Repurposing isn’t reposting
Adapting one post for another platform is smart; pasting the same caption everywhere isn’t. The trouble is the two look identical from the inside — you change a word, feel like you rewrote it, and ship something 90% the same. Anyone who follows you in both places sees the seam, and the second post adds nothing. This tool makes the overlap visible: a score tells you how far apart the versions actually are, and the highlighted phrases show precisely what to rework. For turning one idea into genuinely native versions per platform, our caption generator writes to each one’s shape.
Rewrite the phrases, not just the words
The reason the score compares phrasing rather than vocabulary is that swapping single words barely moves the needle — “get 25% off” to “take 25% off” still reads as the same line. The highlighted runs point you at the whole phrases doing the duplicating, which is where a real rewrite happens: change the structure, lead with a different angle, cut a sentence. Do that to the highlighted parts and watch the score drop into the range where each version stands on its own.
Frequently asked questions
Why check how similar two pieces of text are?
The most common reason for social teams is repurposing. When you adapt one caption for another platform, it's easy to leave it 90% identical — which reads as lazy cross-posting to anyone who follows you in both places, and adds nothing for the algorithm. Running the two through this shows exactly how much overlap is left and which phrases to rework so each version feels native. It's also handy for checking a draft isn't too close to something you (or a competitor) already published, and for spotting where a template has made two posts blur together.
How is the similarity score calculated?
It compares the two texts on shared word pairs (bigrams) rather than just shared vocabulary, which means it rewards matching phrasing, not just matching words — 'summer sale is live' and 'summer sale is here' score as closer than two texts that happen to reuse common words in different orders. The result is a percentage from 0 (nothing in common) to 100 (effectively identical). Separately, it finds runs of three or more words that appear in both texts and highlights them, so the score is backed by something you can actually see and edit.
What counts as 'too similar' for reposting?
There's no hard rule, but a useful guide: under about 30% the two read as genuinely different; 30–60% share structure and some phrasing, which is fine for a deliberate repurpose; above 60% a follower would notice the overlap; and near-identical means you're really posting the same thing twice. If you want each platform's version to feel made-for-it, aim to get well-repurposed content out of the 'very similar' band by rewriting the highlighted phrases, not just swapping a word here and there.
Does this check for plagiarism?
No — it's a similarity comparison between two texts you paste in, not a plagiarism scanner. It doesn't search the web or a database to find where text came from; it only tells you how alike the two specific inputs are. That makes it perfect for comparing your own drafts and versions, but it's not a substitute for a dedicated plagiarism tool if that's what you need.
Is my text sent anywhere?
No. The comparison runs entirely in your browser — nothing is uploaded, there's no account, and nothing is stored when you close the tab. You can compare unpublished drafts or sensitive copy without any of it leaving your device.