Skunkworks

Things I've built or pulled apart in a spreadsheet because I wanted to know how they worked. Some are experiments, some are proper models and some go a lot further than anyone strictly needs. The top of each post is public and the rest is free if you log in.

• 12 November 2026Excel Excelsior For Mac: a free formatting add-in for Excel on MacMacabacus doesn't work on Mac, so I built a free, open-source Excel add-in with one-key number, colour and border cycles and AutoColor.