# Scales HD vs Ruler with Caliper, Protractor

The clearest difference is review sentiment: Scales HD at 50% against Ruler with Caliper, Protractor's 0%. Scales HD also leads on in-app purchases (none vs 3) and ads (none vs shown). Ruler with Caliper, Protractor's advantage is price (Free vs $3.99) and update cadence (every 28 months vs every 95 months). On device support and iOS requirement there is nothing between them.

Ruler with Caliper, Protractor is free to download; Scales HD costs $3.99 up front. Ruler with Caliper, Protractor sells 3 in-app purchases, starting at $3.99 per 7 days. Scales HD asks for nothing beyond the download.

Scales HD ships an update every 95 months, Ruler with Caliper, Protractor every 28 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Scales HD | Ruler with Caliper, Protractor |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/scales-hd/id418843481/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 95 months | **Every 28 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 7 MB | 6 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Marcelo Mejia Cobo](https://appshunter.io/developer/365496933) | [Bhavinkumar Satashiya](https://appshunter.io/developer/1361485921) |

## 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


### Ruler with Caliper, Protractor

[App page](https://appshunter.io/ios/app/ruler-with-caliper-protractor/id1368462815)

This app transforms your device into a precise digital measuring tool. It offers accurate measurements for various objects and distances using your camera, with multiple units and offline functionality.

**Highlights:** Accurate measurements via camera, Measure small objects to large distances, User-friendly interface, Multiple measurement units (inches, cm), Virtual ruler on screen, Save and share measurements, Offline accessibility

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $3.99 | per 7 days |
| Yearly | $39.99 | per year |
| Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is Scales HD free?

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

### Is Ruler with Caliper, Protractor free?

Ruler with Caliper, Protractor is free to download, with in-app purchases available.

### Do Scales HD or Ruler with Caliper, Protractor have ads?

Ruler with Caliper, Protractor shows ads; Scales HD does not.

### Which is updated more often, Scales HD or Ruler with Caliper, Protractor?

Scales HD ships an update every 95 months, and Ruler with Caliper, Protractor every 28 months. Most recently, Scales HD was updated on November 1, 2026 and Ruler with Caliper, Protractor 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.*