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App 70 · 100 Apps 100 Hours

Tell human from machine before you hit send.

Litmus is a content-authenticity bench. Paste any essay, email, or article — or drop in an image — and get a clear AI-probability score backed by forensic signals, flagged passages, and a plain-English verdict. No black box, just evidence.

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See it in action

A 90-second walk through a full authenticity scan.

Everything you need to read between the lines

Evidence over verdicts — every score shows its work.

Forensic Signal Scores

Burstiness, perplexity, cliché density, and self-reference — each axis scored 0–100 so you see exactly why a verdict landed where it did.

Flagged Passage Highlights

The exact spans that read machine-written are highlighted inline, each with a short reason — boilerplate openers, buzzword stacks, templated closers.

Text & Image Analysis

Paste prose or drop in a photo. Images get checked for texture entropy, edge coherence, lighting model, and diffusion frequency fingerprints.

Tunable Strictness

Lenient, balanced, or strict shifts the verdict threshold to match your stakes — a casual review and an academic-integrity check aren't the same call.

Coming Soon

The AI upgrade that changes everything

Today Litmus scores with on-device forensics. Tomorrow — real model fingerprinting and exportable evidence reports.

Live Model Fingerprinting

Go beyond a score and estimate which model family likely produced the text — and how heavily it was edited afterward.

Planned

Author Style Baseline

Learn a person's real writing fingerprint so Litmus can flag ghostwritten or AI-assisted passages against their genuine voice.

Planned

Document & PDF Scanning

Batch-scan whole documents, essays, and PDFs at once, with a heat-mapped overview of every suspect section.

Planned

Cited-Evidence Reports

Export a clean forensic report — signals, flagged spans, and methodology — for academic integrity boards and editors.

Planned

Follow the build

Litmus is app #70 in the 100 Apps 100 Hours sprint. Watch every screen recorded and shipped — follow along on socials for daily drops, detection breakdowns, and early looks.

Got a paragraph you’re not sure about?

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Stop guessing who wrote it.

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