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RulerInches is a free online screen ruler that lets you measure objects in inches, centimeters, millimeters, and pixels with high accuracy. It works on phones, tablets, laptops, and desktops using smart calibration and device detection—no download required.
I’m excited to share RulerInches, a free online screen ruler that makes measuring objects directly on your screen simple and accurate.
The idea came from a surprisingly common frustration: most online rulers either require manual calibration every time, don’t work well across different devices, or produce inconsistent measurements. I wanted something that just worked.
So I built RulerInches with:
* 📏 Accurate measurements in inches, centimeters, millimeters, and pixels
* 📱 Automatic device detection for phones, tablets, laptops, and desktops
* 🎯 Smart calibration for better accuracy across screen sizes
* ⚡ No downloads, accounts, or installations required
Building it wasn’t just about drawing a ruler. The biggest challenge was making measurements reliable across hundreds of devices with different screen sizes, pixel densities, and browser behaviors. I spent a lot of time refining the calibration system to make the experience as seamless as possible.
This is just the beginning. I’m planning to add more measurement tools, accessibility improvements, and features based on your feedback.
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About RulerInches on Product Hunt
“ Your Digital Ruler for Every Screen”
RulerInches was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #156 on the daily leaderboard. RulerInches is a free online screen ruler that lets you measure objects in inches, centimeters, millimeters, and pixels with high accuracy. It works on phones, tablets, laptops, and desktops using smart calibration and device detection—no download required.
RulerInches was featured in Design Tools (261.9k followers), Productivity (658.2k followers) and Tech (630k followers) on Product Hunt. Together, these topics include over 361.4k products, making this a competitive space to launch in.
Who hunted RulerInches?
RulerInches was hunted by Divij Wadhera. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Divij Wadhera