Why autocorrect doesn’t save you
Both spellings are real words, so a plain spell checker never flags them. It takes a grammar check that looks at the next word (“your welcome”, “you’re car”) to notice the mix-up, which is what TextCheck’s grammar rules do.
Catch it automatically
The grammar checker flags common mix-ups like this one by looking at the words around them, and the sentence checker can explain any sentence you’re unsure about.