Best On Screen Ruler Apps

244+ iOS apps curated and reviewed

3.7 avg rating

20 free apps

Updated September 2026

Out of 244+ on screen ruler apps on iOS, 20 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top On Screen Ruler Apps (September 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	Rul3r	Free	4.5★ (1K)	Yes	Yes	Sep 2026
2	ScreenRuler - Measure Length	Free	—	No	No	Aug 2026
3	Ruler - Screen accurate ruler	Free	—	No	No	May 2026
4	Ruler®	Free	4.3★ (35K)	No	Yes	Sep 2026
5	Ruler, Measuring Tape - AR App	Free	4.3★ (1K)	Yes	Yes	Sep 2026
6	Ruler •	Free	4.2★ (405)	Yes	No	Sep 2026
7	RulerApp	Free	—	—	No	Sep 2026
8	Ruler: On Screen Tape Measure	Free	—	No	Yes	Sep 2026

Top Picks for On Screen Ruler

#1

Rul3r by YOYASOFT LLC

Ruler, Altimeter and More

Editor's Choice

🔧 Utilities

4.5(1K ratings)

FreeAdsIn-App Purchases

Rul3r screenshot 1

Rul3r screenshot 2

Rul3r screenshot 3

Rul3r screenshot 4

Rul3r screenshot 5

Rul3r screenshot 6

This utility app provides a portable ruler for on-the-go measurements. It also includes a suite of additional tools like a protractor, spirit level, and various meters for diverse measurement needs.

#2

ScreenRuler - Measure Length by pilyeong heo

Real cm & inch ruler on screen

Strong Contender

🔧 Utilities

0.0(0 ratings)

Free

ScreenRuler - Measure Length screenshot 1

ScreenRuler - Measure Length screenshot 2

ScreenRuler - Measure Length screenshot 3

#3

Ruler - Screen accurate ruler by Ethan Dietrich

measuring app and ruler app

Worth Considering

🔧 Utilities

0.0(0 ratings)

Free

Ruler - Screen accurate ruler screenshot 1

Ruler - Screen accurate ruler screenshot 2

Ruler - Screen accurate ruler screenshot 3

Ruler - Screen accurate ruler screenshot 4

Transform your device into a precise measuring tool. Measure objects, distances, and spaces with fingertip accuracy. Offers real-time results in both metric and imperial units, with professional calibration for your specific device.

More On Screen Ruler apps to explore

+ Photo Ruler & AR Measure

This app provides a versatile toolkit for all your measurement needs. It includes a classic ruler, a tape measure, and a camera ruler for precise measurements. Easily switch between units and document your findings by adding measurements directly to photos.

Classic ruler and tape measureCamera ruler modePhoto measures mode

free with in-app purchases

Ruler, Measuring Tape - AR App

Ruler, Measuring Tape - AR App

Ruler, Measuring Tape - AR App

Length Measure Calculator Tool

This app turns your device into a versatile ruler and tape measure using advanced AR technology. It offers precise measurements for objects, rooms, and complex shapes, along with unit conversion and a history log. Ideal for professionals and everyday users needing accurate measurements.

AR ruler and tape measureLength and distance measurementUnit converter (mm, inches, cm)

free with in-app purchases

Includes Camera (AR) Ruler

Measure objects and distances with an on-screen ruler and augmented reality. Supports inches and centimeters, with features for linear sizes, angles, area, volume, and more. Save your measurements for later use.

On-screen ruler for small objectsAugmented Reality (AR) measuringMeasure linear sizes in cm/inches

by Mathieu Rancourt

Ruler: On Screen Tape Measure

Ruler: On Screen Tape Measure

Ruler: On Screen Tape Measure

Protractor, Level, Converter

This app transforms your phone into a precise measuring tool. Calibrate it once with a common object to accurately measure small items, angles, and levels. It also includes a unit converter and a tape canvas for larger measurements.

