It will work almost all the time when correcting your spelling, but many times it misses the grammar, hence not as polished as Grammarly.

Example:
OK, so I write the text, and it will correct me attempt (this sentence is correct according to LanguageTool

However, according to Grammarly it corrected my text to (OK, so I write the text, and it will correct 'my' attempt) which, I believe, is better.

There are many more cases where LT cannot detect the proper grammar. Also, I am on premium plan with ''Enhanced grammar, punctuation and style checking''. The only reason I use it because it helps me with additional language. Overall, it is decent for the job, but if you speak only English, then I don't recommend it.