Show HN: I made a tool to help test responsive designs on my laptop (opens in new tab)

I do all my work from a laptop with no external monitors, and testing responsive designs is a massive pain. Every change meant either resizing my browser window over and over, or clicking through different devices in the dev tools.

Modern websites need to work on everything from phones to massive desktop screens. Trying to catch all those layout bugs by checking one size at a time is tedious and you'll probably miss something. Browser dev tools are great, but flipping between different device sizes is cumbersome, and it's can be hard to spot when something breaks.

So I built Paneful to scratch my own itch. Now I can see my site on a phone, tablet, and desktop all at once. No more tedious resizing or device-switching - just instant feedback when something looks off. Plus, being able to arrange the viewports however I want means I can set up the perfect testing layout for whatever I'm building.

It made my life easier, I hope it does the same for you.