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Anyone still using a classic calculator?

I feel like.we all covered this in an older thread. But maybe not.

My first calculator was a sliderule. Then I got an HP45. Many decades later I got an HP15C that I still have but rarely use for reasons I'll explain shortly. Still later, I got a HP41C. I wrote a chess program for it and entered a competition with it. I lost. Still bugs me today. I'm convinced they didn't believe it was possible and disqualified me.

Today I use an HP15C app on my phone. I love it. In portrait mode it has a simplified interface that looks like this:

Screenshot_20261029_200943_HP 15C.jpg

In landscape mode is simulates the full calculator including programming. Because it's an app on my phone it's always with me.

Screenshot_20261029_200956_HP 15C.jpg
 
I still have my original TI calculator.

While not my first, I still have my Ti-SR-50 calculator. I love the tactile feel when you depress a key.

I have an few slide rules, including an Otis King cylindrical version. I leearned how to use it but never do because I have two cell phones always within reach.

I also have solar powered school style calculators from the mid-1980s. They're indestructible. I use them when I need to audit data because I can type one handed, or pre arthritis I could, very quickly.

But really, spreadsheets are my jam.
 
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