I have contacted with one of the top online plagiarism checker company name CopyScape, they replied me back with their pricing details. It could be give you an idea about a pricing of plagiarism checker.
Hello xxx,
Thank you for your interest in our product. We are happy to be of assistance.
Our Copyscape Premium service enables you to perform manual,
one time searches for copies of your content. Once you open up an account,
which we see you have already done, you will need to buy some search credits.
There is a minimum purchase of $5.00,
when paying by credit card or US $10.00
when paying via PayPal. You can submit a URL or a portion of text to be checked
for which you are charged $0.03 for up to 200
words checked and an additional $0.01, for each additional 1-100
words checked. There are no other charges involved.
The easiest way to calculate the cost of a search is to
round up the amount of words to the nearest hundred, and then divide that value
by 10,000 and add 0.01.
For example if you have a portion of content that has 445
words, round it up to the next 100, i.e. 500, then divide that by 10,000
and add 0.01= $0.06.
Although we do not support checking the contents of files of
any type, you could use our API
in conjunction with another service/utility that you will have to find, that can
extract the text from a
Word document and then pass it along to our API to be checked.
Our API
allows you and/or your developers to seamlessly integrate
Copyscape Premium into your Content Management System, enabling you to
automatically check the originality of content as it is newly submitted. It can
also be used to run through portions of text or a list URLs, receiving results
in XML or HTML format instantly.
You and/or your web developers can look through our very simple Copyscape API
guide to familiarize yourselves with its technical functions and capabilities:
If it is useful, we also have sample code in various coding languages that you
can use, i.e.PHP, Python, Ruby, Java, Perl, Coldfusion or these
flavours
of
ASP.NET: C#, Visual Basic, C#
(Razor syntax), VB (Razor syntax).
Here is the direct link to the sample code section within our
API
guide:
For more information about Copyscape Premium, please see:
You may also find the Brochure helpful:
You can sign up here for a
Copyscape Premium account: