# LED System vs OBD2 Scanner + Engine Sound

The clearest difference is in-app purchases: LED System at none against OBD2 Scanner + Engine Sound's 2. LED System also leads on ads (none vs shown) and iOS requirement (15 vs 17.0). On price, update cadence and device support there is nothing between them.

Both are free to download. OBD2 Scanner + Engine Sound sells 2 one-off in-app purchases. LED System asks for nothing beyond the download.

LED System ships an update weekly, OBD2 Scanner + Engine Sound every 9 days. The most recent releases landed on October 2, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | LED System | OBD2 Scanner + Engine Sound |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/obd2-scanner-plus-engine-sound/id6789023964/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 9 days |
| Monetization | — | Free with in-app purchases |
| Size | 64 MB | 6 MB |
| Requires iOS | **15** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [深圳市流明电子有限公司](https://appshunter.io/developer/1031986405) | [Sena Takasawa](https://appshunter.io/developer/1887478690) |

## What reviewers say

### LED System

[App page](https://appshunter.io/ios/app/led-system/id6670427885)

**Features:** macOS Compatibility

**In-app purchases:** none


### OBD2 Scanner + Engine Sound

[App page](https://appshunter.io/ios/app/obd2-scanner-plus-engine-sound/id6789023964)

Monitor your car's engine performance and hear its sound in real-time. Customize your dashboard with various widgets and track your drives with detailed maps and trip data. Offers a demo mode and optional Pro features for an enhanced experience.

**Highlights:** Real-time OBD2 data display, Engine sound simulation based on RPM, Customizable dashboard with widgets, Trip computer and fuel economy tracking, Speed and RPM on map view, HUD mode for windshield projection

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |
| car_ui Pro (One-Time) | $4.99 | one-time |


## Frequently asked questions

### Is LED System free?

LED System is free to download, with no in-app purchases.

### Is OBD2 Scanner + Engine Sound free?

OBD2 Scanner + Engine Sound is free to download, with in-app purchases available.

### Do LED System or OBD2 Scanner + Engine Sound have ads?

OBD2 Scanner + Engine Sound shows ads; LED System does not.

### Which is updated more often, LED System or OBD2 Scanner + Engine Sound?

LED System ships an update weekly, and OBD2 Scanner + Engine Sound every 9 days. Most recently, LED System was updated on October 2, 2026 and OBD2 Scanner + Engine Sound on October 16, 2026.

---

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