We don't detect AI text.
We detect how text is made.
AI text detectors are broken — they contradict each other and are defeated by any paraphraser. Invisible Pencil monitors the writing process itself: 50+ behavioural signals captured keystroke by keystroke, impossible to fake.
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Avg. Authenticity
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Large content block inserted with no prior typing activity detected.
Emily Chen · 14 min ago
Trusted by content teams worldwide
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Behavioural signals tracked
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Real-time analysis
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Bypassable by paraphrasers
10k+
Documents verified
Every tool you need to verify authentic writing
From real-time monitoring to deep behavioural analytics, Invisible Pencil gives content teams complete visibility into how their content is produced.
Behavioural Fingerprinting
WriteTrace captures over 50 unique behavioural signals — typing rhythm, pause patterns, correction frequency, and cursor movements — building an authentic writing fingerprint for every writer on your team.
Live Session Monitoring
Watch writing sessions unfold in real time from your admin dashboard. See who is actively writing, their current word count, typing speed, and session duration as it happens.
Process-Level Verification
We do not scan the finished text. We verify the entire writing process — from the first keystroke to the final character. If content was typed by a human, we can prove it. If it was not, we will flag it.
Smart Alerts & Notifications
Instant alerts when suspicious behaviour is detected — sudden content dumps, implausibly fast typing, unnatural consistency, or copy-paste events that deviate from a writer's established baseline.
Session Comparison Analytics
Compare sessions side by side across time. Track how writing behaviour evolves and identify when a writer's patterns suddenly shift — a key indicator of AI-assisted content.
Grammar & Clarity Checker
Built-in AI-powered grammar checker helps writers deliver polished, professional content without leaving the platform. Spelling, grammar, and clarity suggestions in one click.
They contradict each other.
And they are trivially bypassed.
Run the same article through three different detectors and you will get three completely different answers. Then run it through a free paraphraser — and all three say it is 100% human.
Same article. Three detectors. Three different results.
The article below was fully generated by ChatGPT. Here is what each detector said:
| Detector | AI probability | Verdict | Confidence |
|---|---|---|---|
| Detector A (e.g. GPTZero) | 87% | AI-generated | High |
| Detector B (e.g. Originality.ai) | 34% | Mostly human | High |
| Detector C (e.g. Writer.com) | 11% | Human-written | High |
Three detectors. Three different verdicts. Which one do you trust? The answer is: none of them reliably. And after one pass through QuillBot or Undetectable.ai, all three report 100% human.
The bypass is trivially easy
- 1Generate article with ChatGPT or Claude
- 2Paste into a free paraphraser (QuillBot, Undetectable.ai)
- 3Submit the paraphrased version
- 4All AI detectors now report: "100% Human"
Why Invisible Pencil cannot be bypassed
We do not read the text
Paraphrasers change words. They cannot change the fact that no typing happened.
We record keystroke-by-keystroke
Every character, pause, correction, and cursor movement is logged in real time.
No typing = automatic flag
A 1,200-word article that appeared in 4 seconds will always trigger an alert — no matter how "human" it reads.
The fundamental difference
Text detectors ask: “Does this look like AI?”
We ask: “Was this actually typed by a human?”
Those are fundamentally different questions. The first can be fooled by changing the words. The second cannot — because it is based on behaviour during the writing process, not the finished product.
See it for yourself — freeUp and running in minutes
Invisible Pencil is designed for immediate deployment. No technical setup, no integrations required — just invite your team and start monitoring.
Step 1
Invite your writers
Add writers to your workspace in seconds. Each writer gets a dedicated editor environment where their sessions are tracked automatically from the first keystroke.
Step 2
Writers produce content naturally
Writers use the Invisible Pencil editor just like any word processor. There is no disruption to their workflow — behavioural data is captured silently and securely in the background.
Step 3
You get instant verification
As soon as writing begins, your admin dashboard populates with live metrics, session scores, and authenticity confidence ratings. No waiting, no manual review.
Step 4
Act on the data
Investigate flagged sessions, compare behavioural baselines, and make confident decisions about content authenticity backed by objective, tamper-proof data.
Looking at finished text will never be enough.
AI paraphrasing tools bypass every text-based detector on the market
Freelancers submit AI content and charge human writing rates
Three different detectors give three completely different scores
Clients pay for expertise they never actually receive
Plagiarism checkers only catch copied text — not generated text
Monitor the process, not just the output.
Captures writing behaviour — impossible to fake with any AI tool
Real-time session data proves content was typed keystroke by keystroke
Behavioural baselines detect sudden pattern changes automatically
Live dashboard gives admins instant oversight of every writer
Objective authenticity scores backed by data, not text guesswork
50+ behavioural signals. One authenticity score.
Invisible Pencil analyses every dimension of the writing process simultaneously. From micro-pauses between words to macro-level session structure, every data point contributes to a comprehensive authenticity score that is virtually impossible to game.
Start monitoring for freeInvisible Pencil vs. text detectors
Understand exactly what makes process-level verification a different category of tool.
| Capability | AI Text Detectors | Invisible Pencil |
|---|---|---|
| Consistent results across runs | ||
| Cannot be bypassed by paraphrasers | ||
| Works regardless of writing style | ||
| Proves the writing process happened | ||
| Real-time live monitoring | ||
| Analyses finished text patterns | ||
| Requires no writer interaction | ||
| Post-submission analysis |
Start free. Scale when you are ready.
No per-seat fees, no hidden charges. One flat monthly rate for your entire workspace.
Free plan
Try the platform with no commitment.
- 5 documents per month
- Up to 2 writers
- Basic behavioural metrics
- 800 word limit per document
- Live monitoring dashboard
- Authenticity scoring
- Smart alerts & notifications
- Grammar checker
- Session comparison analytics
- Plagiarism checker
Premium plan
Best valueFull access. Unlimited everything.
- Unlimited documents
- Unlimited writers
- Full behavioural engine
- No word limit
- Live monitoring dashboard
- Authenticity scoring
- Smart alerts & notifications
- Grammar checker
- Session comparison analytics
- Plagiarism checker (coming soon)
Payments processed securely by Stripe. Cancel anytime. No lock-in contracts.
“We manage 40+ freelance writers and Invisible Pencil gave us complete visibility for the first time. We caught three AI-submitted articles in the first week that looked completely human on the surface.”
Sarah Mitchell
Head of Content, DigitalFirst Agency
Knowledge base
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Best Practices Guide
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Frequently asked questions
Everything you need to know about Invisible Pencil and how it works.
Still have questions? We are happy to help.
Contact supportStop guessing.
Start verifying.
Text detectors give you probabilities. Invisible Pencil gives you proof. Join content teams who verify genuine human authorship at the process level — free to start.