Best Ruler Image Apps

234+ iOS apps curated and reviewed

3.5 avg rating

20 free apps

Updated September 2026

Out of 234+ 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 (September 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	Ruler®	Free	4.3★ (35K)	No	Yes	Sep 2026
2	Image Ruler - Measures	Free	1.5★ (44)	No	No	Aug 2026
3	BPaaS Image Ruler	Free	—	No	No	May 2026
4	Super Ruler	Free	—	Yes	No	May 2026
5	Ruler 2.0 - inch, mm, cm	Free	3.9★ (205)	No	No	May 2026
6	Ruler - measuring scale	Free	4.3★ (133)	Yes	Yes	Aug 2026
7	Epic Ruler	Free	1.0★ (4)	No	No	Aug 2026
8	Screen Ruler: Measure Length	Free	3.7★ (24)	Yes	Yes	Sep 2026

Top Picks for Ruler Image

#1

Ruler® by Tue Nguyen Minh

+ Photo Ruler & AR Measure

Editor's Choice

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

#2

Image Ruler - Measures by Martin Schurmann

Camera Photo Measur Tape

Strong Contender

📊 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.

#3

BPaaS Image Ruler by Jose A Perez

Measure your Images!

Worth Considering

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 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 - 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

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

by Mathieu Rancourt

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

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 - 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 - 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)

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

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

Photo Ruler: Measure Objects

Photo Ruler: Measure Objects

Photo Ruler: Measure Objects

Measure Objects on Paper

Ruler & Tape Measure – AR Tool

Ruler & Tape Measure – AR Tool

Ruler & Tape Measure – AR Tool

Length, Width, Height & Angle

Photo Measure: Image Meter

Photo Measure: Image Meter

Photo Measure: Image Meter

Photo Ruler & Photo Protractor

This app allows users to take photos and add precise measurements, notes, and annotations to them. It's ideal for room planning and interior design, enabling easy collaboration and sharing of project details with clients and colleagues.

Annotate photos with measurementsAdd notes and detailsIntuitive drawing tools

📊 Productivity

Fast, Handy Measuring Tool

FAQ about Ruler Image

What are the best ruler image apps for iPhone?

Ruler® tops our ruler image apps ranking as of September 2026, with a 4.3-star average from 35K 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 Ruler® and Image Ruler - Measures.

Does Ruler® have ads or in-app purchases?

Ruler® has no ads and offers in-app purchases, according to its App Store listing as of September 2026.

How many ruler image apps are on the App Store?

We track 234+ ruler image apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.

What does the Ruler® app do?

Ruler® offers a comprehensive suite of measurement tools for your phone. It includes a classic ruler, a tape measure, and an augmented reality camera ruler. You can also use the photo measures mode to add measurement data directly to your images for documentation.

What are the key features of Ruler®?

Key features include a classic ruler, tape measure, and camera ruler mode for AR measurements. It supports dual units (inches and centimeters), offers precision sliders for accurate measurement of small objects, and allows you to add measurements to your photos.