Medium's New TK App Is an AI Writing Coach, Not a Ghostwriter
Medium's new TK app offers a private, AI-powered notebook that acts as a writing coach to help you refine ideas, not replace your own voice.
The short version
Medium just released a new app called TK, which is a private notebook with a built-in AI assistant. The app is not another AI ghostwriter; it acts more like a coach, helping you organize thoughts and improve your own drafts. TK is for writers who want some help from AI without sacrificing their own voice and ideas.
What is Medium’s TK app, really?
Medium’s new app, TK, is now open to the public after a period of being invite-only. You can use it right now if you have a Medium account, and it’s free. The name TK is a little inside baseball—it stands for “to come,” a placeholder journalists use in drafts for information they’ll add later. That name tells you a lot about the app’s purpose. It’s designed as a home for your unfinished thoughts, your messy first drafts, and your fleeting ideas.
At its core, TK is a simple, private notebook. It’s a clean, quiet space for you to write things down. But hidden inside is an AI assistant, and that’s where things get interesting. Unlike many AI tools that offer to write entire articles for you from a single prompt, TK’s AI is built to be a partner. A collaborator. It’s a tool made for the process of writing, not just the final product.
Why is another notes app a big deal?
The arrival of another notes app isn’t normally front-page news. I have dozens. You probably do, too. The significance of TK comes from the specific problem it’s trying to solve. A recent Medium survey found that while 71% of writers use AI tools in their work, a majority of those same writers distrust AI-generated writing, including their own. Think about that for a second. We use it, but we don’t trust it.
The conflict between utility and authenticity is the central tension for writers today. The distinction between an AI coach and an AI writer matters because of that trust issue. We want help with the tedious parts—the outlining, the headline brainstorming, the search for a better word—but we recoil at the idea of an algorithm faking the human spark that makes writing worthwhile. It feels like cheating, and readers can often smell it from a mile away.
Medium’s TK app feels like a direct answer to that problem of writer distrust in AI. The company is betting that there’s a huge group of writers and creators who are AI-curious but also deeply skeptical. They want tools that augment their own intelligence, not replace it. TK is built on the philosophy of assistance, not automation. It’s a subtle but profound difference. It doesn’t want to be your ghostwriter; it wants to be the smart, encouraging friend reading over your shoulder and offering gentle suggestions.
How does the AI assistant actually work?
This is all philosophical, but what does TK actually do? The features are designed to be specific interventions in the writing process, not a big red “write it for me” button. Let’s walk through a real-world scenario. My scenario.
I just got out of a pointless two-hour meeting that could have been an email. I’m annoyed. But I also feel a blog post brewing about corporate productivity theater. I open TK on my phone and dump my raw thoughts into a new note:
”two hours. for what. gary repeated the same point three times. the slide deck was literally from last quarter. no decision was made. just ‘aligning.’ what does that even mean. everyone looked so tired. my coffee got cold. i could have been writing this whole time.”
It’s a mess. Just a pure, unfiltered braindump. This is where TK’s AI tools come into play.
The first tool I might try is Spark. It’s meant to ignite new ideas from your existing notes. I tap it, and it gives me a few creative prompts based on my rant. It might suggest things like: “What was the one thing that could have saved this meeting?” or “Write a short story from the perspective of your cold coffee cup.” The second one is weird, but it’s also a creative jolt. It forces me to think differently. A fun exercise.
Let’s say I ignore the coffee cup and try to turn my notes into a more coherent paragraph:
”The meeting was a two-hour waste of time that should have been an email. Gary said the same thing over and over, and the slides were old. We didn’t decide anything, just talked about ‘alignment.’ It’s frustrating because I could have used that time to do actual work.”
