Copy.ai

ProWritingAid is a grammar checker and style editor aimed at authors and long-form writers. It analyzes writing for readability, repetition, and structure with detailed reports. It was founded by Chris Banks in 2013.

Lex is a collaborative document editor with embedded AI for copy editing, brainstorming, and writing feedback, built for serious writers. It was created in 2022 by Product Hunt and Substack co-founder Nathan Baschez.

iA Writer is a focused, distraction-free Markdown editor available on Mac, Windows, iPhone, and iPad, emphasizing plain text and total focus. It is made by the design studio iA (Information Architects).

Bear is a Markdown note-taking and writing app for Apple devices known for its clean design, tagging, and cross-device sync. It is built by the Italian indie studio Shiny Frog and won an Apple Design Award.