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I'm pretty sure this existed (typing out code) can't remember the name now

https://typing.io ? I like it but feels outdated, and has many little QOL issues.

yep was this one ty, would be cool as TUI

monkeytype.com has this option, along with many many more.

Yes but the issue is those code snippets are generated artificially and are not coherent. Same issue as artificially generated prose.