Plenty of people have compared the Apple Watch to the classic Casio calculator watch; these guys went ahead and made the inevitable app. Meet GeekWatch — the app that turns your Apple Watch into an old-school calculator watch.

I mean, sure — you could buy a calculator watch on Amazon for like 15 bucks. But where’s the meta/hipster/ironic/kinda-obnoxious humor in that?

They swap out the “Casio” brand for “Geekio” for obvious (read: legal) reasons, but the inspiration is clear.

One catch: since Apple hasn’t enabled custom watch faces yet, it’s not able to take over the entire screen, and you’ll still have some borders/margins/text around the edges.

Alas, it costs a $1. On the upside, there are myriad goodies to unlock if you poke it in the right way. Remember trying to spell words upside down to pass the time in class as a kid? That’s a good place to start.

Alternatively, check out the tizi Calc app; the Casio-style homage isn’t as direct (and also costs a buck as an in-app purchase, though the app itself is free), but it’s got that same geek-stalgia vibe going for it.