# Engine Simulator vs Unlokee

The clearest difference is rating: Unlokee at 5.0 against Engine Simulator's 4.2. Unlokee also leads on update cadence (every 2 days vs every 3 weeks) and review sentiment (100% vs 79%). Engine Simulator's advantage is ratings volume (136 vs 1) and chart position (#60 vs unranked). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Engine Simulator sells 1 one-off in-app purchase and Unlokee sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Unlokee holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Engine Simulator has 136 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 79% of Engine Simulator's written reviews are positive against 100% of Unlokee's.

Engine Simulator ships an update every 3 weeks, Unlokee every 2 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Engine Simulator | Unlokee |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (136 ratings)](https://appshunter.io/ios/app/engine-simulator/id6772016143/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/unlokee-lock-picking-puzzle/id6808786210/reviews)** |
| Number of ratings | **136** | 1 |
| Positive reviews | 78.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#60** | — |
| Size | 22 MB | 36 MB |
| Requires iOS | 18.6 | **18.0** |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [MUHAMMAD SAAD ATA](https://appshunter.io/developer/6772016385) | [Dmitrii Rozhkov](https://appshunter.io/developer/1849770909) |

## What reviewers say

### Engine Simulator

[App page](https://appshunter.io/ios/app/engine-simulator/id6772016143)

**Currently charting:** #60 Top Grossing · Racing, #77 Top Free · Racing (US App Store)

Explore the physics of piston engines by building, tuning, and testing them. Simulate combustion and rigid body motion in real-time. Compete with others on a global leaderboard by posting your creations.

**Highlights:** Physics-based engine simulation, Build engines from scratch, Tune fuel and ignition maps, Real-time power and torque readings, 3D engine visualization, Global leaderboard

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $8.99 | one-time |


### Unlokee

[App page](https://appshunter.io/ios/app/unlokee-lock-picking-puzzle/id6808786210)

Engage in a tactile 3D lock-picking simulation that tests your patience and precision. Master various lock mechanisms through a progressive campaign and unlock new challenges. Experience satisfying feedback as you learn to manipulate pins and tension.

**Highlights:** Tactile 3D lock-picking simulation, Progressive campaign with 40+ locks, Cutaway view for mechanism inspection, Haptic and visual feedback, Multiple lock mechanism types, Random lock generation, Timed challenges

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Game | $7.99 | one-time |


## Frequently asked questions

### Is Engine Simulator free?

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

### Is Unlokee free?

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

### Which has better reviews, Engine Simulator or Unlokee?

Unlokee is rated higher. Engine Simulator averages 4.2 out of 5 from 136 ratings, while Unlokee averages 5.0 from 1 ratings.

### Do Engine Simulator or Unlokee have ads?

Neither Engine Simulator nor Unlokee shows ads.

### Which is updated more often, Engine Simulator or Unlokee?

Engine Simulator ships an update every 3 weeks, and Unlokee every 2 days. Most recently, Engine Simulator was updated on October 25, 2026 and Unlokee on October 24, 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.*