I Found a Copy of My Blog Post Online — Here’s the Tool I Built to Track Every Plagiarized Version

Source: Dev.to

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):

👉 nooth.dev – 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: https://nooth.dev

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.