# Scales HD vs Scale Ratio

The clearest difference is price: Scale Ratio at Free against Scales HD's $3.99. Scale Ratio also leads on review sentiment (83% vs 50%) and update cadence (fortnightly vs every 95 months). Scales HD's advantage is rating (4.2 vs 3.7) and in-app purchases (none vs 1). On ratings volume, ads and device support there is nothing between them.

Scale Ratio is free to download; Scales HD costs $3.99 up front. Scale Ratio sells 1 one-off in-app purchase. Scales HD asks for nothing beyond the download.

Scales HD holds the better App Store score, 4.2 against 3.7. Both are backed by a comparable volume of ratings — 5 and 3 respectively. Written reviews complicate that: 50% of Scales HD's written reviews are positive against 83% of Scale Ratio's, so the app with the better star average is not the one people write more warmly about.

Scales HD ships an update every 95 months, Scale Ratio fortnightly. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Scales HD | Scale Ratio |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/scales-hd/id418843481/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/scale-ratio/id1448744741/reviews) |
| Number of ratings | **5** | 3 |
| Positive reviews | 50.0% of reviews | **83.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 95 months | **Fortnightly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 7 MB | 25 MB |
| Requires iOS | 15.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Marcelo Mejia Cobo](https://appshunter.io/developer/365496933) | [Adrien Brecheteau](https://appshunter.io/developer/956859837) |

## What reviewers say

### Scales HD

[App page](https://appshunter.io/ios/app/scales-hd/id418843481)

This app provides a digital architectural and engineering scale ruler with various US and Metric scales. It includes tools like a tape measure and spirit level, with options to flip scales and lock scrolling. Control your music library directly from the app.

**Highlights:** Architectural US Scales, Engineering US Scales, Metric SI Scales, Tape Measure Tool, Spirit Level Tool, Flip Scales Option, Music Control

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

**In-app purchases:** none


### Scale Ratio

[App page](https://appshunter.io/ios/app/scale-ratio/id1448744741)

Easily convert distances between any scales for projects like architecture and model building. Input your measurements and desired scale to instantly calculate scaled distances.

**Highlights:** Convert distances between any scales, Supports architecture and modeling projects, Instant calculation of scaled distances, User-friendly input for distance and scale

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Delete Ads in the app | $4.99 | one-time |


## Frequently asked questions

### Is Scales HD free?

Scales HD costs $3.99, with no in-app purchases.

### Is Scale Ratio free?

Scale Ratio is free to download, with in-app purchases available.

### Which has better reviews, Scales HD or Scale Ratio?

Scales HD is rated higher. Scales HD averages 4.2 out of 5 from 5 ratings, while Scale Ratio averages 3.7 from 3 ratings.

### Do Scales HD or Scale Ratio have ads?

Neither Scales HD nor Scale Ratio shows ads.

### Which is updated more often, Scales HD or Scale Ratio?

Scales HD ships an update every 95 months, and Scale Ratio fortnightly. Most recently, Scales HD was updated on November 1, 2026 and Scale Ratio on November 2, 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.*