# DOKKAN calculator vs Horizontal Accelerometer

The clearest difference is update cadence: DOKKAN calculator at every 5 days against Horizontal Accelerometer's every 6 weeks. Horizontal Accelerometer's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DOKKAN calculator ships an update every 5 days, Horizontal Accelerometer every 6 weeks. The most recent releases landed on December 8, 2025 and September 12, 2026 respectively.

## The numbers

| Metric | DOKKAN calculator | Horizontal Accelerometer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 5 days** | Every 6 weeks |
| Monetization | — | Ad-supported |
| Size | 7 MB | 6 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takahiro Yoshii](https://appshunter.io/developer/1619002884) | [Takao Ichimura](https://appshunter.io/developer/1474061593) |

## What reviewers say

### DOKKAN calculator

[App page](https://appshunter.io/ios/app/dokkan-calculator/id1624962580)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is DOKKAN calculator free?

DOKKAN calculator is free to download, with no in-app purchases.

### Is Horizontal Accelerometer free?

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

### Do DOKKAN calculator or Horizontal Accelerometer have ads?

Both DOKKAN calculator and Horizontal Accelerometer show ads.

### Which is updated more often, DOKKAN calculator or Horizontal Accelerometer?

DOKKAN calculator ships an update every 5 days, and Horizontal Accelerometer every 6 weeks. Most recently, DOKKAN calculator was updated on December 8, 2025 and Horizontal Accelerometer on September 12, 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.*