AI Detector by JustDone
Paste your text and see how much of it reads as AI-written. JustDone gives you a clear score, flags the exact sentences, and helps you fix them in one click.
Write Smarter. Not Just Safer.
Go beyond a plain AI score. JustDone shows the weak lines, fixes errors, and rewords flagged text. Clean up your draft in the same window, without pasting it into four other tools to get the job done.
One Click to Sound Human
Found AI-sounding text? Fix it on the spot. The tool doesn't just flag robotic writing, but rewrites it in your own voice with a single click. You keep your point and your tone, and the machine-like phrasing goes away. No retyping line by line, no lost time, and no copy-paste back and forth between apps.
Built-in Fact Checker
Catch more than AI. The built-in fact checker sorts facts from fiction, so every claim you publish holds up to a second look. One scan covers both the AI score and the accuracy of what you wrote. It means your work is clean on both counts – AI-free writing and correct facts in a single flow.
AI Detection Tool That Shows What To Fix
Stop guessing which lines look AI. JustDone’s AI detection tool marks the exact sentences that need a human touch and explains why. You get a clear plan instead of a vague warning, so you can edit, rewrite, and publish with full control. Then, rescan in seconds to confirm the changes did what you wanted.
Independently benchmarked
How JustDone AI Detection Works
Most AI detection tools read raw model output and stop there. JustDone goes further. Our detector keeps learning from new AI writing, including texts from ChatGPT, GPT-4, GPT-5, Claude, Gemini, and Llama that's already been run through a paraphraser or grammar tool.
Independently benchmarked. Read the methodology →
Signal Analysis
We scan for predictable word choices, repeated sentence rhythm, and copy-paste structure — patterns that stay even after a paraphraser or grammar tool has touched the text.
Context Validation
We check semantic consistency and flow across your entire document. Calibrated to minimize false positives in formal, academic, and non-native writing.
Confidence Report
You get a clear score, sentence-level highlights showing exactly what triggered the detection, and direct next steps on what to fix and what needs no changes.
Who Can Benefit From Our AI Detector
Accurate AI detection for academic and professional content
Get startedStudents
Worry your paper may get flagged as AI-written? Run it through JustDone before you submit. See which sentences look AI-generated and fix them in one click.
Educators
Get more than a score. See exactly which sentences in a student's paper were flagged as AI-generated. Download the report and go into the conversation with specific evidence.
Content Creators
Check your article, post, or script for AI before publishing. Find the sections that read as AI-generated and rewrite them in your voice with the built-in Humanizer.
How to Detect AI With JustDone
Run a full check in three short steps — the simplest way to detect AI in any text. No setup and no account needed for your first scan for AI text.
Paste or upload your text
Paste your text directly or upload a PDF, Word, or TXT file. Check up to 15,000 words in one scan.
Run the AI Checker
Hit Detect AI and read your results in seconds. The AI checker compares your text against output from ChatGPT, GPT-5, Claude, Gemini, and DeepSeek.
Read the report and fix flags
Open the sentence-level report to see what set off each flag. Reword the marked parts with the humanizer, then rescan to confirm the text reads clean.
Want unlimited scans, full reports, and one-click humanizing? Explore JustDone premium plans
Built for students
Know your Turnitin AI score before your professor does
Universities run papers through Turnitin's AI writing check, and you rarely see that score until it's already on your record. JustDone gives you a close estimate of it first, so you can find risky lines, fix them, and submit your work without worry.
- Estimated Turnitin AI score alongside your JustDone report
- Sentence-level highlights show exactly what to rewrite
- Rescan after fixing to watch your estimated score drop
Estimation based on our own model analysis. JustDone is not affiliated with Turnitin, and institutional results may differ.
Fair to real writers
Your own writing, recognized as yours
The bigger fear isn't AI, but getting wrongly blamed for using it.
JustDone is calibrated to minimize false positives in formal, academic, and non-native writing — the three styles most often wrongly flagged by other detectors.
