# Millimeter Pro - screen ruler

> best tape measure in inch mm

Canonical page: [https://chrome-stats.com/d/id631810777](https://chrome-stats.com/d/id631810777)

## Overview

- **ID:** `id631810777`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** VisTech.Projects LLC
- **Category:** Utilities
- **Rating:** 4.40 / 5 (108 ratings)
- **Version:** 2.0.16
- **Last updated:** 2024-09-27
- **First published:** 2013-04-11
- **Size:** 24 MB
- **Data as of:** 2026-09-08
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/millimeter-pro-screen-ruler/id631810777)
- **Website:** [http://vistechprojects.blogspot.com/search/label/Millimeter](http://vistechprojects.blogspot.com/search/label/Millimeter)
- **Privacy policy:** [https://www.vistechprojects.com/privacy-policy](https://www.vistechprojects.com/privacy-policy)

## Description

Millimeter Pro is an easy-to-use measurement tool for iPhone and iPad that turns your screen into a versatile ruler. It supports millimeters and inches, 2D vertical and horizontal rulers, area calculations, and length, angle, and ratio (W/H) measurements.

It also includes circle radius estimation, diameter calculation, Protractor/Goniometer mode, and a thread pitch gauge for TPI and pitch size. Use it for small objects like jewelry, screws, beads, stones, and other tiny items, with a touch-screen lock to freeze measurements.

## Rankings

- #133,814 — Overall

## Review summary

Summary: Users find Millimeter Pro useful for quick, on-the-fly measurements of small items and for diameter-based sizing, with a simple, intuitive interface. However, many reviews flag recurring calibration and accuracy issues, device-dependent scaling (notably between iPhone and iPad), and a subpar UI that makes precise adjustment tedious. Some functionality is limited (not ideal for angles), and the app can be inconsistent across updates and devices. Overall, it's handy for quick checks but unreliable for precise, cross-device measurements.

### Pros

- Easy to use and intuitive interface.
- Great for measuring small items and for quick, on-the-fly measurements.
- Diameter ruler feature helps visualize mm/inches, useful for jewelry and similar sizing.
- Visual, ruler-like feedback makes size estimation straightforward.
- Simple, fast tool that turns your phone into a measuring device.

### Cons

- Calibration/accuracy issues across devices and after updates, with measurements drifting or being off.
- Clunky UI for precise adjustments (needs typing exact numbers; dragging is limited; lock/orientation confusing).
- Device compatibility and scaling problems (iPad vs iPhone differences; sizing varies by device and after OS updates).
- Limited functionality (not suitable for angle calculations; best for simple shapes; excessive digits can hinder readability).

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Source: [Chrome-Stats](https://chrome-stats.com/d/id631810777)