That would be pretty bad if I didn't build my own website. Note that I put a lot of pride in the appearance of the products I build, even if it isn't exposed to the outside world. You'll see that this website works well on all devices...desktops, tablets, and smartphones.
Track statistics for Player Unknown Battleground® (aka PUBG). Users of the app can see stats for each game and get served up Google ads after every 8 refreshes. Check it out on the app store.
A customer saw an opportunity to automate a very manual process of comparing two different bill of material documents before filling an order. Using a complex set of rules this comparison can be done in seconds, with a nice clean output of the comparison results.