# UnitConverter byNSDev vs Horizon Detection

The clearest difference is ads: UnitConverter byNSDev at none against Horizon Detection's shown. UnitConverter byNSDev also leads on review sentiment (20% vs 0%) and monetization model (free vs ad-supported). Horizon Detection's advantage is update cadence (fortnightly vs every 5 months). On price and in-app purchases there is nothing between them.

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

UnitConverter byNSDev ships an update every 5 months, Horizon Detection fortnightly. The most recent releases landed on October 4, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | UnitConverter byNSDev | Horizon Detection |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/horizon-detection/id6511216202/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **20.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Fortnightly** |
| Monetization | **Free** | Ad-supported |
| Size | 4 MB | 35 MB |
| Requires iOS | **15.6** | 17.7.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [NIHON SYSTEM DEVELOPER CORPORATION](https://appshunter.io/developer/1198103734) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### UnitConverter byNSDev

[App page](https://appshunter.io/ios/app/unitconverter-bynsdev/id1229121492)

This tool converts between 26 different types of units, displaying conversion rates and allowing you to specify decimal places. It supports a vast array of units across categories like length, mass, volume, and more.

**Highlights:** Converts 26 types of units, Displays conversion rates, Customizable decimal places, Supports numerous units in various categories, User-submitted unit requests

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

**In-app purchases:** none


### Horizon Detection

[App page](https://appshunter.io/ios/app/horizon-detection/id6511216202)

This utility app identifies and highlights horizontal lines within an image. It's designed for users who need to analyze visual data for straight horizontal elements.

**Highlights:** Detects horizontal lines, Highlights detected lines, Image analysis tool, Simple interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is UnitConverter byNSDev free?

UnitConverter byNSDev is free to download, with no in-app purchases.

### Is Horizon Detection free?

Horizon Detection is free to download, with no in-app purchases.

### Do UnitConverter byNSDev or Horizon Detection have ads?

Horizon Detection shows ads; UnitConverter byNSDev does not.

### Which is updated more often, UnitConverter byNSDev or Horizon Detection?

UnitConverter byNSDev ships an update every 5 months, and Horizon Detection fortnightly. Most recently, UnitConverter byNSDev was updated on October 4, 2026 and Horizon Detection on October 1, 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.*