Been using Millimeter Pro – screen ruler for a couple months now. It’s basically a full-screen ruler app that lets you measure stuff right on your phone. Pretty solid if you’re into productivity tools like this.
Here’s what you can do: You just place an object on the screen and then use the built-in rulers to measure its length, width, area, and even angle. There’s also a calibration mode where you can set it up to work with common objects like coins or cards. Took me a while to figure that out but it’s really useful.
Look, if you need a decent screen ruler app, you’ll probably like this one. It’s not perfect – the ads can get a little annoying if you don’t pay for the pro version – but overall it does the job. Worth checking out if you need a basic measuring tool on your phone.