I bet $10 that it’s vibecoded, and it’s such a dirt simple calculator that perhaps it was even done with a single prompt.

The AI just picked react because that’s the most common framework.

That's the first thing I thought when opening it. Sure looks like a "make me an app" response that Claude would output.

I mean nothing wrong with that, I needed a silly calculator thingimabob too yesterday (for some CRC checks on a piece of text) and Claude quickly cooked something up for me.

But I'm not writing blog posts about it, releasing the tool in the wild, and claiming I wrote it. Blegh.

There’s definitely nothing wrong with it normally but then like you said it’s got the blog post and the project basically clones every calculator out there that already exists.

This type of calculator is so common you can even find one on an official US government website.

https://www.investor.gov/financial-tools-calculators/calcula...