# Caliper&Ruler vs Rusty.

The clearest difference is iOS requirement: Caliper&Ruler at 18.4 against Rusty.'s 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Caliper&Ruler sells 1 one-off in-app purchase and Rusty. sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Caliper&Ruler | Rusty. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/caliper-and-ruler/id6749051381/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 1 MB |
| Requires iOS | **18.4** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [Jun Yamabe](https://appshunter.io/developer/1732682049) | [Dario Gartmann](https://appshunter.io/developer/1865263482) |

## What reviewers say

### Caliper&Ruler

[App page](https://appshunter.io/ios/app/caliper-and-ruler/id6749051381)

Transform your device into a precise digital caliper for measuring objects in inches and millimeters. Features intuitive drag-and-measure functionality and accurate screen calibration using common items.

**Highlights:** Dual measurement units (inches/millimeters), Intuitive drag-and-measure interface, Accurate screen calibration, Custom calibration options, Universal device compatibility

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### Rusty.

[App page](https://appshunter.io/ios/app/rusty/id6762121969)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rusty. Premium | $2.99 | one-time |


## Frequently asked questions

### Is Caliper&Ruler free?

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

### Is Rusty. free?

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

### Do Caliper&Ruler or Rusty. have ads?

Neither Caliper&Ruler nor Rusty. shows ads.

### Which is updated more often, Caliper&Ruler or Rusty.?

Caliper&Ruler ships an update every 6 weeks, and Rusty. every 6 weeks. Most recently, Caliper&Ruler was updated on October 30, 2026 and Rusty. on October 25, 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.*