We use a proprietary conglomeration of computer algorithms. It has not yet been given an official name, but it is affectionately known as Grendel. We do not offer human editing services; our service is 100% automated.

PaperRater.com does not distribute your papers to any plagiarism detection services, nor does our own plagiarism detection rely on past submissions.

The estimated grade is the result of many factors including word choice, spelling, grammar, and more. The other feedback given by our service should provide you with clues as to how to improve your grade. Please note that the auto-grader is not able to analyze your ideas, how well you support your main points, the logic of your statements, the organization of your text, and more. Scores on creative writing do not always transfer as well due to the computer's inability to evaluate analogies and other clever constructs. Any more information on this would require discussion of statistics, machine learning, and natural language processing...(Exciting to us, but not to most people)

We are focused primarily on growth at this point (we are a startup), but we offer a premium membership for those interested in more features. Costs are also offset by the ads that you may have noticed on some pages of our site.

Not at this time. If you think this is a good idea, suggest it using the Feedback tab on the right side of this page.

No. This is a web-based service -- you do NOT download anything. All processing takes place on our server and the results are displayed in your browser.

YES. We will ALWAYS have a free service, with mostly the same features that it has now. In the future, we plan on providing premium services that offer additional enhancements.

There are a few possible reasons for this. PaperRater looks for common errors, and your mistake may not be one that it recognizes. In addition, PaperRater only suggests changes when its statistical models are confident that there is a problem, so that users aren't presented with many "false positives". We don't want to mention any names, but we have found other popular grammar checkers to be wrong in 25-45% of the instances they flag.

We do our best to minimize these instances of "false positives", but our software and statistical models are not perfect. You can email us the sentence in question along with the message, and this info will help to improve our system.

Ouch, that hurts. Grendel (our automated proofreading software) attempts to find the best correction using techniques available to computers. He lacks the full contextual understanding of a human and is semantically-challenged. To help Grendel improve, please email us the problem sentence and the bad suggestion.

Most teachers would like students' grades to reflect the standards set forth by that particular teacher for that particular class. For example, a high school may have three different writing levels (and classes) within the same grade level (e.g., Senior). Even if each class has the same teacher, he/she would grade each class differently. For example, an AP English class would not be graded the same as a basic level classroom. In addition, it's important to note that the automated grader does not take into account all features of the text. Evaluating the organization of the text and the arguments made is still something that we leave up to the teacher.

As much as we are sorry for your loss, we cannot assist with these requests.

We allow about 5 pages at roughly 300 words/page for our free service. We have a premium service at https://www.PaperRater.com/pricing that allows up to 15-20 pages. If we go higher than that, Grendel can't fully digest your submission (he gets indigestion). Of course, if your paper exceeds the limit, you are welcome to split it up into multiple submissions.

You can easily cancel at anytime and your membership will continue to work prior to your next billing cycle. To do so, simply login, click on the "Account" link in the upper right corner of the member home page. You will then be able to cancel your membership.

The free plagiarism check does not identify any unoriginal parts. The premium service will show unoriginal text from the phrases that it samples along with the matching Internet source.

We reserve the right to terminate accounts that appear to be using automated techniques or sharing accounts. Please see our pricing page for specific limits. As of now, these limits are "soft" limits, so slightly exceeding them in a given month will not incur additional charges.

Although Grendel was born and raised in the United States, he will accept either.

This is an automated service, so the analysis is produced in real-time. It's unusual for you to wait more than one minute, and usually much less than that.

No, our service requires computing resources beyond the average PC and requires Internet connectivity.

The results page includes a printable report link. Depending on your computer or device, you may be able to print this to a PDF file.

We recommend making changes in your editor rather than through PaperRater as the original formatting can be modified.