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Noplag

Noplag is an open-source plagiarism detection engine (Apache 2.0) with a production cloud tier. We combine plagiarism detection and AI-content detection in one tool. Founded in Kyiv in 2014; HQ relocated to San Francisco in May 2022. Engineering across Ukraine, Poland, and Spain. Position: open-core, honest about limitations (AI detection is "a signal, not a verdict"; we publish ESL false-positive rates), audit-friendly. Built for SMB educational institutions, developer-built EdTech, agencies, p

Authority
47 reach 6 · trust 5 · quality 21 · freshness 15
Tier
listed
llms.txt
https://noplag.com/llms.txt
Sections
11
Links
45
Size
9316 bytes
Popularity rank
#755405
Country
United States
For agents
Documentation: developer or product docs worth reading, nothing to call
First seen
2026-10-19T10:44:45.631Z
Last checked
2026-10-21T14:54:35.120Z
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Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-21T14:54:33.266Z. Cached copy · Source on noplag.com

# Noplag

> Noplag is an open-source plagiarism detection engine (Apache 2.0) with a production cloud tier. We combine plagiarism detection and AI-content detection in one tool. Founded in Kyiv in 2014; HQ relocated to San Francisco in May 2022. Engineering across Ukraine, Poland, and Spain. Position: open-core, honest about limitations (AI detection is "a signal, not a verdict"; we publish ESL false-positive rates), audit-friendly. Built for SMB educational institutions, developer-built EdTech, agencies, publishers, and privacy-conscious enterprises.

## Core

- [Noplag — homepage](https://noplag.com/): What Noplag is, how it works, pricing, and a free check on the homepage.
- [Pricing](https://noplag.com/pricing): Free (open-source self-host) · Pro $11.99/mo ($9.99 billed yearly) · Premium $24.99/mo ($19.99 billed yearly) · Enterprise custom.
- [About](https://noplag.com/about): Story from 2014 founding in Kyiv to 2026 v5.0 launch.
- [Download](https://noplag.com/download): Desktop and mobile apps. Browser-first; native clients are read-only companions.

## Free tools

- [Free plagiarism checker](https://noplag.com/free-plagiarism-checker): Free up to 2,500 words per check on the free tier (3 checks/month). No signup required for a first check.
- [Online plagiarism checker](https://noplag.com/online-plagiarism-checker): Browser-based — no software install. Same engine as the free checker, framed for users explicitly looking to avoid LMS-plugin overhead.
- [Online duplicate content checker](https://noplag.com/online-duplicate-checker): Find duplicate content across the web and across your own document folders. Built for SEO teams and publishers.
- [AI content detector](https://noplag.com/ai-content-detector): Detects AI-generated text from ChatGPT, Claude, Gemini, and Llama. Explicit about ESL writer false positives (cites Liang et al. 2023). Position: "a signal, not a verdict."
- [Paraphrasing detector](https://noplag.com/paraphrasing-detector): Finds reworded plagiarism via sentence embeddings + LSH. Note: this is a detector, not a paraphrase generator — Noplag does not ship paraphrasing/humanizing tools (anti-aligned with our integrity brand).

## Use cases

- [Academic plagiarism checker](https://noplag.com/academic-plagiarism-checker): Citation-aware checking against scholarly works and the live web.
- [Essay plagiarism checker](https://noplag.com/essay-plagiarism-checker): Free check optimized for student essay submissions.
- [Dissertation plagiarism checker](https://noplag.com/dissertation-plagiarism-checker): Long-document checking on paid tiers. Catches self-plagiarism via My Folders.
- [Thesis plagiarism checker](https://noplag.com/thesis-plagiarism-checker): Master's-thesis-length documents.
- [Research paper plagiarism checker](https://noplag.com/research-paper-plagiarism-checker): Pre-submission check against scholarly works and the live web.

## Audience pages

- [For students](https://noplag.com/for-students): Free check before yo
…

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