# Ruler with Caliper, Protractor vs OneKit

The clearest difference is ads: OneKit at none against Ruler with Caliper, Protractor's shown. OneKit also leads on update cadence (every 3 weeks vs every 28 months). Ruler with Caliper, Protractor's advantage is iOS requirement (16.0 vs 18.6). On price, in-app purchases and device support 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 and OneKit sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Ruler with Caliper, Protractor ships an update every 28 months, OneKit every 3 weeks. The most recent releases landed on October 5, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Ruler with Caliper, Protractor | OneKit |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 28 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 5 MB |
| Requires iOS | **16.0** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bhavinkumar Satashiya](https://appshunter.io/developer/1361485921) | [Olekcii Ponomarenko](https://appshunter.io/developer/1577090637) |

## 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 |


### OneKit

[App page](https://appshunter.io/ios/app/onekit-smart-digital-toolbox/id6757952765)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly subscription | $2.99 | per 7 days |
| Monthly subscription | $9.99 | per month |
| Yearly subscription | $49.99 | per year |


## Frequently asked questions

### Is Ruler with Caliper, Protractor free?

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

### Is OneKit free?

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

### Do Ruler with Caliper, Protractor or OneKit have ads?

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

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

Ruler with Caliper, Protractor ships an update every 28 months, and OneKit every 3 weeks. Most recently, Ruler with Caliper, Protractor was updated on October 5, 2026 and OneKit on October 13, 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.*