Litmus

WHAT'S NEW (for version 1.0)
Litmus is here. Score academic preprints across six quality dimensions. Browse arXiv, bioRxiv, medRxiv, and 5 more sources in one feed. Integrity detection flags tortured phrases, phantom references, and retracted citations. All processing on-device. Free to start, Pro when you need it.

Litmus scores academic preprints so you can focus on research that matters.

Every paper is evaluated across six quality dimensions — methodology, transparency, reproducibility, author credibility, writing quality, and integrity flags — giving you a single Litmus Score (0-100) before you invest time reading.

No AI detection guesswork. Only verifiable signals.

HOW IT WORKS

Browse preprints from 8 sources in one feed: arXiv, bioRxiv, medRxiv, ChemRxiv, SSRN, EarthArXiv, Research Square, and OSF Preprints. Select your research fields and Litmus delivers relevant papers scored and ready to evaluate.

SIX SCORING DIMENSIONS

Methodology — Study design signals, controls, sample size mentions, statistical methods.
Transparency — Data availability statements, code sharing, pre-registration, conflict disclosures.
Reproducibility — Protocol detail, replication potential, materials and methods clarity.
Author Credibility — Publication history, h-index, and retraction checks via Semantic Scholar.
Writing Quality — Readability, structure, clarity, and academic writing conventions.
Integrity Flags — Tortured phrases, phantom references, retracted citations, and paper mill patterns.

INTEGRITY DETECTION

Litmus flags papers with potential integrity issues using verifiable signals:
- 290+ known tortured phrases (synonym-substituted terms common in paper mills)
- Phantom reference detection (DOIs that don't resolve in Crossref)
- Retracted citation alerts
- Suspicious patterns in author metadata

All detection uses local dictionaries and public APIs. No probabilistic "AI-generated" claims.

FREE TO USE

- All 8 preprint sources
- 5 Litmus Scores per day
- Full integrity alerts on every scored paper
- Save up to 25 papers
- APA citation copy

LITMUS PRO (one-time purchase)

- Unlimited Litmus Scores
- Unlimited library
- AI Summaries — structured summaries via Apple Intelligence, entirely on-device
- Author Credibility Profiles
- Citation Export — BibTeX, RIS, MLA, Chicago (import into Zotero, Mendeley, EndNote)
- Offline Reading — downloa