 2026 respectively.
| Parameter | Four | Engine Lab |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (89 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 92.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 89 — better | 1 |
| Update frequency | Every 7 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 8.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 183 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | MOZAIK Education Ltd. | Jan Sokol |
Customer experience
Four
Engine Lab
In-app purchases
Four
No in-app purchases
Engine Lab
- Engine Lab Pro$4.99
Questions
Is Four free?
Is Engine Lab free?
Which has better reviews, Four or Engine Lab?
Do Four or Engine Lab have ads?
Which is updated more often, Four or Engine Lab?
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