AI detection tools are widely used to evaluate the originality of written content. However, these systems are not always accurate and can incorrectly classify human-written or lightly edited AI content as fully AI-generated, which results in negative consequences for writers and professionals.
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ClearPen · Humanizer
InputAI97%
AI detection tools are widely used to evaluate the originality of written content. These systems classify human-written and AI text using statistical patterns.
HumanizedAI4%
Publishers lean hard on AI detectors now, but they get it wrong all the time. Even the work you wrote yourself can come back flagged.
BalancedUSCasual
Every sentence scoredScore shown before & after
Citations preserved
The problem
Your real writing keeps getting flagged as AI.
Detectors aren't neutral. They punish formal style, ESL writers, and anyone whose sentences are slightly too clean. One false positive can cost you a client, a contract, or your credibility.
The implementation of artificial intelligence in modern systems
has fundamentally transformed how organizations operate.
Furthermore, the integration of these technologies enables
unprecedented levels of efficiency and scalability across
diverse industries and operational contexts globally.
⚑ AI-generated
⚑ 98% AI
⚑ Flagged
⚑ Robotic
Before and after
See exactly what changed.
Same meaning. Same voice. Clearer prose, with the detection score shown before and after.
Publishers and clients lean on AI detectors now, and those tools get things wrong often enough that people lose work over writing they genuinely did. ClearPen lets you see what a detector sees, and tightens prose that reads as flat or formulaic, without changing what you actually said.
Illustrative example. ClearPen scores your text with GPTZero, and results vary by text. Other detectors use different models and may return different numbers.
What's inside
Four superpowers. One tap.
Detector built in
See your AI score before you hit send.
Scored with GPTZero, sentence by sentence. Read the number before and after. No guesswork.
AI score (ClearPen, GPTZero-based)96% 6%
Flagged sentences91% 4%
Uniform rhythm88% 9%
Rhythm engine
Natural sentence variation, not synonym swaps.
Restructures rhythm and burstiness: the exact patterns detectors flag, fixed at the structure level.
Tone control
Formal, casual, business. Your call.
Pick the voice your audience expects. Tone stays consistent across paragraphs, never goes off-brand.
AcademicCasualProfessionalBusiness
One tap re-voices every paragraph. Casual selected.
Voice preserved
Your meaning. Your intent. Just clearer.
Keeps the argument, citations, and structure intact. We refine instead of rewriting from scratch.
meaning: kept ✓
tone: kept ✓
structure: refined →
AI score: dropped 93pts
Why trust the output
Built to be checked, not taken on faith.
Most tools in this category hand back a block of text and ask you to trust it. ClearPen shows you the score, the changes, and the reasoning, so the judgement stays yours.
Check it yourself
You never have to take our word for it.
The detector is built into the editor. Run your text before and after and read both scores yourself, on the free plan, without an account upgrade.
Nothing hidden
Every sentence is scored for you.
ClearPen scores every sentence before and after and shows your original next to the rewrite. If a sentence drifts from what you meant, you will see it and can fix it.
Your meaning stays
Arguments, citations and structure intact.
The pipeline refines phrasing and rhythm. It does not invent sources, restate your conclusions, or quietly change what you claimed.
Fair billing, enforced in the app
How it worksAlready human? We charge nothing.
If your draft already reads as human, ClearPen says so, leaves it alone and bills no words.
Pay only when it improves.
Rework a single sentence. Words are charged only if its score actually drops.
Your draft is the floor.
If a rewrite would score higher than your original, you get your original back.
AI detectors produce false positives, and the people who pay for them are usually the ones who did the work: non-native English writers most of all. We built ClearPen so a writer can see what a detector sees, and know their score before they share their work.
Why us
Most humanizers are a black box.
They hand back text and tell you nothing. ClearPen shows the score, the edits, and the reasoning.
Feature
ClearPen
Other tools
Built-in detector, every sentence scored before and after
Protect any phrase word-for-word
Fix one sentence without re-running the text
Charges nothing if your text already reads human
Preserves meaning, citations and structure
Natural rhythm, not synonym swaps
Pay-as-you-go word packs, no subscription
Free forever plan
Pricing
Free forever. Upgrade when you need more.
Cancel anytime. Annual saves 30%.
Most popular
Pro
$10/mo billed annually
80,000 words / month
- Deep Clean for stubborn text (up to 3× passes)
- Balanced & Max strength modes
- Request history + Humanize API
Power
$20/mo billed annually
250,000 words / month
- Everything in Pro
- Priority processing
- 3,750 words per request
All plans include the humanizer and the built-in AI detector. Need a one-off? Word packs from $3 for 10,000 words, no subscription. Full comparison →
Real questions
You're probably wondering…
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