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there are ti emulators (firebird, ti48 are the open ones, there's also AlmosTI)
Firebird is for Ti-Nspire, while ti48 is for older devices (it supports A LOT of types of calculators). -
there are a lot of great app options, i kinda love HiPER (it kinda sucks at graphs, but it does literally everything you would ever want from a calculator)
Firebird emulator:
to be fair, word doesn't autosave either (unless you're using onedrive)