Best Ruler Image Apps

235+ iOS apps curated and reviewed

3.5 avg rating

20 free apps

Updated August 2026

Out of 235+ ruler image 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 Ruler Image Apps (August 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	Image Ruler - Measures	Free	1.5★ (44)	No	No	Aug 2026
2	Ruler®	Free	4.3★ (35K)	No	Yes	Sep 2026
3	BPaaS Image Ruler	Free	—	No	No	May 2026
4	Super Ruler	Free	—	Yes	No	May 2026
5	Ruler - measuring scale	Free	4.3★ (133)	Yes	Yes	Aug 2026
6	Epic Ruler	Free	1.0★ (4)	No	No	Aug 2026
7	Screen Ruler: Measure Length	Free	3.6★ (23)	Yes	Yes	Aug 2026
8	Ruler •	Free	4.2★ (405)	Yes	No	Sep 2026

Top Picks for Ruler Image

#1

Image Ruler - Measures by Martin Schurmann

Camera Photo Measur Tape

Editor's Choice

📊 Productivity

1.5(44 ratings)

FreeIn-App Purchases

Image Ruler - Measures screenshot 1

Image Ruler - Measures screenshot 2

Image Ruler - Measures screenshot 3

Image Ruler - Measures screenshot 4

This app allows you to measure objects directly on photos. Simply take a picture, mark a known object for reference, and then draw measurements on other items within the same image. It supports both metric and imperial units and offers intuitive editing tools.

#2

Ruler® by Tue Nguyen Minh

+ Photo Ruler & AR Measure

Strong Contender

🔧 Utilities

4.3😞(35K ratings)

FreeIn-App Purchases

Ruler® screenshot 1

Ruler® screenshot 2

Ruler® screenshot 3

Ruler® screenshot 4

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.

What We Love

🚀 Accurate measurements
👍 Easy to use
🔍 Convenient for small items
📏 Useful ruler tool

Room to Improve

💰 Paywall for basic features
⏱️ Limited free usage time
🔍 Inaccurate for larger objects
🙅‍♀️ Aggressive monetization tactics

#3

BPaaS Image Ruler by Jose A Perez

Measure your Images!

Worth Considering

🔧 Utilities

0.0(0 ratings)

Free

BPaaS Image Ruler screenshot 1

BPaaS Image Ruler screenshot 2

BPaaS Image Ruler screenshot 3

More Ruler Image apps to explore

Super Smart Ruler

Ruler - measuring scale

Ruler - measuring scale

Ruler - measuring scale

Measure with your phone

This utility app uses augmented reality to measure the length and area of real-world objects using your smartphone's camera. It offers unlimited measurements and an ad-free experience with premium subscriptions.

Augmented reality measurementMeasure length and areaHigh precision with AR Kit

free with in-app purchases

A classic ruler

Transform your smartphone into a portable measuring tool. Accurately measure lengths in both inches and centimeters directly from your device.

Converts phone to rulerMeasures in inchesMeasures in centimeters

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

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

Ruler 2.0 - inch, mm, cm

Ruler 2.0 - inch, mm, cm

Ruler 2.0 - inch, mm, cm

High measurement accuracy

This app provides a precise on-screen measuring tool for your iPhone or iPad. Easily measure length and width in centimeters, millimeters, or inches, with options to save measurements as photos and customize the ruler's appearance. It's designed for accurate, user-friendly measurements.

On-screen rulerMeasure length and widthCentimeters, millimeters, inches

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

Ruler - CM, MM, Inches

Ruler - CM, MM, Inches

Ruler - CM, MM, Inches

CM, MM, In. Measure Anything.

Measure lengths, widths, and diagonals accurately using your phone. Switch between metric and imperial units, and utilize flexible starting points for precise measurements in any direction. Features auto-calibration for minimal error and a screen lock to preserve readings.

Multi-mode measurement (CM, MM, Inches, Fractions)Flexible starting pointsFull-direction measurement (horizontal, vertical, diagonal)

free with in-app purchases

Ruler - Digital Meter Scale

Ruler - Digital Meter Scale

Ruler - Digital Meter Scale

Transform your iPhone into a handy measuring tool. Accurately measure lengths in centimeters and inches, up to 1 meter, without needing a physical ruler.

Use iPhone as a rulerMeasure in centimetersMeasure in inches

Measuring Tape, Photo Ruler

Measuring Tape, Photo Ruler

Measuring Tape, Photo Ruler

Meter: measure length, height

This app offers precise measurements using augmented reality and on-screen tools. It caters to both professional and everyday needs with features like a flexible measuring tape, bubble level, and photo ruler. Save and manage your measurements within projects for easy access.

Augmented reality measurementsOn-screen ruler (1D/2D)Photo ruler for object measurement

📊 Productivity

Ruler - Scale Ruler

Ruler - Scale Ruler

Ruler - Scale Ruler

Various scales can be set!

This app displays various measurement scales for length, including meters and inches. It allows users to set magnification ratios and reduced scales for different applications. Users can calibrate the ruler and adjust PPI settings for accurate measurements.

Display various measurement scalesSet magnification ratiosSet reduced scales

📊 Productivity

free with in-app purchases

MarkX Image Meter Markup Ruler

MarkX Image Meter Markup Ruler

MarkX Image Meter Markup Ruler

Annotate, Draw & Label Photos

This tool allows professionals to add precise markings, measurements, and annotations to images. It supports various drawing tools, units, and layer management for detailed visual documentation and communication.

Line segment annotation with length displayRectangle, circle, and arrow pointersAngle and freehand measurement

🎨 Graphics & Design

Ruler - Screen accurate ruler

Ruler - Screen accurate ruler

Ruler - Screen accurate ruler

measuring app and ruler app

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.

Instant touch measurementTwo-finger measurementReal-time results (cm/inches)

Measure lengths

This app allows you to measure lengths accurately in both inches and centimeters. It provides a simple and straightforward tool for quick measurements.

Measure in inchesMeasure in centimetersAccurate length measurement

📊 Productivity

free with in-app purchases

Ruler & Tape Measure – AR Tool

Ruler & Tape Measure – AR Tool

Ruler & Tape Measure – AR Tool

Length, Width, Height & Angle

Fast, Handy Measuring Tool

$0.99 | 100% OFF

Quick Measure - Precise Ruler

Quick Measure - Precise Ruler

Quick Measure - Precise Ruler

AR Measurement & Smart Tape

This utility app provides a digital and augmented reality ruler for precise measurements. It includes features like unit conversion, a built-in level, and the ability to record and store measurement data.

Digital ruler for precise length measurementsAR ruler for measuring distances in real-world environmentsMeasurement recording and storage

FAQ about Ruler Image

What are the best ruler image apps for iPhone?

Image Ruler - Measures tops our ruler image apps ranking as of August 2026, with a 1.5-star average from 44 App Store ratings, and it's free to download.

Are there free ruler image apps for iPhone?

Yes — 20 of the top ruler image apps we rank are free to download, including Image Ruler - Measures and Ruler®.

Does Image Ruler - Measures have ads or in-app purchases?

Image Ruler - Measures has no ads and has no in-app purchases, according to its App Store listing as of August 2026.

How many ruler image apps are on the App Store?

We track 235+ ruler image apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.

How accurate are the measurements taken with Image Ruler?

Measurements taken with Image Ruler are estimates. The app's accuracy depends on factors like ensuring the object of known length and the object to be measured are in the same plane and the camera is parallel to them to avoid distortion.

What devices is Image Ruler compatible with?

Image Ruler is supported on iPhone, iPad, and iPod devices. It is designed to work across Apple's mobile ecosystem.