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WINNOWR

On the record

Architecture
The documented runtime uses SQLite, Cloudflare Queues, Cloudflare R2, and a local sharded index on disk.github.com · read 4 Oct 2026
Audience
Longsight presents Winnowr as academic-integrity software for institutions, with a focus on plagiarism detection and reviewable evidence.longsight.com · read 4 Oct 2026
Company history
Longsight says Sam Ottenhoff and Scott Siddall founded the company in 2004.longsight.com · read 4 Oct 2026
Corpus options
Users can build an index from their own JSONL.zst corpus; the repository also describes FineWeb-Edu and Wikipedia workflows.github.com · read 4 Oct 2026
Corpus support
Users can build an index from their own JSONL.zst corpus, with url and text fields generally needed and title optional.github.com · read 8 Oct 2026
Deployment
The README describes building the Go binaries and running the API and worker on a Linux machine.github.com · read 8 Oct 2026
Hosting and support
Longsight says it can host and support its products, and that products with a self-hosted option include a path for institutions to run them.longsight.com · read 4 Oct 2026
Integrations
The production-style runtime uses SQLite, Cloudflare Queues, and Cloudflare R2.github.com · read 8 Oct 2026
License
The repository is licensed under GNU AGPLv3.github.com · read 8 Oct 2026
Limitations
The README says source-page snippets and highlighted spans are best-effort enrichment and may be unavailable when a live page cannot be fetched or parsed.github.com · read 8 Oct 2026
Matching
It normalizes text, creates word-shingle fingerprints, searches an index for overlap, and fetches likely source pages for evidence.github.com · read 8 Oct 2026
Maturity
The README describes WINNOWR as usable but still actively evolving, with documentation and packaging catching up.github.com · read 8 Oct 2026
Purpose
WINNOWR is a CPU-first web-source detection engine for student writing and other long-form text.github.com · read 8 Oct 2026
Reports
Reports include index overlap, source URLs, and highlighted suspicious spans.github.com · read 8 Oct 2026
Runtime
The repository describes three main binaries: an index builder, an API server, and a background worker.github.com · read 8 Oct 2026
Self-hosting
The project describes itself as understandable and self-hostable, with an on-disk index and local runtime configuration.github.com · read 8 Oct 2026
Submission methods
The HTTP API accepts text or file submissions and provides submission, report, purge, and health endpoints.github.com · read 4 Oct 2026
Submissions
The API accepts text and file submissions and provides submission, report, text, purge, and health endpoints.github.com · read 8 Oct 2026

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