Noplag Engine vs Winston AI
Noplag Engine
github.com
Winston AI
gowinston.aiSide by side
| Figure | Noplag Engine | Winston AI |
|---|---|---|
| Price from | $9.99/mo | $5/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 4 | 8 |
| Spec score · Plagiarism Detection Software | 8.5 (#11) | 8.5 (#12) |
| API | The engine exposes a `/v1` API with checks, reports, uploads, progress events, and corpus management, and ships without authentication. | Winston offers developer APIs for AI detection, plagiarism detection, fact checking and AI image detection, with API-key authentication and published documentation. |
| Headquarters | San Francisco, United States | Montreal, Quebec, Canada |
| Integrations | The Enterprise plan lists Canvas, Moodle, and Blackboard LMS integrations; the features page also names Brightspace via LTI 1.3. | Official help pages list Google Classroom, WordPress and Chrome, Opera and Firefox browser extensions as integrations. |
| Languages | The hosted product says detection is calibrated for English, Spanish, Portuguese, Polish, and Ukrainian at launch. | AI text detection supports English, German, French, Dutch, Spanish, Portuguese, Italian, Polish, Indonesian, Tagalog, Chinese, Romanian, Russian, Ukrainian, Bulgarian and Azerbaijani. |
| Purpose | Noplag Engine is an open-source plagiarism detection engine for verbatim and near-verbatim matching against a corpus you control. | Winston AI detects AI-generated text and images and offers plagiarism checking and other content-integrity tools. |
| Reports | Reports include per-source similarity, matching passage offsets, and coverage accounting. | Users can generate downloadable, shareable reports, including printable PDF reports. |
Plans
Noplag Engine
- FreeFree
- Pro$9.99 a month
- Premium$19.99 a month
- EnterprisePriced on request
Winston AI
- FreeFree
- Essential$60 a year
- Advanced$96 a year
- Elite$156 a year
- Essential$189 a month
- Advanced$2,914.50 a month
- Elite$4,924.50 a month
- Enterprise and Custom PlansPriced on request
In their own words
Noplag Engine
Noplag Engine is an open-source plagiarism detection tool that checks text for verbatim and near-verbatim matches against a corpus you control. It uses winnowing fingerprints to find candidate sources, then aligns matching character ranges. Reports show similarity by source, passage offsets, and coverage accounting. It accepts.txt,.md,.pdf, and.docx files, with folder ingestion and HTTP uploads, and exposes a /v1 API for checks, reports, uploads, progress events, and corpus management. The API ships without authentication. The open-source engine searches a local corpus; the hosted product also searches the live web. It does not detect paraphrase, semantic similarity, or AI-written text. The engine can run on your own hardware with Docker Compose under the Apache 2.0 license. The repository lists Python 3.12 or newer for development and PostgreSQL in its Docker Compose setup. The free hosted plan costs nothing and allows 3 checks per month, while self-hosting permits unlimited local checks. Pro costs $9.99 a month and Premium costs $19.99 a month; Enterprise pricing is custom.
Winston AI
Winston AI checks text and images for AI-generated content and provides plagiarism checking and other content-integrity tools. Its detector identifies material from ChatGPT, Claude, Google Gemini, LLAMA, and other AI models. Users can paste text or upload DOCX, PNG, and JPG files; OCR extracts text from scans, pictures, and handwriting. An AI prediction map highlights passages and assesses text sentence by sentence, and reports can be downloaded or shared as printable PDFs. The homepage lists detection in 16 languages, including English, French, Spanish, German, Portuguese, Dutch, Polish, Italian, Romanian, Indonesian, Tagalog, Russian, Bulgarian, and simplified Chinese. Integration options include a Chrome extension, Google Classroom, WordPress, Zapier, and an API; the extension scans highlighted webpage text and images. Plans include a free option and a 14-day trial. Paid pricing starts at $10/mo billed annually; listed annual plans cost $60.00 USD, $96.00 USD, and $156 a year. Paid scans support up to 200,000 characters each. Annual subscriptions cannot be canceled during their term.