AI detector and humanizer for students
Check your own draft before you submit it. Leap runs free AI detection and cleanup tools in your browser, with no account and nothing sent anywhere.Check your paper before you submit
Leap's detector runs entirely in your browser. It is free, needs no signup, and your text is never sent anywhere. Paste a draft and you get a score from 0 to 100 based on writing signals: uneven versus uniform sentence length, stock AI phrases, hedging and transition words, em-dash density, and repetition. Sentences that weigh most on the score are highlighted so you know where to look.The score is a signal, not proof. It can be wrong, and it should never be the only basis for any decision about your work or anyone else's.The student's problem, in five concrete pains
AI is genuinely useful for research and drafting, but universities are deploying detection software faster than students get clear guidance on what is allowed. Here is what actually goes wrong:- Detectors flag the draft, not the idea. You read ten papers, synthesized them with AI help, then rewrote in your own voice. What remains is uniform rhythm and stock phrasing, and that is what gets scored.
- False positives on original work. International students and anyone trained on formal academic prose can score high even on fully original writing, a bias documented in published research on AI detectors.
- Policy confusion. One professor allows ChatGPT for brainstorming; the next bans it entirely. Meanwhile Turnitin only shows scores to instructors, so students cannot check themselves.
- No way to self-check. Turnitin does not offer a student-facing version of its detector, so you submit blind and find out afterward if you tripped the AI meter.
- Penalties are disproportionate. An academic-integrity flag can follow you into transcripts, grad-school applications, and professional licenses.
How Leap helps with each pain
- Sentence-level detection, no signup. Paste any draft into the free detector and see which sentences carry the signals that raise a score: uniform sentence length, stock AI phrases, hedging, em dashes, repetition.
- A cleanup pass, not a rewrite machine. The humanizer replaces stock AI phrases, removes em dashes and invisible characters, adds contractions, and marks sentences of uniform length so you can vary them yourself. Your argument and citations stay yours.
- False-positive evidence. If your original writing gets flagged, the per-sentence breakdown shows which patterns weighed on the score, often em dashes, parallel structure, or hedging language common in formal writing. You can take that breakdown to your professor as part of a discussion.
- Free for real use. Both the detector and the cleanup pass run in the browser for free, with no account and no word limit tied to a plan.
Three realistic scenarios
These examples show how students typically combine the detector and the cleanup pass. Scores vary from draft to draft; there are no guaranteed numbers.Scenario 1: Lit review for a history seminar
You read five sources, asked an AI to summarize each one, stitched the summaries into a draft, then added your own argument. Run the draft through Leap's detector: the summary paragraphs will usually light up as uniform and stock-phrased, while your own argument reads more varied. Clean up the flagged passages, rewrite the weakest sentences by hand, and re-check before you submit.Scenario 2: Lab report that reads too clean
You wrote the lab report yourself, but it still reads like a detector's target: short sentences, parallel structure, passive voice, formulaic phrasing. Run the detector to see which sentences carry those signals, then rewrite those specific sentences to add length variance and concrete detail. The cleanup pass also strips em dashes and marks the uniform sentences so you can vary them.Scenario 3: Personal statement for grad school
You drafted with an AI assistant, revised heavily, and the piece now feels like yours. Run a final detection pass, use the cleanup tools on the flagged spots, then re-read everything carefully to confirm every sentence still carries your voice. If a change alters your meaning, revert it and rewrite that sentence by hand.The responsible-use note
Leap is a tool for students who use AI to research, brainstorm, and draft, and who want their final submission to read as their own voice. It is not a tool for submitting raw AI output without contributing your own thinking, and the humanizer does not guarantee passing Turnitin or any other checker. Know your course policy. When in doubt, disclose AI use.What the detector actually measures
Detectors respond to signals in the writing itself. Leap scores your text 0 to 100 from the following signals and highlights the sentences that weigh most:| Signal | What it looks like | What to do about it |
|---|---|---|
| Uniform sentence length | Every sentence roughly the same medium length | Mix short and long sentences deliberately |
| Stock AI phrases | Filler openers and closers that models repeat | Replace them with specific, direct wording |
| Hedging and transitions | Heavy use of cautious connectors | Cut them or state your point plainly |
| Em-dash density | Frequent em dashes as punctuation glue | Use commas, colons, or plain hyphens |
| Repetition | The same words and structures recurring | Vary vocabulary and sentence openings |