Most "online ruler" tools you'll find just guess at your screen's pixel density and hope for the best, and they're often extremely inaccurate. Rulerly fixes that with a 15-second calibration using any card in your wallet (they're all the same size), so what you see on screen is actually true to scale. In addition it features tracing tools, moving/resizing features, diagonal mode, and it works on any device.
Viktor.comAn AI coworker that actually does the work
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Hey everyone, creator here. I built Rulerly because anytime I needed to make a convenient measure of something there was nothing out there that was accurate or had the features I need. That's why Rulerly has the calibration step instead of assuming the pixel density on your phone, so you can you actually trust the measurements you make. I also implemented some features that weren't available anywhere else, like the ability to trace, having the ability to move the ruler around or adjust the length, and angling it any direction. If you think you'll one day find this useful feel free to check it out and let me know what you think. Cheers.