Empower your writing with the most accurate tool for grammar corrections, sentence structure, tone suggestions, overall mechanics, and more.

It’s More Than Just Another Grammar Checker

Enhance your content creation process with the Copyleaks Writing Assistant, the market’s most accurate solution for improving sentence structure, word choice, overall mechanics, spelling, and more.

Combined with the award-winning AI Content Detector API and Plagiarism Detector API, it’s the only comprehensive offering dedicated to creating original, error-free writing.

Think of It As Your
Personal Proofreader

Keep your writing concise and fresh with sentence structure tips that help prevent run-ons, fragments, and more. Plus, word choice suggestions align your vocabulary with the intended audience and identify potentially misused words and homophones. 

Personal Proof reader

Write With
Absolute Confidence

Get notifications identifying potential writing mechanic errors, including spelling mistakes, comma errors, and more. Also, be alerted to conjunction errors, subject-verb disagreements, misused prepositions, and everything in between.

Grammar Error text breakdown
Writing Assistant with AI and Plagiarism Detector

Be Original and
Fully Transparent 

When integrated alongside the AI Content and Plagiarism Detector, you have the only solution that fully empowers the creation of original, error-free writing and offers complete content transparency.

Say More With
Multi-Language Support

While most writing tools only support English, the Copyleaks Writing Assistant offers multi-language support, including German, Spanish, French, Italian, and Portuguese.

Multi Language support
Copyleaks Grammar score breakdown of corrections, insights, and readability

Get Full Insight With the Grammar Score

The Grammar Score is an overall assessment of a submitted text, configured based on three components.

  1. Corrections: This encompasses suggestions for grammar, mechanics, sentence structure, and word choice.

  2. Insights: A breakdown of average word and sentence length, number of sentences, reading time, and more.

  3. Readability: Determines how easy content is to read and provides historical data, allowing easy comparison against prior submissions.
Node JS

A Fully Flexible API Built By Developers for Developers

The Grammar Checker API was built with the developer in mind. It’s fully customizable and supports key programming languages, including C#, Node.JS, PHP, Java, Ruby, Python, and more.