Be someone who posts on LinkedIn every week.

With your own ideas, in your own voice. Casper is the ghostwriter who interviews you and helps you write, and the coach who keeps you at it.

Join early accessSee how it helps

Casper works inside the AI agent you already use — Claude or ChatGPT — so there is no new tool to learn.

Turn what you know into what you’re known for.

The people who work with you know how much you understand. Everyone else — the next customer, the next employer, the colleague two departments away — only has what they can see.

People cannot value expertise they never get to see. The introductions, the invitations and the “I’ve been reading your posts” messages go to the person who is visible and remembered.

Casper helps you put what you know where people can see it, one post at a time.

Less staring at a blank page. More saying something only you could say.

01

Find the idea

Talk about a project, a mistake, a question customers keep asking, or something you changed your mind about. Casper asks the follow-up questions and makes sure nothing useful is lost.

02

Make it sound like you

Casper remembers how you explain things and learns from the edits you make before publishing. Each draft starts closer to your voice than the last, instead of sounding like a generic AI post.

03

Put it into the world

See the post exactly as it will look on LinkedIn, make the last changes on your phone, add an image if you want, then publish now or pick a time. Nothing goes out without your say.

The useful idea is often hidden in an ordinary sentence.

Casper notices it, and keeps it from disappearing.

Why I’m building Casper

A note from the founder

I built Casper because I kept meaning to post on LinkedIn and kept not doing it. Other work came first. When I finally sat down to write, nothing came out. And when something did, it felt too obvious to be worth saying.

More words would not have helped. I needed someone who remembered what I had already said, asked the next question, and expected me back the following week.

Casper is what I wanted beside me: part ghostwriter, part coach. Now I sit down once a week, talk through what I have been working on, and leave with the week’s posts. I publish three times a week, in my own voice.

— Rasmus

How it works

You decide when you want to post. Casper interviews you regularly, keeps every idea you have, and guides you from a rough thought to a finished post.

  1. You set a plan

    Pick the weekdays you want to post on. Casper lays out the coming weeks, so you can always see which days have a post, which have an idea waiting, and which are still open.

  2. Casper interviews you

    Once a week or once a month, whichever suits you, Casper asks about what you have been working on. It listens for the stories and opinions worth keeping, and steers toward the topics where you have the least to draw on.

  3. Ideas go in whenever they turn up

    A thought on the train, an article, a question from a customer. Say it in a conversation or send it by email, and it is waiting in your list of ideas the next time you sit down.

  4. Ideas become posts

    In a writing session, Casper suggests the idea for your next posting day, asks what is still missing, and drafts the post in your voice. You make the last edits and decide when it goes out.

  5. You learn what works

    Casper connects to your LinkedIn posts and collects the numbers for each one. It helps you see what landed, what didn’t and why, so your next posts build on evidence instead of guesses.

  6. Casper keeps you at it

    You hear from Casper when a session is due, the evening before a posting day, and once a week with a summary of what you published. Each draft also teaches it more about how you write.

You should never have to start from an empty text box.

No more opening LinkedIn and looking at the empty box where a post should go. Casper opens every session with what you know, how you sound and where you left off. Each conversation starts further along than the last.

I

What you know

Your experience, stories, opinions, goals, half-formed ideas, and the subjects you want people to associate with your name.

II

How you sound

The words you choose, how direct you are, what feels natural to you, and the changes you keep making before you publish.

III

Where you left off

Ideas worth returning to, unfinished drafts, what you published recently, and the next useful piece of work waiting for you.

One good post gets attention. Posting every week makes you known.

One isolated post

“That was useful.”

A good idea gets a moment. Then the feed moves on, and the reader has little reason to remember who said it.

The same voice, week after week

“This is a person who understands that problem.”

Related stories, lessons and opinions, said week after week, build a clear impression of what you know. That impression is what brings trust, introductions and new opportunities.

At first it feels like shouting into the void.