Detectors that rely on simple predictability scores routinely flag essays by non-native English speakers and formal academic prose as 'AI.' JustDone validates semantic context across your whole document instead of judging isolated sentences, publishes its error rate openly, and shows sentence-level evidence for every flag — so you see why something was flagged, not just a number. And because no detector on the market is perfect, we believe a score should start a conversation, never end one.
More than an AI score
JustDone helps you find, read, and fix AI-sounding text in one place, from the first scan to the final draft. It shows the AI score and gives you the tools to act on it, all in one place.
| Feature | JustDone | Typical checker |
|---|---|---|
| Overall AI likelihood score | ||
| Sentence-level highlights showing what triggered detection | ||
| Detects paraphrased & "humanized" AI text | ||
| One-click rewriting with the AI Humanizer | ||
| Calibrated to reduce false positives, including ESL writing | ||
| 15,000-word scans with PDF, Word & TXT upload | ||
| Your text is never sold or published |
Get JustDone Premium
Everything you need to detect, fix, and perfect your writing — in one subscription.
See plans & pricing- Unlimited AI checks up to 15,000 words
- Full sentence-level reports you can download
- One-click humanizing of flagged text
- Estimated Turnitin AI score
- Built-in fact checker
- Access to every JustDone AI tool
Everything you need to know about AI detection
What is an AI detector?
An AI detector (also called an AI checker) analyzes text and estimates how likely it was written by an AI model such as ChatGPT, GPT-5, Claude, or Gemini. It doesn't "catch" AI the way a plagiarism checker matches sources — it reads the statistical fingerprints of machine writing: word choices, sentence rhythm, structure, and tone.
Every AI detection result is a probability, not a verdict. That's why JustDone pairs every score with sentence-level evidence — so you can see the reasoning, not just the number.
How AI detection works
JustDone combines several signals, each trained on large volumes of human and AI-generated writing:
Each scan moves through four stages: scan your text, analyze the signals, highlight sentences, and produce a confidence score.
Predictability
AI tends to choose the most expected next word; human writing is more varied and surprising.
Sentence rhythm
Humans mix short and long sentences; AI keeps a suspiciously consistent beat.
Structural repetition
Repeated templates, mirrored paragraph shapes, and formulaic transitions are classic AI tells.
Generic tone
An overly neutral, hedged voice with stock phrases signals machine writing.
Semantic consistency
We validate meaning and flow across the whole document, not isolated sentences.
Edited-AI traces
Patterns that survive paraphrasers and grammar tools — so "humanized" AI text is still caught.
How accurate are AI detectors?
Less accurate than most of them claim. Independent benchmarks regularly find gaps between marketing numbers and real performance — especially on edited or paraphrased AI text. JustDone publishes its real, independently benchmarked figures: 80% detection accuracy overall, 98% on academic and scientific texts, and a 10.3% error rate. We'd rather you trust an honest number than a perfect-sounding one.
Accuracy improves with longer texts, and document-level results are more reliable than single-sentence calls. Short fragments, heavily formatted writing, and lists are the hardest cases for any detector.
What to do if your work is flagged
A flag — from JustDone, Turnitin, or any detector — is a starting point, not a conviction. Here's the calm, practical playbook:
- Review the sentence-level highlights to understand exactly which passages triggered detection and why.
- Rewrite flagged sections in your own voice — or use the AI Humanizer to restore a natural tone — then rescan to confirm.
- Keep your drafts, notes, and version history. A visible writing process is the strongest evidence of authorship.
- If you're falsely accused, ask for the specific flagged passages and explain your process — detectors are probabilistic, and institutions know it.
AI detection vs plagiarism checking
They answer different questions. An AI detector asks "was this likely written by a machine?" A plagiarism checker asks "was this copied from somewhere?" Text can be original yet AI-generated, or plagiarized yet fully human-written. For academic work, run both — JustDone includes an AI plagiarism checker alongside the detector, so you can verify originality and authorship in one place.
