Not so much "excited" as "interested": it's 30 years old, and just ask yourself how many OSs and CPU architectures and development environments it has been ported across while retaining some degree of continuity.

I realize most folks on HN trend young and are always interested in the latest new hotness, but here's a tool I remember from when I first began using Macs (in the early 90s) and it's still with us and under active development, unlike the overwhelming majority of hobbyist software projects. There are lessons in here.

In addition to the sibling comments, I find it interesting to compare to a cross-platform Electron-based app.

By building for Mac, the developer was able to target every Apple platform, sometimes with minimal effort, and leverage platform tools like AppleScript for integration.

The Mac has a long history of high quality native apps, and it’s nice to see one survive, even thrive.

I always geek out showing others Numi: https://numi.app/

The ability to use variables in a calculator is exciting to me because it is so easy and because it helps decrease errors.

Even 30 years ago people took calculator apps for granted. This one is a very nicely polished one - the perfect example of what not taking things for granted looks like - and his story is also kind of a dream for a lot of programmers: finding an audience for something well done, and making a decent amount of money building something you like. His hobby lead him to meet and receive compliments from people he cared about, which beats working on ERP forms.

The way I look at it is that 30 years ago this guy created an app. He's kept it updated and it has provided a living. Not bad and not something most of us have achieved over that extended timeframe.

It's impressive.

I use PCalc regularly; on both my Mac, and my i-devices.

I wouldn’t say I’m “excited” about it, but it’s an invaluable tool.

I’ve probably been using it for most of its life.

Same with BBEdit, which is of a similar vintage.

Because other people exist with needs and priorities that differ from yours.

Couldn't one say the same thing about... computers? Yet here we are...