Grammar Checker API
Empower error-free writing with the most accurate grammar checker available, a fully flexible API that effortlessly integrates into native platforms with a single line of code.
It’s More Than Just Another Grammar Checker
Enhance your content creation process with the most accurate suggestions for 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.
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.
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.
Coming Soon
Say More With
Multi-Language Support
While most grammar checkers only support English, the Copyleaks Grammar Checker API offers multi-language support, including German, Spanish, French, Italian, and Portuguese.
A Fully Flexible API Built By Developers for Developers
Grammar Checker API is even better when paired.
Each of our dynamic product offerings is strong on its own. However, they are truly powerful when you use them together.
Accuracy is based on the BLEU score. Click here to view the results.
English 
Arabic 
Chinese 
French 
German 
Hindi 
Italian 
Japanese 
Russian 
Spanish 
Turkish 
Portuguese