Calibrated on-screen rulerProtractor with set squareBubble level

free with in-app purchases

Fast, Handy Measuring Tool

$0.99 | 100% OFF

Super Smart Ruler

Cetvel ölçü aleti

Pocket Ruler - Gauge on Screen

Pocket Ruler - Gauge on Screen

Pocket Ruler - Gauge on Screen

Measure on Screen

Measure objects directly on your iPhone screen without a physical ruler. Offers two intuitive modes for precise readings and supports both millimeters and inches for global use.

Measure objects on screenTwo measurement modesAdjustable reference points

free with in-app purchases

Tape Measure & Ruler Арр

Tape Measure & Ruler Арр

Tape Measure & Ruler Арр

Multifunctional Ruler・Level

This app functions as a digital measuring tool, allowing you to measure objects and distances with accuracy. It also enables you to create sketches with text annotations and share your measurements and designs.

Digital ruler and measuring tapeImperial and Metric unitsRangefinder for distance measurement

free with in-app purchases

Screen Ruler: Measure Length

Screen Ruler: Measure Length

Screen Ruler: Measure Length

CM, MM & Inch Measuring Tool

Turn your iPhone or iPad into a precise measuring tool. Easily measure lengths in centimeters or inches with features like magnifier mode and haptic feedback. Ideal for daily tasks, office use, DIY projects, and on-the-go measurements.

Dual units (cm/inches)Precision calibrationMagnifier mode

free with in-app purchases

Inch Ruler device size measure

Inch Ruler device size measure

Inch Ruler device size measure

your device as Ruler, measure.

Ruler / Measuring Tape

Ruler / Measuring Tape

Ruler / Measuring Tape

Measure on screen, AR & paper

Measure objects using your device's screen, augmented reality, or by printing a ruler. Offers three distinct methods for on-demand measurement without physical tools.

Measure against screenAugmented reality measurementPrintable ruler via AirPrint

Life-Size Ruler

Life-Size Ruler

Life-Size Ruler

Smartphone as a Ruler

Transform your smartphone into a precise measuring tool. This utility app allows you to measure lengths and distances directly on your device's screen. Ideal for quick estimations and practical applications.

Smartphone as a rulerMeasure lengthsMeasure distances

free with in-app purchases

Ruler - Screen Measure Tool

Ruler - Screen Measure Tool

Ruler - Screen Measure Tool

Measure anything

Ruler - Accurate Ruler

Ruler - Accurate Ruler

Ruler - Accurate Ruler

This application provides a precise measurement tool by rendering according to your device's screen width specifications. It has been tested on a wide range of Apple devices to ensure accuracy for your measuring needs.

Accurate screen-based renderingDevice-specific calibrationWide device compatibility

📊 Productivity

Digital Ruler - Pocket Measure

Digital Ruler - Pocket Measure

Digital Ruler - Pocket Measure

by Nguyen Nam Giang

$0.99 | 100% OFF

Measure small objects directly on your device's screen. Adjust the on-screen area to match the item's dimensions and get precise width, height, and diagonal measurements in centimeters or inches.

Measure width, height, and diagonalSupports centimeters and inchesAdjustable on-screen measurement area

📊 Productivity

FAQ about On Screen Ruler

What are the best on screen ruler apps for iPhone?

Rul3r tops our on screen ruler apps ranking as of September 2026, with a 4.5-star average from 1K App Store ratings, and it's free to download.

Are there free on screen ruler apps for iPhone?

Yes — 20 of the top on screen ruler apps we rank are free to download, including Rul3r and ScreenRuler - Measure Length.

Does Rul3r have ads or in-app purchases?

Rul3r shows ads and offers in-app purchases, according to its App Store listing as of September 2026.

How many on screen ruler apps are on the App Store?

We track 244+ on screen ruler apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.

What does Rul3r do?

Rul3r is a utility app that provides a portable ruler on your phone for measuring lengths. It also offers a variety of other measurement and utility tools.

What are the key features of Rul3r?

Key features include a portable ruler, protractor, plumb line, spirit level, elevation and air pressure meter, decibel meter, and an ordinal date converter.

Related searches

on-screen ruler & tape measure