
iruler.net
Online Rulers
On-Screen Ruler
Privacy Friendly Ruler
Ruler for Windows
AirMeasure
Nexmetra Ruler
Free and accurate online ruler to measure real objects on your screen in inches, cm, and mm. Calibrate easily for actual physical size to scale.

Cursor
Claude Code
Windsurf Editor
replit
Codeium
Tabnine
Codex by OpenAI
Your AI pair programmer. With GitHub Copilot, get suggestions for whole lines or entire functions right inside your editor.

Which is more popular?
Based on our record, GitHub Copilot seems to be more popular. It has been mentioned 389 times since March 2021.
Website, pricing, platforms and company facts side by side.
|
|
|
|
|---|---|---|
| Website | realsizeonlineruler.com | github.com |
| Pricing | — | |
| Company | — | Startup from the United States |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Online Ruler yet.
Trained on billions of lines of public code, GitHub Copilot puts the knowledge you need at your fingertips, saving you time and helping you stay focused.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of Online Ruler yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
No Online Ruler videos yet. You could help us improve this page by suggesting one.
Game over… GitHub Copilot X announced
More videos
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Online Ruler and GitHub Copilot.
Online Ruler's answer
The calibration. Every other free online ruler I've seen skips this step entirely and just guesses your PPI, which means they're wrong on most devices. If you're measuring something where accuracy matters - a ring size, a small hardware part, a piece of fabric - being off by even 2mm causes real problems. Online Ruler is also completely free with no paywalls, no account required, and no intrusive ads covering the ruler while you're trying to measure something.
Online Ruler's answer
Most online rulers just divide your screen's CSS pixels by 96 - an assumption from the 1990s when everyone used the same CRT monitor. On a modern phone or laptop that "1 inch" can be off by 30-40%. Online Ruler actually calibrates to your specific display. You hold your physical credit card (85.60mm wide worldwide by ISO 7810 standard) against an on-screen guide and adjust until they match - at that point the tool knows your screen's real pixel density and renders a true 1:1 scale ruler. You can also calibrate by entering your screen diagonal or picking your device from a database of 150+ models.
Online Ruler's answer
People who need a quick, accurate measurement and don't have a physical ruler nearby. That's a wider group than you'd think - jewelry buyers checking ring sizes, crafters and sewers measuring fabric, 3D printing hobbyists verifying print dimensions, students doing geometry, and people shopping online who want to compare a product's listed size to something physical. The tool is available in 9 languages (English, Spanish, French, German, Portuguese, Italian, Japanese, Chinese, Russian) so the audience is genuinely global.
Online Ruler's answer
I ordered a ring online and measured my finger on an online ruler that turned out to be completely uncalibrated. Wrong size, had to return it. When I looked into why it was wrong, I found that basically every free online ruler on the internet makes the same mistake - they assume 96 DPI and call it a day. The actual pixel density of modern screens varies from about 90 PPI on a big desktop monitor to over 500 PPI on a flagship Android phone. So I built one that actually solves this with a proper calibration step. The credit card method came from realizing that one physical object almost everyone has in their pocket has globally standardized dimensions.
Online Ruler's answer
It's a free consumer tool with no accounts, so there's no customer data to pull from. But based on usage patterns and the guide content that gets the most traffic:
Jewelry buyers and makers measuring ring sizes at home Sewers and crafters measuring fabric and patterns 3D printing hobbyists verifying print accuracy Students needing a ruler for schoolwork Online shoppers comparing product dimensions to real objects
Share your experience with using Online Ruler and GitHub Copilot. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


We have no reviews of Online Ruler yet. Be the first one to post
GitHub Copilot is a powerful tool that developers use to boost their productivity and streamline their coding process with the aid of AI.
Accelerated handling of repetitive tasks: You already know how to write a pagination query or scaffold an endpoint, so why waste time? Tools like GitHub Copilot or Codeium handle the boilerplate so you can focus on...
GitHub Copilot Chat is similar — you can ask it to explain code or suggest improvements. It's integrated right into VS Code, so it feels pretty seamless. They've been rolling out some new features lately, like better...
Recommendations tracked on public social media and blogs since March 2021.


Tracking Online Ruler since Sep 2026.
I build Browy, an open-source AI agent that lives In a Chrome side panel and a DevTools REPL. It drives the real browser Tabs you have open. The thing it does not have is its own subscription. It uses your existing GitHub Copilot... - Source: dev.to / 16 days ago
Snagly is a free, MIT-licensed set of 30 skills for AI coding agents — GitHub Copilot, Claude Code, Cursor, Codex and 70+ others — that turn "an AI that can drive a browser" into "an AI that tests like a QA professional." A skill, if you... - Source: dev.to / 2 months ago
Where llms.txt genuinely gets read is a different layer: coding and agent tooling — Cursor, Claude Code, GitHub Copilot, Windsurf — pulling a documentation site's pages with less token waste, plus emerging agent protocols like OpenAI's... - Source: dev.to / 4 months ago
When comparing Online Ruler and GitHub Copilot, you can also consider the following products.

Online ruler in actual size - cm & inches.
Compare iruler.net to Online Ruler or GitHub Copilot:

The AI-first Code Editor. Build software faster in an editor designed for pair-programming with AI.
Compare Cursor to Online Ruler or GitHub Copilot:

Online ruler to quickly measure objects on any device with any screen size. Accurate, user-friendly, supports both cm and inches. Perfect for instant size checks without needing any tools!
Compare Online Rulers to Online Ruler or GitHub Copilot:

Transform hours of debugging into seconds with a single command. Experience coding at thought-speed with Claude's AI that understands your entire codebase—no more context switching, just breakthrough results.
Compare Claude Code to Online Ruler or GitHub Copilot:

lightweight, free, semi-transparent ruler
Compare On-Screen Ruler to Online Ruler or GitHub Copilot:

Tomorrow's editor, today. Windsurf Editor is the first AI agent-powered IDE that keeps developers in the flow. Available today on Mac, Windows, and Linux.
Compare Windsurf Editor to Online Ruler or GitHub Copilot: