I'm building Virtual Graph Paper ( https://virtual-graph-paper.com ) which is a web app for sketching on a grid. Basically a (limited) vector graphics editor that's trying to be very approachable, aimed at use-cases where something like Illustrator or a CAD package wouldn't be a great fit. I keep hearing about new things people use it for, which is something I truly enjoy. It's free and ad-free, but there's also a paid version in the form of a downloadable Electron app or a subscription.