Screen Ruler is the ultimate pixel-perfect measurement tool for screenshots, photos, blueprints, floor plans, and any image. Whether you're a UI designer checking spacing, an architect measuring floor plans, or an engineer verifying dimensions — Screen Ruler gives you precision tools right on your iPhone and iPad.
PRECISION MEASUREMENT TOOLS
• Side Rulers — Four-sided rulers along image edges with configurable origin corner
• Freehand Ruler — Drag, rotate, and position anywhere with 15° angle snapping
• Protractor — Measure angles with pinch, pan, and rotate gestures
• Grid Overlay — Adjustable grid lines with customizable thickness and opacity
• Floating Crosshair — Always-visible position tracker with real-time coordinates
• Multi-Point Distance — Tap multiple points to measure paths and cumulative distances
• Area Measurement — Draw polygons to calculate enclosed area in any unit
SMART CALIBRATION
• Draw-to-Calibrate — Draw a reference line on any image and enter its real-world length. The app auto-calculates the scale for all measurements
• Multiple Reference Points — Set different scales for different regions of the same image
• Preset Units — Pixels (1x, 2x, 3x), Centimeters, Millimeters, Inches, Picas
• Custom Ratio — Define any pixel-to-unit ratio for specialized workflows
AI-POWERED FEATURES
• Auto-Scale Detection — Automatically detects known objects (credit cards, coins, rulers, A4 paper) and calibrates the measurement scale
• Edge Detection — Snap measurements to detected edges and boundaries for pixel-perfect accuracy
• OCR Scale Reading — Reads scale legends on blueprints and maps to auto-configure measurements
• Object Dimension Detection — Automatically detects objects and draws dimension lines
• Perspective Correction — Straighten angled photos for more accurate measurements
• Smart Suggestions — AI recommends measurement units and tools based on image type
• Color Palette Extraction — Extract dominant colors with WCAG contrast compliance checking
COLOR ANALYSIS
• Magnifying Glass — 3x magnified view with crosshair for precise pixel targeting
• RGB & HEX Values — Instant color code readout at any point
• Pixel Coordinates — See exact X/Y position relative to any corner origin
• Scaled Coordinates — View coordinates in your chosen measurement unit
ANNOTATIONS & EXPORT
• Measurement Annotations — Draw lines, rectangles, and circles with persistent dimension labels
• Angle Annotations — Measure and label angles between any two lines
• Auto-Labeling — AI suggests meaningful names for your measurements
• Export as PDF or PNG — Save annotated images with all measurement data
• Measurement History — Save sessions with calibration data for later reference
WORKFLOW & PRODUCTIVITY
• Measurement Templates — Preset workflows for common tasks (Room Dimensions, UI Spacing, PCB Layout)
• Image Overlay — Compare two images with adjustable transparency
• Apple Pencil Support — Draw precision measurement lines on iPad
• Comparison Mode — Side-by-side synchronized view for before/after analysis
• AI Measurement Assistant — Get help with unit conversions, standards, and best practices
CUSTOMIZATION
• Theme Colors — Personalize with custom color themes
• Adjustable Opacity — Fine-tune visibility of rulers, grids, and protractor
• Ruler Position — Set measurement origin to any corner
• Grid Thickness — Choose from 5 thickness levels
WORKS WITH ANY IMAGE
• Screenshots — Auto-loads your latest screenshot
• Photo Library — Browse and select any photo
• Camera — Capture photos directly for measurement
• Files — Import images from the Files app
• 3D Touch — Quick action to open latest screenshot
Localized in 40+ languages including English, Spanish, French, German, Japanese, Chinese, Arabic, Hindi, Portuguese, Korean, and many more.
PERFECT FOR
Designers • Developers • QA • Digital Artists • Crafters • Photographers • Students • Architects • Content Creators
Privacy Policy
https://infoenum.com/mobile_app_privacy_policy.html
Reset Scale to Original is not working in either Horizontal or Vertical ruler. When I pinch to size an image small and then back to 100%, the app automatically resizes my image to 109%. It will not let me size it to 100%. Or the app thinks it at 100% but falsely states it as 109%Please update this for the latest version of iOS & iPadOS and correct the minor issues I pointed out. Then you should charge a small price for this app to cover your time to keep it updated.
Developer Response
Thank you for taking the time to share this detailed feedback. We’re sorry for the inconvenience with the scale reset, and we’re already looking into improving this in an upcoming update. Your notes about iOS/iPadOS compatibility are truly appreciated. Thanks again for helping us make the app better!
Measures pixels between two points in an image
Sausalito Croc
This exactly what I needed to measure the distance between two isobars on a weather map. Having the angle between the two points is neat.One possible improvement would be to have a measure tool that returns distance (and angle) instead of reading off a ruler.
Developer Response
Thank you for the great review! We're glad the app helped with your weather map measurements and that the angle feature was useful. We appreciate your suggestion about a dedicated distance tool, it’s a great idea, and we’ll keep it in mind for future updates. Thanks for sharing your feedback!
My review
lsjdndhsnfn
I love this app it’s cool, I want no adds button
Developer Response
Thank you for your kind words and for loving the app. We truly appreciate your support.If you are looking for an ad-free experience, please note that there is a subscription and lifetime unlock option available in app settings.
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airsatotbs
I have no idea what the units of measurement are. Pixels? Mm? Certainly not cm or inches, which is what I was looking for. I wouldn’t have even thought to rate this if it hadn’t left me with such confusion. Any sort of labels would’ve changed this to no review, or even a four star. But I’m just confused. Which is disappointing.At least you can upload images of your actually screen, which is more than I can say for the last app I tried. That’s keeping this from a one star.
Developer Response
Thank you for sharing this thoughtful review. We’re sorry for the confusion around the measurement units and truly appreciate you pointing it out. Clear labels are already on our improvement list, and feedback like yours helps us make the app better. Thanks again for taking the time to let us know.
Performance improvements and bug fixes.
Version 3.1.9
The developer, InfoEnum Software Systems, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
User Content
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More
Supported Features
Dark Interface
Information
Seller
InfoEnum Software Systems
Size
24.1 MB
Category
Productivity
Compatibility
Requires iOS 15.0 or later.
iPhone Requires iOS 15.0 or later.
iPad Requires iPadOS 15.0 or later.
iPod touch Requires iOS 15.0 or later.
Mac Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
