# Unit Converter vs Optic Master

The clearest difference is update cadence: Optic Master at daily against Unit Converter's every 13 months. Optic Master also leads on iOS requirement (15.0 vs 26.0). 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.

Unit Converter ships an update every 13 months, Optic Master daily. Both last shipped on October 24, 2026.

## The numbers

| Metric | Unit Converter | Optic Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/unit-converter-convertly/id6739451660/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Daily** |
| Monetization | Free | — |
| Size | 0 MB | 43 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Maarten Borsje](https://appshunter.io/developer/1650073735) | [威 何](https://appshunter.io/developer/1876701305) |

## What reviewers say

### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-convertly/id6739451660)

Easily switch between metric and imperial measurements for length, area, mass, temperature, and more. This tool offers quick, accurate conversions with an intuitive interface and offline functionality.

**Highlights:** 15+ unit categories, Metric and imperial support, Quick and precise conversions, Intuitive interface, Conversion history, Offline functionality

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

**In-app purchases:** none


### Optic Master

[App page](https://appshunter.io/ios/app/optic-master/id6759948394)

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

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter free?

Unit Converter is free to download, with no in-app purchases.

### Is Optic Master free?

Optic Master is free to download, with no in-app purchases.

### Do Unit Converter or Optic Master have ads?

Neither Unit Converter nor Optic Master shows ads.

### Which is updated more often, Unit Converter or Optic Master?

Unit Converter ships an update every 13 months, and Optic Master daily. Most recently, Unit Converter was updated on October 24, 2026 and Optic Master on October 24, 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.*