To help me write the words in my Up Goer Five picture, I taught my computer to watch my writing and tell me when one of the words I used wasn’t in the top ten hundred. After I put up my Up Goer picture, other people made things to check writing, too (like this one).

When I decided to write Thing Explainer, I went back to the writing checker I had used and made it better. Now, I’m happy to be able to share it with everyone!