According to TechCrunch, Medium has launched a writing app called TK, which embeds an AI assistant directly into the editor. Users can type "@TK" along with a prompt to get help. Medium stated that TK will offer features such as editing and headline feedback, as well as helping organize previously saved writing content. Authors can publish notes to disclose how AI was used during the writing process. Medium added that the tool will be provided for free to Medium account holders, rolling out first on the web version.