It’s okay. A bit flat. Now I can use the Strengthen feature. This is TK’s version of a developmental editor. I highlight the paragraph and ask the AI for feedback. It doesn’t rewrite it for me. Instead, it offers observations. The recent report on TK’s public launch mentions this coaching aspect specifically. The AI might tell me my main point is clear but could be made more powerful with a specific anecdote. It could suggest I use stronger verbs than “was” and “said.” It correctly identified that my tone was frustrated but also a bit observational, and suggested I lean into one or the other for more impact.
Armed with that feedback, I might revise the paragraph. Then I need a title. I use Suggest Headlines. TK’s AI spits out a handful of options based on the content:
- The Meeting That Should Have Been a Memo
- In Loving Memory of My Wasted Afternoon
- How to Survive Corporate ‘Alignment’ Culture
- Your Guide to Spotting a Pointless Meeting
These are pretty good. They’re certainly better than my first thought, which was probably just “Meetings Are Bad.” The last tool is Tag My Notes. I tap it, and the AI scans the text, suggesting tags like #productivity, #meetings, #corporate, and #writing. With one click, my messy note is now organized and findable for later.
That whole process is the core of TK. It’s a series of small, helpful nudges that keep me, the writer, in complete control.
What’s the bigger picture for Medium?
Launching a simple notes app might seem like a small move, but TK is a strategic play for Medium. The platform’s entire value proposition rests on the quality and authenticity of human writing. The biggest existential threat to a platform like Medium is a tidal wave of low-quality, AI-generated content that drowns out human voices and devalues the craft of writing itself.
By building a tool that helps human writers do their best work, Medium is planting a flag. They are actively choosing a side in the debate over AI’s role in creativity. Their side is augmentation. They are building a moat around their core asset—real writers. This strategy also aligns with their other recent initiatives, like creating policies to identify AI-generated stories on the platform. They are trying to create a trusted ecosystem.
Furthermore, TK is a tool for retention and engagement. It captures the writer at the very beginning of their creative process—the messy idea phase. If writers start their journey in TK and find it useful, they are more likely to stay within the Medium ecosystem when it comes time to publish. It connects the very first spark of an idea to the final published article, all under one roof. It is a smart, defensive move against a world of generic content and a strong, offensive move to give their core user base better tools.
So, should you use TK?
Now for the practical question. Is this app worth adding to your already crowded phone screen? My answer is a firm “maybe.” It depends entirely on who you are and what you need.
You should absolutely try TK if you are already a writer on Medium. It’s a free, integrated tool designed for you. You should also try it if you’re a writer who has been curious about using AI but put off by the soulless, robotic output of most generative tools. If you want a private, secure place for your thoughts that offers helpful nudges without taking the pen out of your hand, TK is one of the most interesting options out there right now.
However, you can probably skip TK if you already have a sophisticated note-taking system that you love. If you’re a power user of Obsidian, Notion, or even just a well-organized Apple Notes setup, TK might feel a little too simple. Its strength is its focus, but that focus means it lacks the power features of other systems. And if you are looking for an AI that can write a full first draft for you to edit, this isn’t it. You’d be better off with other AI assistants.
Ultimately, I think the value of TK is in its philosophy. In an industry rushing to automate human expression, Medium has built a tool that respects the writer. It’s a tool, not an oracle. A coach, not a ghostwriter. And that’s a refreshing perspective that might be worth your time.
FAQ
Is the Medium TK app free? Yes, the TK app is free to use for anyone with a Medium account. Your notes are stored and synced through your account.
Does Medium train its AI on my private notes in TK? No. Medium has stated that TK is a private space. The contents of your notes are not used to train their AI models, and nobody at Medium can view them.
Can I publish my notes directly from TK to Medium? Not at the moment. Currently, you have to copy and paste your work from TK into the Medium editor. However, given the integration, it seems very likely that a direct “publish to Medium” feature will be added in the future.
How is TK different from just using ChatGPT for writing help? The main differences are privacy and focus. TK is designed as a secure, private notebook. Its AI features are also specifically tailored for the writing process—like offering prompts, feedback, and headlines—rather than being a general-purpose chatbot that can do anything.