# Length vs Ruler with Caliper, Protractor

The clearest difference is price: Ruler with Caliper, Protractor at Free against Length's $0.99. Length's advantage is in-app purchases (none vs 3) and ads (none vs shown). On device support there is nothing between them.

Ruler with Caliper, Protractor is free to download; Length costs $0.99 up front. Ruler with Caliper, Protractor sells 3 in-app purchases, starting at $3.99 per 7 days. Length asks for nothing beyond the download.

Length ships an update every 11 months, Ruler with Caliper, Protractor every 28 months. The most recent releases landed on October 18, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Length | Ruler with Caliper, Protractor |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 11 months** | Every 28 months |
| Monetization | — | Free with in-app purchases |
| Size | 34 MB | 6 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Piet Jonas](https://appshunter.io/developer/288060167) | [Bhavinkumar Satashiya](https://appshunter.io/developer/1361485921) |

## What reviewers say

### Length

[App page](https://appshunter.io/ios/app/length/id512188088)

**Features:** macOS Compatibility

**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 Length free?

Length costs $0.99, 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 Length or Ruler with Caliper, Protractor have ads?

Ruler with Caliper, Protractor shows ads; Length does not.

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

Length ships an update every 11 months, and Ruler with Caliper, Protractor every 28 months. Most recently, Length was updated on October 18, 2026 and Ruler with Caliper, Protractor on October 22, 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.*