Medium’s TK app puts an AI assistant inside the writing editor

Medium’s launch post lists built-in AI feedback on headlines and on editing, plus a check of a draft against a Medium publication’s style guide. TK also remembers past notes, turns them into writing prompts and summarises a topic into a wiki-style page. An MCP server (a standard way for AI agents to connect to other software) and a Claude skill let a writer’s own agent read what is stored there.

A published piece can carry a note setting out how AI was used in the writing. TK is free with a Medium account; TechCrunch says it runs on the web at launch with a desktop app planned, while Medium’s own post also lists a mobile app and mobile widgets. Drafts are not encrypted, since the app is built for sharing and feedback, though writers can set access permissions.

On our price sheet, checked on 10 November, Jasper’s Pro plan costs $69 a month per seat for marketing agents and two brand voices, and Copy.ai’s Chat plan costs $29 a month for five seats.

TK’s free feedback checks drafts against Medium publications’ style guides; neither source says it can learn a company’s own brand voice, which Jasper sells at $69 a seat with two Brand Voices.