# Ruler with Caliper, Protractor vs Ring Sizer

The clearest difference is in-app purchases: Ring Sizer at none against Ruler with Caliper, Protractor's 3. Ring Sizer also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 28 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Ruler with Caliper, Protractor sells 3 in-app purchases, starting at $3.99 per 7 days. Ring Sizer asks for nothing beyond the download.

Ruler with Caliper, Protractor ships an update every 28 months, Ring Sizer every 2 weeks. The most recent releases landed on October 22, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Ruler with Caliper, Protractor | Ring Sizer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 28 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 49 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bhavinkumar Satashiya](https://appshunter.io/developer/1361485921) | [Yaroslav Trofimov](https://appshunter.io/developer/1851395994) |

## What reviewers say

### 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 |


### Ring Sizer

[App page](https://appshunter.io/ios/app/ring-sizer-measure-ruler/id6793472743)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ruler with Caliper, Protractor free?

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

### Is Ring Sizer free?

Ring Sizer is free to download, with no in-app purchases.

### Do Ruler with Caliper, Protractor or Ring Sizer have ads?

Ruler with Caliper, Protractor shows ads; Ring Sizer does not.

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

Ruler with Caliper, Protractor ships an update every 28 months, and Ring Sizer every 2 weeks. Most recently, Ruler with Caliper, Protractor was updated on October 22, 2026 and Ring Sizer on October 7, 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.*