“Other than”, “rather than”, “no sooner … than”
These fixed phrases always use “than” because they compare: “anyone other than you”, “walk rather than drive”, “no sooner had we arrived than it started to rain”.
Than I or than me?
Both are accepted. “She is taller than I” (short for “than I am”) is traditional and formal; “She is taller than me” is standard in everyday speech and writing, as Merriam-Webster and most modern usage guides note.
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.