# Super Ruler vs Vernier Caliper Micrometer

The clearest difference is in-app purchases: Super Ruler at none against Vernier Caliper Micrometer's 1. Vernier Caliper Micrometer's advantage is ads (none vs shown) and update cadence (every 20 months vs every 109 months). On price and device support there is nothing between them.

Both are free to download. Vernier Caliper Micrometer sells 1 one-off in-app purchase. Super Ruler asks for nothing beyond the download.

Super Ruler ships an update every 109 months, Vernier Caliper Micrometer every 20 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Super Ruler | Vernier Caliper Micrometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.1 (22 ratings)](https://appshunter.io/ios/app/vernier-caliper-micrometer/id1242638955/reviews)** |
| Number of ratings | — | **22** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 109 months | **Every 20 months** |
| Monetization | — | Free with in-app purchases |
| Size | 8 MB | 24 MB |
| Requires iOS | 11.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hany Elmehy](https://appshunter.io/developer/959484887) | [齐 陈](https://appshunter.io/developer/455625305) |

## What reviewers say

### Super Ruler

[App page](https://appshunter.io/ios/app/super-ruler/id1182697242)

**Features:** macOS Compatibility

**In-app purchases:** none


### Vernier Caliper Micrometer

[App page](https://appshunter.io/ios/app/vernier-caliper-micrometer/id1242638955)

This utility app transforms your iPhone or iPad into a precise measuring tool for short lengths. It supports both inch and centimeter units, features calibration, and offers a user-friendly interface.

**Highlights:** Measures short lengths, Supports inches and centimeters, Unit switching, Calibration feature, Easy to use interface, Attractive UI

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is Super Ruler free?

Super Ruler is free to download, with no in-app purchases.

### Is Vernier Caliper Micrometer free?

Vernier Caliper Micrometer is free to download, with in-app purchases available.

### Do Super Ruler or Vernier Caliper Micrometer have ads?

Super Ruler shows ads; Vernier Caliper Micrometer does not.

### Which is updated more often, Super Ruler or Vernier Caliper Micrometer?

Super Ruler ships an update every 109 months, and Vernier Caliper Micrometer every 20 months. Most recently, Super Ruler was updated on November 6, 2026 and Vernier Caliper Micrometer 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.*