Simple, pay-as-you go pricing.

No complicated subscriptions or monthly payments. Just buy the credits you need, when you need them.

1 credits


Half price


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3 credits


Half price


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5 credits


Half price


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10 credits


Half price


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20 credits


Half price


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50 credits


Half price


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What does a credit cover?

One credit covers a single document of up to approximately 5,000 words (30,000 characters). Documents larger than this will require multiple credits – e.g. a single document of up to 15,000 words would require 3 credits; two documents up to 5,000 words each would require 2 credits.

What if I've submitted my paper to a plagiarism scanner (i.e. Turnitin) already?

Viper does not connect with other plagiarism scanners or Turnitin's database, meaning your work won't be matched against any previous scans you might have made. Your scanned work is also never submitted to other databases, so your results are entirely private to you.

Can I get a refund?

Of course! We're happy to refund you for unused credits if you decide you don't want to use them. Just contact our support team to request a refund.

I'm an educational provider/enterprise user. Can I get any discounts or buy larger bundles?

We can offer custom bundles of credits for business users or educational institutions such as universities, colleges and schools. We'll work with you to create a package that suits your needs. To discuss your needs further and enquire about a bundle, please send an email to [email protected]

Get more information in our billing support section