# UnitConverter byNSDev vs Unit Converter and Calculator.

The clearest difference is in-app purchases: UnitConverter byNSDev at none against Unit Converter and Calculator.'s 1. UnitConverter byNSDev also leads on ads (none vs shown). Unit Converter and Calculator.'s advantage is update cadence (monthly vs every 5 months) and review sentiment (28% vs 20%). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Unit Converter and Calculator. sells 1 one-off in-app purchase. UnitConverter byNSDev asks for nothing beyond the download.

UnitConverter byNSDev ships an update every 5 months, Unit Converter and Calculator. monthly. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | UnitConverter byNSDev | Unit Converter and Calculator. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (84 ratings)](https://appshunter.io/ios/app/unit-converter-and-calculator/id1559358634/reviews)** |
| Number of ratings | — | **84** |
| Positive reviews | 20.0% of reviews | **28.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 20 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NIHON SYSTEM DEVELOPER CORPORATION](https://appshunter.io/developer/1198103734) | [Kemal Bakacak](https://appshunter.io/developer/1475963902) |

## 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


### Unit Converter and Calculator.

[App page](https://appshunter.io/ios/app/unit-converter-and-calculator/id1559358634)

Effortlessly convert between over 1450 units across more than 70 categories with this intuitive and fast mobile application. It offers real-time conversions, offline access, and customizable settings for students, professionals, and travelers.

**Highlights:** Real-time conversions, Offline access, Over 70 categories, More than 1450 units, Customizable settings, Dark mode support, Favorite units list

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium, All Calculation Units | $2.99 | one-time |


## Frequently asked questions

### Is UnitConverter byNSDev free?

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

### Is Unit Converter and Calculator. free?

Unit Converter and Calculator. is free to download, with in-app purchases available.

### Do UnitConverter byNSDev or Unit Converter and Calculator. have ads?

Unit Converter and Calculator. shows ads; UnitConverter byNSDev does not.

### Which is updated more often, UnitConverter byNSDev or Unit Converter and Calculator.?

UnitConverter byNSDev ships an update every 5 months, and Unit Converter and Calculator. monthly. Most recently, UnitConverter byNSDev was updated on November 2, 2026 and Unit Converter and Calculator. on November 7, 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.*