Grammarbase is described as 'Online grammar checker. You don't need to pay us, register or complete any test - you just copy-paste your text and see your grammar mistakes. Easy as pie!'. There are more than 10 alternatives to Grammarbase, not only websites but also apps for a variety of platforms, including Mac, Windows, Google Chrome and Microsoft Office Word. The best alternative is Grammarly, which is free. Other great sites and apps similar to Grammarbase are Hemingway Editor (Paid), Ludwig.guru (Freemium), Slick Write (Free) and ProWritingAid (Freemium).
Expresso is a little tool to edit texts and improve your writing style. It will teach you to express yourself through writing more efficiently and help make your texts more readable, precise, and engaging. Expresso is built on top of Python Natural Language Toolkit package.