# Length vs Millimeter Pro

The clearest difference is update cadence: Millimeter Pro at every 4 months against Length's every 11 months. Length's advantage is price ($0.99 vs $3.99) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Length costs $0.99 and Millimeter Pro $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Length ships an update every 11 months, Millimeter Pro every 4 months. The most recent releases landed on October 18, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Length | Millimeter Pro |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| 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 11 months | **Every 4 months** |
| Monetization | — | Free |
| Size | 34 MB | 24 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Piet Jonas](https://appshunter.io/developer/288060167) | [VisTech.Projects LLC](https://appshunter.io/developer/620969851) |

## What reviewers say

### Length

[App page](https://appshunter.io/ios/app/length/id512188088)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Length free?

Length costs $0.99, with no in-app purchases.

### Is Millimeter Pro free?

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

### Do Length or Millimeter Pro have ads?

Neither Length nor Millimeter Pro shows ads.

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

Length ships an update every 11 months, and Millimeter Pro every 4 months. Most recently, Length was updated on October 18, 2026 and Millimeter Pro on October 20, 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.*