HumanPen vs PaperBleach: a document, or a text box with a score
PaperBleach rewrites pasted text and shows you a detection score in the same screen. HumanPen takes the file, works inside it, and hands the file back.
Competitor details verified 2026-09-05. Their own site is the authority.
The short answer
PaperBleach pairs a rewriter with its own detector, so you paste up to 2,500 words, rewrite, and see a score without leaving the page. That loop is the thing it is built around, and we do not have it. HumanPen has no detector at all: you bring a Turnitin or iThenticate report, and we work on the document itself, returning the same DOCX or PPTX with its formatting intact. Which one fits depends on whether you are holding text or holding a file.
Side by side
| HumanPen | PaperBleach | |
|---|---|---|
| Input | Upload the document itself | Paste text |
| Output | The same file back, still editable, layout intact | Plain text |
| Per-request word cap | None | 2,500 words, the same on every plan including the top one |
| Built-in AI detector | None — you bring a report | Yes, scored before and after in the same screen |
| Detection report import | Turnitin / iThenticate, flagged passages only | None |
| Billing unit | Credits, charged on the words actually rewritten | A monthly allowance of rewrites, counted per run |
| Free tier | 100 credits on sign-up | One rewrite a month, plus 300 detector checks |
| Trial terms | No trial to cancel | $4.99 for seven days, then renews at $17.99 a month |
| Agent / API integration | Skill, MCP, and REST API — callable from AI agents | None listed |
| Around the rewriter | Condense, citation fix, translate | AI detector, APA converter, editor, transcription add-on |
When to pick PaperBleach
- You want the score in the same place as the rewrite. Their detector runs on the output and shows a before and after; we have nothing equivalent, and getting a report from elsewhere is an extra step.
- What you are holding is text, not a document. If you are pasting a few paragraphs out of an editor anyway, a file-shaped workflow buys you nothing.
- You want the tools around it. The APA converter, the editor and the transcription add-on sit in the same subscription.
- You would rather pay a flat monthly fee than watch a balance. Their allowance is a fixed number of rewrites a month; ours is metered.
Where the two shapes diverge
The 2,500-word cap is per rewrite, and it is the same on the free plan and on the $36-a-month one. Paying more buys more runs, not longer ones. For anything dissertation-sized that means splitting the text yourself, rewriting the pieces separately, and putting them back together — and the joins are where a document's consistency usually goes.
Their unit is a run; ours is the words that actually changed. If a report flagged three paragraphs in a forty-page chapter, a run and a paragraph cost them the same, while we charge for the paragraphs. That difference only matters if you are working from a report, which is the case we are built for.
We have no detector. It is a real gap, not a positioning choice we can talk our way around: you have to get a Turnitin or iThenticate report from your institution or elsewhere before our targeting has anything to aim at. What we do with that report is rewrite only the passages it flagged, keep everything else untouched, and hand back the same file — and if the recheck still flags some of it, importing the report again gets those parts rewritten free.
FAQ
Can I use their detector and your rewriter?
Their score is their own model's reading, and it is not the report your institution runs. If your school uses Turnitin, the report that decides anything is the Turnitin one, and that is the report our targeting reads.
Which humanizer is more effective?
We have run no head-to-head test and will not give you a fabricated number. Judge it on your own document.
Is the 2,500-word cap really the same on every plan?
That is what their pricing page showed when we checked on 5 September 2026: 2,500 words per rewrite on the free, Premium and Ultra plans alike, with the plans differing in how many rewrites a month you get. Check their current page before you rely on it.
Can I use both?
Yes. Nothing stops you pasting a section into theirs to see a score and running the finished file through ours. They are priced separately, so it is two subscriptions worth of overlap if you do it routinely.
The only comparison that settles it is your own document
New accounts get 100 credits - enough to run a full section of your own writing through and judge the result yourself.
Try it on your document