Paste two to five candidate titles. The tool measures length against the visible-character cutoff, surfaces signal patterns (numbers, year, question, brackets, all-caps ratio, emotion words), and shows a search-result preview for each. No predictions, no scores. Just the comparison data, side by side, so you can pick.
Highlighted words appear in two or more of your variants. The rest are unique to a single variant. Heavy overlap means your variants test the same hook with cosmetic changes; little overlap means they test genuinely different framings.