Using AI responsibly
AI is a legitimate writing aid when your institution or employer allows it — for brainstorming, outlining, or polishing. The line is presenting AI-generated work as entirely your own where disclosure is required. Check your syllabus or company policy, cite AI assistance when rules call for it, and use detection to understand how your writing reads, not to disguise work that isn't yours.
Learn more about AI detection
Practical AI detection guides that go beyond the basics: what a flagged result really means, how Turnitin scores student work, and how to cite AI the right way.
An All-in-One Toolkit for Cleaner Writing
AI Humanizer
Rewrite AI-sounding text into clear, natural prose that reads like you and clears AI checks without losing your point.
Plagiarism Checker
Scan your text against online sources, catch matched or closely reworded lines, and confirm your work is one of a kind.
Text Summarizer
Turn long reading into short, clear notes. Pull the key points and keep the meaning so you can study or skim faster.
AI Citation
Build correct citations in seconds. Credit your sources, format references the right way, and keep your work clean before you submit.
Frequently Asked Questions
How does an AI detector work?
It analyzes text and estimates whether it was written by a person or by an artificial intelligence model. JustDone uses several detection methods:
- Text predictability measures how predictable the words used are. AI tends to choose more expected words, while human writing tends to be more varied and unpredictable.
- Sentence uniformity score evaluates whether sentences maintain similar structures. Humans naturally mix short and long sentences, while AI keeps a more consistent rhythm.
- Linguistic patterns checker identifies typical signs of AI, such as generic phrases, repetitions, or an overly neutral tone.
These methods are combined with algorithms trained on large volumes of human and AI-generated texts. Our detector calculates a score indicating the likelihood that the content was created by artificial intelligence. However, no detector is completely accurate and can make errors in both directions.
What can an AI detector detect?
It can detect and analyze diverse content elements, such as images, text, keywords, and more. It can also identify patterns, trends, and anomalies, enabling users to leverage valuable insights for their content creation and optimization strategies.
How accurate is an AI detector?
No detector is perfect. But some tools are more accurate, than others. For instance, JustDone shares real benchmarks: 80% accuracy overall and 98% on academic and scientific texts. Results are most reliable on longer documents.
Can an AI detector improve content quality?
Yes. Beyond a score, JustDone flags weak, robotic lines and helps you reword them, so your final draft reads clearer and more like you.
Is an AI detector user-friendly for content creators?
Absolutely! The JustDone AI detector is designed to be user-friendly, offering intuitive features and easy-to-use tools that empower content creators to leverage the full potential of artificial intelligence for their content creation and optimization endeavors.
What is the best AI detector?
It depends on what you're checking and how much accuracy you need. A good AI checker should catch text from tools like ChatGPT, Claude, or Gemini without falsely flagging normal human writing. JustDone's AI Detector is built to do just that — quick scans, clear results, and it holds up well even on text that's been lightly edited after being AI-generated.
What AI detector do colleges use?
Most colleges don't rely on just one tool. Some use Turnitin's built-in AI detection since it's bundled with the plagiarism software they already have, while others use standalone checkers like JustDone alongside it for a second opinion. Policies vary a lot by school and even by individual professor, so it's worth checking your syllabus or asking directly if you're unsure.
How to check for AI writing?
Just paste the text into an AI detector like JustDone and it'll scan the writing and give you a score showing how likely it is that AI was involved. It usually only takes a few seconds, and you can check anything from a short paragraph to a full essay or article.
Academic integrity built into every scan
JustDone's AI detector is built to help you understand your own writing, not to accuse anyone or prove who wrote what. Before you use JustDone on academic work, check your institution's policy on AI tools, AI detection, and disclosure. Rules vary by school, department, and assignment, so knowing yours means you can use the tool in a way that actually protects you.
Built for authentic work
Every feature in JustDone supports genuine original writing. The AI detector is a self-check before you submit, not a shortcut around your school's rules.
Honest about accuracy
An AI score is a probability, not proof. No detector is perfect, especially on short texts, so JustDone explains what each result can and can't tell you.
Trusted by educators
Teachers use JustDone to start fair conversations about AI use, with sentence-level results students see before they submit, so questions get answered in class immediately.
