# Ruler Professional — user reviews

> 14 indexed App Store user reviews of Ruler Professional by KBIC International Ltd, rated 3.30/5 from 3 ratings.

- Source: https://appshunter.io/ios/app/ruler-professional/id527471088/reviews
- App overview in markdown: https://appshunter.io/ios/app/ruler-professional/id527471088.md
- Rating breakdown: 5★ 1 · 4★ 1 · 3★ 0 · 2★ 0 · 1★ 1

## Most critical reviews (10 lowest-rated)

### 1/5 — Grossly inaccurate

*2020-02-16*

It’s not even funny how horribly inaccurate that this ruler is on my iPhone XR.

### 1/5 — I got the app but didnt go on it

*2017-06-04, version 1.8*

I am lazy so bye

### 1/5 — Waaaaay off

*2015-03-13*

Downloaded to an iPad mini and the scale is ridiculously off.

### 1/5 — Inaccurate measurements for 6 plus

*2015-03-05, version 1.7*

One inch is actually about 1 1/8 inch on the iPhone 6  plus. I could not find a way to calibrate the app.

### 1/5 — Don't waste your time.

*2012-05-28*

This app is so stupid. I deleted it a few minutes after downloading it. What a waste of freakin' time. LAME!

### 2/5 — Not retina

*2013-03-22, version 1.3*

Text and lines are fuzzy.

### 4/5 — Recalibrate and get the 5th Star!!

*2019-02-19, version 1.9*

I also found that on iPhone 7P the ruler pro app measures 1” as 1,1/8”. Is there a way to recalibrate for correction? Otherwise I like the ruler with adjustable redlined so that you can use it like callipers and set small items right on the screen between redlines for accuracy & precision.

### 4/5 — In case you’re wondering...

*2017-10-26*

There are no instructions, so finding out how to switch from inches to centimeters may be difficult. The i with a circle around it is the key. But it’s so close to the ad at the bottom of the screen, it took me a bit to realize it’s not a link to give me more information about the ad. The ruler is nice and simple other than that. It’d definitely be nice to have a simple tutorial opening page to explain the options available. The red lines need an explanation (though they can be self-explanatory). Not everything is obvious to everyone.

### 5/5 — iPad retina

*2014-08-05*

Just downloaded this and checked the calibration against my ruler. It's spot on. Measures in inches and centimetres and their increments. 5⭐️!

### 5/5 — Easy to use

*2013-07-13*

Simple, clean design, and easy to use

## Most praised reviews (4 highest-rated)

### 5/5 — It's a ruler

*2013-01-15, version 1.3*

It works. It's a ruler.

### 5/5 — Exactly what it says it is.

*2013-01-11*

It's actually pretty cool. That u can move your zero point. Great free app. And it works on my iPad mini!

### 5/5 — Perfect measurements!

*2012-11-10, version 1.2*

Not optimized for the iPhone 5 but works fantastic. Gives accurate measurements.

### 5/5 — A ruler in your pocket

*2012-09-27*

Without carrying a real ruler, you can use this app to measure lengths of little things with high accuracy. Think cards, thickness of furniture, gaps, small gifts, etc. It's a neat idea!

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-02.*