I was on the bus trying to submit one of my apps to an online directory when I realized I had no screenshots on my phone.
But then again, my screenshots were always plain, no background… and figuring out if they used the right ratio was always a drag.
That’s when it hit me: making good-looking screenshots shouldn’t be this annoying.
So I built scrnsht.app, small tool to generate clean, properly sized screenshots with the background and layout you want.
No install, no fuss, works on desktop and mobile.
Here's a screenshot:

And here's an example result, made in seconds:

I don't know how other screenshot taking apps do it but this uses the browser's built-in screen-share features so I'm not reinventing the wheel here.
Features:
Pick a background from the presets, upload your own, or paste an image URL
Choose the exact ratio and padding around the screenshot
Toggle a drop-shadow on or off
Share directly to social networks (or messaging apps) if you're on mobile
It’s free, and it’s meant to be useful for other builders, founders, and makers who like me just want nice screenshots without the pain.