# Skyline Drone 無人機 vs Engine Lab

The clearest difference is in-app purchases: Skyline Drone 無人機 at none against Engine Lab's 1. Skyline Drone 無人機 also leads on iOS requirement (15.0 vs 18.0). Engine Lab's advantage is update cadence (every 9 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Engine Lab sells 1 one-off in-app purchase. Skyline Drone 無人機 asks for nothing beyond the download.

Skyline Drone 無人機 ships an update every 2 months, Engine Lab every 9 days. The most recent releases landed on October 10, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Skyline Drone 無人機 | Engine Lab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/engine-lab-simulator-and-sound/id6790748979/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 408 MB | 14 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Jon-Chao Hong](https://appshunter.io/developer/547495524) | [Jan Sokol](https://appshunter.io/developer/1896490456) |

## What reviewers say

### Skyline Drone 無人機

[App page](https://appshunter.io/ios/app/skyline-drone/id6759943191)

**In-app purchases:** none


### Engine Lab

[App page](https://appshunter.io/ios/app/engine-lab-simulator-and-sound/id6790748979)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Engine Lab Pro | $4.99 | one-time |


## Frequently asked questions

### Is Skyline Drone 無人機 free?

Skyline Drone 無人機 is free to download, with no in-app purchases.

### Is Engine Lab free?

Engine Lab is free to download, with in-app purchases available.

### Do Skyline Drone 無人機 or Engine Lab have ads?

Neither Skyline Drone 無人機 nor Engine Lab shows ads.

### Which is updated more often, Skyline Drone 無人機 or Engine Lab?

Skyline Drone 無人機 ships an update every 2 months, and Engine Lab every 9 days. Most recently, Skyline Drone 無人機 was updated on October 10, 2026 and Engine Lab on October 19, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*