# Millimeter Pro vs Site Checker

The clearest difference is rating: Millimeter Pro at 4.4 against Site Checker's 3.4. Millimeter Pro also leads on chart position (#186 vs unranked) and ratings volume (109 vs 12). Site Checker's advantage is update cadence (every 3 weeks vs every 4 months) and price ($1.90 vs $3.99). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Millimeter Pro costs $3.99 and Site Checker $1.90 up front. Neither carries in-app purchases, so what you see is what you pay.

Millimeter Pro holds the better App Store score, 4.4 against 3.4. That said, the two scores are not equally well evidenced: Millimeter Pro has 109 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 58% of Millimeter Pro's written reviews are positive against 50% of Site Checker's.

Millimeter Pro ships an update every 4 months, Site Checker every 3 weeks. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Millimeter Pro | Site Checker |
| --- | --- | --- |
| Price | $3.99 | **$1.90** |
| Rating | **[4.4 (109 ratings)](https://appshunter.io/ios/app/millimeter-pro-screen-ruler/id631810777/reviews)** | [3.4 (12 ratings)](https://appshunter.io/ios/app/site-checker-down-detector/id1630945886/reviews) |
| Number of ratings | **109** | 12 |
| Positive reviews | **57.9% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | **Free** | Paid |
| Best chart rank | **#186** | — |
| Size | 24 MB | 8 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [VisTech.Projects LLC](https://appshunter.io/developer/620969851) | [Tamara Dudarenko](https://appshunter.io/developer/1602845370) |

## What reviewers say

### Millimeter Pro

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

**Currently charting:** #186 Top Paid · Utilities (US App Store)

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


### Site Checker

[App page](https://appshunter.io/ios/app/site-checker-down-detector/id1630945886)

This app provides web tool utilities to monitor network connection stability and website availability. It includes HTTP tests for API checks and a downtime detector to verify site access globally. Useful for system administrators and web developers to troubleshoot DNS and ISP connection issues.

**Highlights:** WiFi and mobile data connection monitoring, HTTP test for REST API checks, Downtime detector for site access, Works on 3G/4G/5G/LTE and WiFi, Supports VPN and proxy servers, Troubleshoots DNS and ISP connection issues

**In-app purchases:** none


## Frequently asked questions

### Is Millimeter Pro free?

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

### Is Site Checker free?

Site Checker costs $1.90, with no in-app purchases.

### Which has better reviews, Millimeter Pro or Site Checker?

Millimeter Pro is rated higher. Millimeter Pro averages 4.4 out of 5 from 109 ratings, while Site Checker averages 3.4 from 12 ratings.

### Do Millimeter Pro or Site Checker have ads?

Neither Millimeter Pro nor Site Checker shows ads.

### Which is updated more often, Millimeter Pro or Site Checker?

Millimeter Pro ships an update every 4 months, and Site Checker every 3 weeks. Most recently, Millimeter Pro was updated on October 24, 2026 and Site Checker on October 27, 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.*