Comment by broadsidepicnic

TI-86 is the one in my case. We had to buy it in high school, and I used it so much in high school and in university after (I still have it in a box), that it's the only calculator I've since used. I absolutely have to have a TI emulator on my phone, and have paid for multiple ones along the years.

I use my emulated TI-86 every other day, and prefer it to any other UI I've seen on calculators on phones.

When I have a laptop available, I of course use excel or wolfram alpha for anything demanding, but when on the go, I like my emulated TI-86.