# UNITS MASTER vs Scale

The clearest difference is rating: Scale at 5.0 against UNITS MASTER's 4.3. Scale also leads on update cadence (every 8 days vs every 4 months) and price ($2.99 vs $6.99). UNITS MASTER's advantage is review sentiment (75% vs 67%) and device support (4 vs 2). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

UNITS MASTER costs $6.99 and Scale $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scale holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 6 and 4 respectively. Written reviews complicate that: 75% of UNITS MASTER's written reviews are positive against 67% of Scale's, so the app with the better star average is not the one people write more warmly about.

UNITS MASTER ships an update every 4 months, Scale every 8 days. The most recent releases landed on September 10, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | UNITS MASTER | Scale |
| --- | --- | --- |
| Price | $6.99 | **$2.99** |
| Rating | [4.3 (6 ratings)](https://appshunter.io/ios/app/units-master/id1428926317/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/scale-o-tron/id1441824327/reviews)** |
| Number of ratings | **6** | 4 |
| Positive reviews | **75.0% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 8 days** |
| Monetization | Paid | Paid |
| Size | 13 MB | 58 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Intemodino Group s.r.o.](https://appshunter.io/developer/557849644) | [Mizmovac, Inc](https://appshunter.io/developer/1441824326) |

## What reviewers say

### UNITS MASTER

[App page](https://appshunter.io/ios/app/units-master/id1428926317)

This app is a comprehensive unit conversion calculator for length, distance, and area. It supports a vast array of US and metric units, offering both fractional and decimal calculations with customizable rounding. Users can also perform complex mathematical operations and access a calculation history.

**Highlights:** Extensive US and metric unit support, Fractional and decimal calculations, Customizable rounding precision, Complex calculation capabilities, Calculation history and sharing, Multiple output formats

**Features:** Vision Pro support

**In-app purchases:** none


### Scale

[App page](https://appshunter.io/ios/app/scale-o-tron/id1441824327)

This tool simplifies scaling and unit conversions for creators. It offers a vast library of scales and units, allowing for seamless adjustments and precise calculations. Customize the interface to match your workflow and focus on your projects.

**Highlights:** Extensive database of scales and units, Customizable scales and units, Imperial and metric conversions, Fractional and decimal rounding, Conversion history, Customizable buttons

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is UNITS MASTER free?

UNITS MASTER costs $6.99, with no in-app purchases.

### Is Scale free?

Scale costs $2.99, with no in-app purchases.

### Which has better reviews, UNITS MASTER or Scale?

Scale is rated higher. UNITS MASTER averages 4.3 out of 5 from 6 ratings, while Scale averages 5.0 from 4 ratings.

### Do UNITS MASTER or Scale have ads?

Neither UNITS MASTER nor Scale shows ads.

### Which is updated more often, UNITS MASTER or Scale?

UNITS MASTER ships an update every 4 months, and Scale every 8 days. Most recently, UNITS MASTER was updated on September 10, 2026 and Scale on June 1, 2026.

---

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