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Online Ruler
On-Screen Ruler
Ruler.im
Pixel Ruler 2.0.2
Privacy Friendly Ruler
Ruler for Windows
Free online ruler & digital measuring ruler — measure real objects at actual size in cm, mm, and inches directly on screen. No download, instant, accurate.

Python
JavaScript
PHP
Rust
Lua
Ruby
Scala Lang
A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible

Which is more popular?
Based on our record, Java seems to be more popular. It has been mentioned 7 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | nexmetra.com | java.com |
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In their own words, as submitted to SaaSHub.


No description of Nexmetra Ruler yet.
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As answered by people managing Nexmetra Ruler and Java.
Nexmetra Ruler's answer
Most online rulers assume a fixed screen resolution (usually 96 DPI), which makes their measurements inaccurate on modern phones, laptops, and high-res monitors. Nexmetra Ruler instead tries to auto-detect your actual device's screen and calibrate to it, so the ruler shows true physical size instead of a generic guess. It also goes beyond a static ruler with point marking (measure exact distances between two spots) and measurement history (so you don't lose past measurements on refresh) — features most basic online rulers don't offer at all.
Nexmetra Ruler's answer
Most competing online rulers are just a fixed image scaled to an assumed 96 DPI, so the measurements are often wrong the moment you use a phone, laptop, or high-res monitor different from what the tool was built around. Nexmetra Ruler instead tries to detect your actual screen and calibrate to it, so what you see is closer to true physical size — and if it can't confidently detect your device, it offers quick manual calibration instead of just guessing. On top of that, it includes point marking to measure exact distances between two spots and keeps a history of your measurements, features most basic ruler tools skip entirely. It's also completely free, with no signup or download required.
Nexmetra Ruler's answer
Nexmetra Ruler is for anyone who occasionally needs to measure something and doesn't have a physical ruler within reach — from online sellers checking product or packaging dimensions, to students and hobbyists working on crafts, DIY, or design projects, to developers and designers double-checking UI element sizes on screen. It's built to be simple and accurate enough for quick, one-off measurements without requiring any signup or download, so it works equally well for a casual one-time user and someone who comes back to it regularly.
Nexmetra Ruler's answer
I needed to measure something small one day and reached for one of the many "online ruler" tools out there, only to find it was noticeably off — turns out most of them just assume a fixed screen DPI instead of accounting for the actual device you're using, so the measurements are wrong the moment your screen doesn't match their assumption. That gap seemed worth solving properly, so I built Nexmetra Ruler to detect your actual screen and calibrate to it, with manual calibration as a fallback for cases it can't confidently detect. Along the way I added point marking and measurement history, since once I was measuring things regularly, I wanted a way to track and compare past measurements too. It's a solo side project, built and refined based on real testing across different devices.
Nexmetra Ruler's answer
Nexmetra Ruler is built with Astro and TypeScript, using React for interactive components like the ruler and point-marking interface. Styling is done with Tailwind CSS v4. The screen calibration logic runs entirely client-side in the browser, using device detection signals to determine screen density without needing a backend for the core measuring functionality.
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If you want to build your career in IoT or big data, Java is arguably the best programming language to learn. Java is cross-platform compatible and offers portability and versatility to almost any type of device,...
This tool can provide favorite IP address ranges, NetBIOS information and web server detection. More features can be added by installing Java plugins.
Recommendations tracked on public social media and blogs since March 2021.


Tracking Nexmetra Ruler since Jul 2026.
You can use UPnP PortMapper. Source code/Download. All you need is Java and that's it. Hope this helps. Source: over 4 years ago
I would definitely suggest installing Java for this one, and the error should have asked you to do so. I'll have to look into why that was not popping properly for you and address it in a bug fix. In the mean time, you can address the... Source: over 4 years ago
Https://java.com/en/ Is this the java you're using to install optifine. When I first got optifine I thought java meant Minecraft and not java. Source: almost 5 years ago
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