From email applications to college essays — sometimes, spelling and punctuation really matter. Grammarly is a neat writing app and browser plugin that catches errors as you type. It can even detect plagiarism. Right now, one year of Grammarly Premium service is just $69.99 (Orig. $140) at 9to5Toys Specials with coupon code: GRAMMARLY10

Just like your old English teacher, Grammarly underlines errors in your writing. The app catches spelling mistakes, erroneous punctuation, and poor grammar. But unlike Word, Grammarly won’t misunderstand what you’re trying to say.

The app also looks for contextual errors, and you can turn on genre-specific writing style checks. As an added bonus for students, Grammarly checks your work against 8 billion web pages in order to detect plagiarism. With over 400 checks in total, you get complete cover.

Grammarly works across all major desktop and mobile platforms. This means you can write anywhere and still have your work checked. Along with the main app, you can install the web browser extension. This provides all the same checks while you’re writing in Gmail or composing tweets.

It’s normally $140, but one year of Grammarly Premium service is now only $69.99 with coupon code: GRAMMARLY10.