# Horizontal Accelerometer vs NAC

The clearest difference is in-app purchases: Horizontal Accelerometer at none against NAC's 1. NAC's advantage is ads (none vs shown) and update cadence (fortnightly vs every 6 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. NAC sells 1 in-app purchase, starting at $199.00 per year. Horizontal Accelerometer asks for nothing beyond the download.

Horizontal Accelerometer ships an update every 6 weeks, NAC fortnightly. The most recent releases landed on September 12, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Horizontal Accelerometer | NAC |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | Ad-supported | — |
| Size | 6 MB | 3 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takao Ichimura](https://appshunter.io/developer/1474061593) | [Neubert Aero Corp](https://appshunter.io/developer/1785752651) |

## What reviewers say

### Horizontal Accelerometer

[App page](https://appshunter.io/ios/app/horizontal-accelerometer/id6444095874)

This tool measures real-time horizontal acceleration, deceleration, and lateral G-force for automobiles. It features color-coded zones and sounds for easy understanding while driving and can also be used for engineering education and evaluating structural rigidity.

**Highlights:** Real-time horizontal acceleration measurement, Measures deceleration and lateral G-force, Color zones and sound alerts for values, Calibration for accurate readings, Peak hold and max value tracking, Adjustable color zone thresholds and sound

**Features:** Vision Pro support

**In-app purchases:** none


### NAC

[App page](https://appshunter.io/ios/app/nac-dfd-decelerometer/id6478895830)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| U.S. Region | $199.00 | per year |


## Frequently asked questions

### Is Horizontal Accelerometer free?

Horizontal Accelerometer is free to download, with no in-app purchases.

### Is NAC free?

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

### Do Horizontal Accelerometer or NAC have ads?

Horizontal Accelerometer shows ads; NAC does not.

### Which is updated more often, Horizontal Accelerometer or NAC?

Horizontal Accelerometer ships an update every 6 weeks, and NAC fortnightly. Most recently, Horizontal Accelerometer was updated on September 12, 2026 and NAC on September 14, 2026.

---

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