You post, a handful of people react, and the feed moves on. It is easy to decide that nobody is listening.

They are. Most of the people you want to reach read without reacting, and it often takes ten or more of your posts before someone remembers who you are and what you know.

That is why posting every week matters more than any single post.

Casper’s coaching is there to make that part easier. It has an idea ready when you sit down, reminds you when a posting day is coming, and shows you each week that you kept going.

Casper is for people who are valued for what they know and who they are.

Founders

You learn something every week about products, customers, teams and markets. Casper helps turn those lessons into a visible point of view.

Consultants and advisers

Your expertise is clearest inside client work. Casper helps future clients understand your value before the first call.

Experienced specialists

You have years of useful knowledge and no wish to become a full-time creator. Casper makes sharing it a smaller, calmer part of the week.

Casper is probably not for you if you want viral tricks, templates, dozens of company posts a week, or an AI that publishes without asking. It is built for thoughtful personal writing that stays under your control.

Common questions

Do I have to learn a new AI tool?

No. Casper works inside Claude or ChatGPT, so you keep the chat you already use. It brings what it knows about you and its way of working into every conversation, which is how it picks up where you left off.

Which agents and plans does it work with?

Claude on any plan, including the free one. ChatGPT currently needs a Business, Enterprise or Edu workspace, because that is where ChatGPT allows connectors that can save your work.

How do I get started?

Create an account, connect Casper to your agent, and have a first conversation of about ten minutes about who you are, what you know and who you want to reach. Everything is saved as you go, so you can stop and pick it up later.

What if I don’t know what to write about?

That is one of the main reasons Casper exists. Start with something that happened at work, a problem you solved, or a belief that changed. The right questions usually reveal a useful, specific post. You can also send an idea by email the moment one turns up.

Will the posts sound like AI?

The aim is the opposite. Casper learns from your real writing and from the edits you make. You stay the final editor, and nothing is published without your approval.

Does Casper publish without asking?

No. Saving ideas and drafts happens quietly. Publishing or scheduling always needs your approval — your name is on the work.

How much time does it take?

A short conversation can find and shape an idea. Reviewing and publishing happens later from your phone. Casper also reminds you when your next session is due, so it fits inside a normal week.

What if an idea turns up between sessions?

Email it to your personal Casper address, or forward the article or thread that set it off. One email can become several ideas, and you get a reply confirming what was saved. Attachments are not kept yet.

Can I set a posting schedule?

Yes. Pick the weekdays you want to post on. Casper lays out the coming weeks and shows which days already have an idea or a draft and which are still empty. You can move or skip a day whenever you need to.

Will it keep me on track?

That is the point. You get an email when your writing session is due, a reminder the evening before a posting day (with ideas from your backlog if the day is still empty), and a weekly summary of what you published and what comes next. Each one can be switched off.

What if I miss a week?

Nothing breaks. Your ideas, drafts and plan are where you left them, and the next session opens with what you were working on and what is due.

Does it post to LinkedIn for me?

If you want it to. Connect LinkedIn once, then publish straight away or pick a time. A scheduled post stays editable, and you can move it or pull it back to a draft. You can also copy the text and post it yourself.

Can I do this from my phone?

Yes. Reviewing, editing, adding an image and publishing all work on a phone, with a preview that shows the post as it will look in the LinkedIn feed.

Can I see how my posts are doing?

Casper collects the LinkedIn numbers for each published post, shows them post by post and over the last 30 days, and includes them in your weekly summary.

Can I see what Casper knows about me?

Yes. Your profile, your topics and what Casper has learned from your edits are all on one page, and you can change any of it. Casper asks before it changes what you have already written there.

Which languages does it work in?

It is especially tuned for English, Finnish and Swedish.

What happens to my data?

Your ideas, drafts and profile are stored securely and stay yours. You can export or delete all of it at any time.

Start posting what you know, consistently.

No spam, no launch-date promises. One note when your seat is ready.