Text forensics, not guesswork

The litmus test
for writing that matters.

Litimus scores rhythm, phrasing, and repetition the way an editor reads a manuscript — then shows its work sentence by sentence, so you can see exactly why it turned the color it did.

6signals scored per passage
<1sto analyze 2,000 words
0text stored without consent
MANUSCRIPT.TXT
Processed in your browser — never stored or sent anywhere unless you download the report.
57 words
HumanMixedAI-likely

Margin notes

How to improve this score

    Edit your draft with the notes above, then paste the revised version back in — most writers see a real shift after a few targeted changes.

    No detector — including this one — can prove authorship with certainty. Scores reflect statistical writing patterns, not a verified fact. Treat results as a starting signal, especially for anything with real consequences.
    Process

    Three steps, no upload queue.

    Everything below runs the moment you paste text — nothing leaves your session unless you save a report.

    01

    Paste or drop a file

    Plain text, a Google Doc link, or .docx / .pdf on paid plans. 25-word minimum for a stable read.

    02

    Litimus reads it line by line

    Sentence rhythm, phrase frequency, vocabulary spread, and repetition are scored independently, then combined.

    03

    Get a scored, annotated report

    A single likelihood score plus margin notes pointing at exactly which sentences moved it.

    Under the hood

    What Litimus actually measures.

    No black box score. Every signal below is visible in your report.

    01 Burstiness

    Human sentences swing between short and long; AI output tends toward a narrow, even rhythm. Low variance raises the score.

    02 Stock transitions

    Phrases like "moreover," "it is important to note," and "in conclusion" cluster far more densely in generated text.

    03 Vocabulary spread

    A low ratio of unique words to total words suggests safe, repeated word choices rather than a wide natural vocabulary.

    04 Phrase repetition

    Repeated three-word sequences across a passage are rare in human drafts and common in generated ones.

    05 Punctuation fingerprint

    Overuse of em dashes and semicolons, or an absence of the small errors humans make, both shift the score.

    06 Structural symmetry

    Paragraphs of near-identical length and matching openers read as templated rather than composed.

    Fine print, upfront

    Detectors are evidence, not verdicts.

    We'd rather lose a sale than oversell what statistical detection can do. Every report on Litimus carries the same caveats we're stating here.

    Pricing

    Pay for how often you check, not for access to checking.

    Every tier includes the full margin-notes report. Higher tiers add volume, file types, and integrations.

    Free
    $0
    forever
    For the occasional check.
    • 2,000 words / day
    • Plain text & paste only
    • Full margin-notes report
    • Score history: 24 hours
    Start free
    Student
    Student
    $4/mo
    billed monthly · student-verified
    Full Pro limits at a student rate, wherever you study.
    • 25,000 words / day
    • .docx, .pdf, Google Docs import
    • Draft-history comparison
    • Citation-safe export for tutors
    • Re-verify yearly, any country
    Verify & join
    Team & API
    $49/mo
    from, 5 seats included
    For schools, publications, and platforms.
    • Unlimited scans, pooled seats
    • REST API, usage-based overage
    • LMS & Google Classroom integration
    • Admin dashboard & audit log
    • SSO on request
    Talk to us
    🎓
    Student pricing is a real discount, not a trial. Verify once a year through our global student-verification partner and keep Pro-level limits at $4/mo — about the cost of one coffee, because we'd rather have students checking their own drafts than avoiding the tool entirely.
    +

    Just need more words today?

    A one-time top-up for a single deadline — no subscription, no recurring charge. Adds 10,000 words to your daily limit, valid for 24 hours, stacks on top of any plan including Free.

    $3once-off
    Buy a day pass
    Questions

    Before you paste anything in.

    Can Litimus tell me for certain that something was written by AI?
    No — and no detector on the market can, honestly. Litimus gives you a probability based on writing patterns, plus the exact reasons behind the number, so you can weigh it yourself rather than take a black-box verdict.
    How is the student plan verified?
    Through a third-party student-verification service (the kind Spotify and Amazon use for student pricing) rather than a bare .edu check — it recognizes academic domains and enrollment records across most countries, not just the US, and falls back to a student-ID upload if your institution doesn't use a standard email pattern. We re-verify once a year.
    Do you store the text I scan?
    Free and Student scans are processed in-session and discarded. Pro and Team plans can opt into saved report history for their own records — off by default.
    Does heavy editing of AI output fool the detector?
    Often, yes, to a degree — this is a known limit of statistical detection industry-wide, which is why we show a confidence range and margin notes instead of a bare pass/fail stamp.
    What if I just need more words for one deadline?
    Buy a one-time day pass ($3) instead of upgrading your plan — it adds 10,000 words to your limit for 24 hours, works on top of Free or any paid tier, and doesn't auto-renew or commit you to anything ongoing.
    Is there an API?
    Yes, on the Team & API plan — REST endpoints for scanning, batch jobs, and webhook callbacks, billed on included volume plus metered overage.
    Ready when you are

    Paste your first passage. It's free, and it takes less time than reading this footer.

    Scan a passage