Have you ever googled a paragraph from your own article…
…and found 5 other websites publishing it as if they wrote it?
That happened to me.
More than once.
After dealing with DMCA requests, unanswered emails, and plagiarism detectors that give you a “score” but no actual proof, I decided to build something of my own.
Today I’m sharing the tool I built — and use daily — to find duplicated content across the web and see exactly who copied what.
Why I Built It
I wanted three things that existing tools weren’t giving me:
Actual sources — not vague percentages
Visual diff — sentence-by-sentence similarities
Evidence — something I could send to a hosting provider or editor
And I wanted it to be instant: paste text → get proof.
That’s how Nooth.dev was born.
How It Works (Demo)
You paste any piece of content — a blog post, newsletter, documentation, product description — and Nooth.dev searches the web for matches.
Within a few seconds, you get:
A list of websites containing similar or identical content
A similarity score
A split-screen diff view (left = your original, right = the found source)
Highlighted overlaps so you can see the exact copied fragments
Domain metadata (age, authority, region)
You can try it here (3 free analyses/day):
No login required.
A Real Example: 74% Similarity Match
A few days ago I tested one of my older tutorials.
Nooth found a website hosting a barely modified version of it at 74% similarity.
The diff view clearly showed block-by-block copying.
That was the moment I realized: okay — this thing is genuinely useful.
What Makes It Different
Most plagiarism tools give you:
❌ No real source
❌ No detailed diff
❌ No transparency
❌ No usable proof
Nooth is more like a forensic tool:
It doesn’t just say “67% copied”
It shows exactly which sentences match
And from which site
If you publish anything online — especially technical content — this helps you see where your work ends up.
Free Tier (Current MVP Stage)
Right now, during early access:
3 free analyses per day (IP-based, no login)
The first results are fully visible
Additional matches are behind the upcoming registration
Everything is fully functional — just limited to prevent abuse.
Registration + unlimited mode is coming soon.
Want to Test It?
Try the live tool here:
If you find an interesting match, I’d love to hear — feel free to DM me on X or leave a comment.
What’s Next
In the next weeks, I plan to add:
User accounts
Saved reports
Email alerts when new copies appear
Automatic DMCA template
API access
I’ll share weekly progress updates here on Dev.to.
Top comments (1)
New cool features coming soon.