Viper is packed with brilliant features in order to provide a plagiarism scanning experience like no other. With incredible access to billions of sources, an easy-to-use interface and a comprehensive report on each scan, find out how Viper could save you from embarrassing unintentional plagiarism.

Screen recording of Viper app
A screenshot showing a scan overview

Check against 10 billion+ sources

Viper checks against 10 billion sources, scouring books, papers and journals across the web to find matches with your work.

Your detailed plagiarism report lists every source matched to your document, with links for easy access.

Amazing quality and fast scan speed

With no queues or delays, you’ll be experiencing our lightning fast scanning in no time.

A screenshot showing a document scanning
A screenshot showing a plagiarism report

Downloadable plagiarism report

Download and take your plagiarism report with you wherever you go. Easy to send to your teachers or friends.


I would definitely, without a doubt, recommend this software, as it has made checking my work so accurate, convenient and quick.

Amber Osman

Viper has protected me through my first two years of college!

Eileen Taylor

A user-friendly, reliable, and regular resource for evaluating student papers.

Dr. Gregory D. Stephens

I can vouch for the fact that Viper's plagiarism scanner is the best plagiarism tool I've ever used.

Michael More

Whats the difference between free and premium scanning?

Viper Premium comes with additional features and benefits to deliver an even better plagiarism checking experience.

Features Premium Free
Scan Limits Unlimited* 1 per week**
Checks against 10 billion sources check check
Downloadable plagiarism report check check
List of individually matched texts check check
Dedicated customer support check (includes live chat) check
Improved scan quality check close
Faster scan speed check close
Ad-free browsing check close
Work is never published online check close
Delete work and scans check close

* You may purchase as many credits as you wish and undertake as many scans as you like.

** Free checks are limited to 1 per week, for work up to 5,000 words in length.