Viper is the plagiarism checker of choice! It scans over 10 billion resources, has an easy-to-use interface and highlights areas of plagiarism - totally free!
Platforms
- Windows
- Online
United Kingdom



Viper is the plagiarism checker of choice! It scans over 10 billion resources, has an easy-to-use interface and highlights areas of plagiarism - totally free!



APIs to view, convert, annotate, compare, sign, assemble, and search documents in your .NET or Java applications. Free 30-day trial.
AI-powered document comparison for legal teams that separates material changes from formatting noise and produces clean, export-ready redlines.

AI Lawyer is a legal platform that provides instant legal advice, document generation, document checking, document comparison, and legal research. Here are some of its key advantages:

Free AI-powered text and file comparison tool. Compare PDF, Word, Excel, JSON, YAML, CSV, XML and Markdown online. End-to-end encryption, real-time collaboration, AI explanations. No installation needed.



CompareDesk compares two or more versions of a document and reports every insertion, deletion and move. It handles DOCX, DOC, RTF, TXT, PDF and spreadsheets in XLSX, XLSM, XLS, ODS and CSV in any combination, including a PDF against a Word file and a scanned document against a...

Verso shows what changed between two versions of a text. Drop in the previous and the new version and read the differences side by side: words added in green, removed in red, and chapters or paragraphs that changed position marked as moved instead of deleted and rewritten.

