Simple Grammar and Spelling Check

I desperately need a spelling and grammar checker like Grammarly or something similar. I usually write without relying on AI, as I want to be the author, not the machine. However, since English is not my native language, I tend to make some mistakes.

I mainly use AI to get inspiration, so it’s not a feature I’d want to miss, but without something to check my writing, it’s tedious at best. I know there are plugins that should, in theory, do that, but I have yet to find one that actually works as I want it to.