# OBD2 Scanner + Engine Sound vs Top Kids

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

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

OBD2 Scanner + Engine Sound ships an update every 9 days, Top Kids every 6 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | OBD2 Scanner + Engine Sound | Top Kids |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 9 days | **Every 6 days** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 44 MB |
| Requires iOS | **17.0** | 18.4 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sena Takasawa](https://appshunter.io/developer/1887478690) | [SAGA FOR SOLUTIONS](https://appshunter.io/developer/1724574145) |

## What reviewers say

### 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 |


### Top Kids

[App page](https://appshunter.io/ios/app/top-kids/id6803709864)

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

**In-app purchases:** none


## Frequently asked questions

### Is OBD2 Scanner + Engine Sound free?

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

### Is Top Kids free?

Top Kids is free to download, with no in-app purchases.

### Do OBD2 Scanner + Engine Sound or Top Kids have ads?

OBD2 Scanner + Engine Sound shows ads; Top Kids does not.

### Which is updated more often, OBD2 Scanner + Engine Sound or Top Kids?

OBD2 Scanner + Engine Sound ships an update every 9 days, and Top Kids every 6 days. Most recently, OBD2 Scanner + Engine Sound was updated on October 25, 2026 and Top Kids on October 25, 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.*