# Convert vs Scale Ratio

The clearest difference is rating: Convert at 5.0 against Scale Ratio's 3.7. Convert also leads on monetization model (free vs free with in-app purchases) and iOS requirement (8.0 vs 10.0). Scale Ratio's advantage is review sentiment (83% vs 60%) and update cadence (fortnightly vs every 5 weeks). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Convert sells 2 one-off in-app purchases and Scale Ratio sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Convert holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews complicate that: 60% of Convert'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.

Convert ships an update every 5 weeks, Scale Ratio fortnightly. The most recent releases landed on September 10, 2026 and August 14, 2026 respectively.

## The numbers

| Metric | Convert | Scale Ratio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/convert-units-converter/id433833965/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/scale-ratio/id1448744741/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 60.0% of reviews | **83.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 14 MB | 25 MB |
| Requires iOS | **8.0** | 10.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Toutdanslapoche](https://appshunter.io/developer/432521152) | [Adrien Brecheteau](https://appshunter.io/developer/956859837) |

## What reviewers say

### Convert

[App page](https://appshunter.io/ios/app/convert-units-converter/id433833965)

Perform common conversions for length, area, volume, angle, and scales with a modern, efficient interface. Save your preferences and access a history of calculations for quick retrieval. Customize the app's appearance to suit your style.

**Highlights:** Common unit conversions, Custom scale conversions, Saved conversion preferences, Conversion history, Customizable interface colors, Supports luminance conversions

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $0.99 | one-time |
| Premium Version | $0.99 | one-time |


### 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 Convert free?

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

### Is Scale Ratio free?

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

### Which has better reviews, Convert or Scale Ratio?

Convert is rated higher. Convert averages 5.0 out of 5 from 1 ratings, while Scale Ratio averages 3.7 from 3 ratings.

### Do Convert or Scale Ratio have ads?

Neither Convert nor Scale Ratio shows ads.

### Which is updated more often, Convert or Scale Ratio?

Convert ships an update every 5 weeks, and Scale Ratio fortnightly. Most recently, Convert was updated on September 10, 2026 and Scale Ratio on August 14, 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.*