Claude Originality checker

GPTCleanup Pro's Claude Originality checker reads a passage and reports the habits typical of Claude's default voice, the kind of signal a provenance-and-originality style review tends to weigh, with each pattern named and explained rather than compressed into a single guessed number.

It's a server tool by necessity. Scoring against a writing-pattern model is too heavy to run in a browser, so text is sent to our AI server and the result returns to the page. You get 5 free checks in any rolling 24 hours, no account required.

The output is a list, deliberately. A checker that returns a bare percentage is asking for unearned trust; this one names each pattern (a hedging opener, a stacked subordinate clause, an elevated em-dash count) so the reasoning is available for inspection.

A provenance-style check tries to trace where a passage of text originated: whether it was likely generated by a model, and whether it closely resembles content that already exists elsewhere on the web.

Self-reuse is a narrower, often overlooked component: a writer's own earlier published work can resemble something seen before, without AI or plagiarism entering into it. It's a separate question from whether Claude specifically was used.

One round trip to the server, then a reasoned result. No configuration required beforehand.

Step 1

Paste the sample. A longer passage gives the model more structure to weigh than a single sentence would.

Step 2

Run the check. The text is sent once to our AI server, scored against Claude's writing patterns, and nothing further is done with it.

Step 3

Review each flagged pattern and its stated reasoning, an argument you can inspect rather than a number you're asked to trust.

No, and stating that plainly is more useful than avoiding it. Its classifier and underlying content index are proprietary, and the company revises them without public notice. Any claim to reproduce its output would be guesswork dressed up as precision.

This tool has no access to that system, so what it offers instead is a defensible, separate signal: whether the writing carries habits typical of Claude's default voice.

Training leaves a recognizable stylistic fingerprint, distinctive enough to describe precisely, and one that overlaps considerably with structures taught directly in careful academic and ESL writing.

Hedging openers

A claim introduced by softening it first before the actual point arrives.

Balanced two-sided framing

A reflex to pair every claim with its counterpoint, independent of whether the subject calls for balance.

Heavy subordinate clauses

Sentences extended by clause after clause hung off commas, in place of shorter sentences set side by side.

A closing offer to continue

A paragraph that closes by offering to expand, revise or continue further.

A flag from this tool, or any detector, is a signal rather than a finding. Institutions set their own policy for what follows, and evidence of process is the strongest response available.

Preserve your drafts

Outlines and earlier versions are the clearest evidence a piece was composed, not generated whole.

Retain version history

Docs, Word and most editors log revisions automatically; leave it intact while a question is open.

Ask for the named signal, not the label

A specific pattern can be examined on its merits. An unexplained score cannot.

The same checker, applied at different points in a review process.

Content and editorial teams

A first pass on drafts before committing editorial time, particularly on unusually hedged or cautious pieces.

Publishers

A second read on submissions that read unusually careful before deciding whether to look closer.

Freelance writers

A check on delivered work before a client runs its own review.

This checker is server-side by design: scoring against Claude's writing patterns requires a model too large to ship into a page, so each check is a single round trip rather than local computation.

That trip is metered rather than unlimited: 5 free checks in any rolling 24-hour window, tracked without an account. It reopens as the window rolls forward rather than resetting at a fixed hour.