# Millimeter Pro vs Viaskin

The clearest difference is price: Viaskin at Free against Millimeter Pro's $3.99. Millimeter Pro's advantage is update cadence (every 4 months vs every 23 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Viaskin is free to download; Millimeter Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Millimeter Pro ships an update every 4 months, Viaskin every 23 months. The most recent releases landed on October 20, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Millimeter Pro | Viaskin |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.4 (109 ratings)](https://appshunter.io/ios/app/millimeter-pro-screen-ruler/id631810777/reviews)** | — |
| Number of ratings | **109** | — |
| Positive reviews | 57.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 23 months |
| Monetization | Free | — |
| Size | 24 MB | 98 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VisTech.Projects LLC](https://appshunter.io/developer/620969851) | [坤 杨](https://appshunter.io/developer/1590949449) |

## What reviewers say

### Millimeter Pro

[App page](https://appshunter.io/ios/app/millimeter-pro-screen-ruler/id631810777)

This app transforms your device into a versatile measuring tool. It allows for precise measurements of length, area, diameter, and angles using the touchscreen. Easily split objects into equal parts and switch between millimeters and inches for your convenience.

**Highlights:** Touchscreen ruler and tape measure, Measure length, area, diameter, and angles, Split objects into equal parts, Supports millimeters and inches, Estimate radius, Thread pitch gauge

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

**In-app purchases:** none


### Viaskin

[App page](https://appshunter.io/ios/app/viaskin/id1631936764)

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

**In-app purchases:** none


## Frequently asked questions

### Is Millimeter Pro free?

Millimeter Pro costs $3.99, with no in-app purchases.

### Is Viaskin free?

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

### Do Millimeter Pro or Viaskin have ads?

Neither Millimeter Pro nor Viaskin shows ads.

### Which is updated more often, Millimeter Pro or Viaskin?

Millimeter Pro ships an update every 4 months, and Viaskin every 23 months. Most recently, Millimeter Pro was updated on October 20, 2026 and Viaskin on October 8, 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.*