The AI that runs the back office of the company you own.
It joins your calls, chases your invoices, keeps the books and remembers every promise. It asks before it acts, and everything it makes is yours.
Castan reads the public pages only, and keeps nothing past a day.
Harbor Leather owes $4,200 on invoice 118, due 12 days ago. On the call last Tuesday you promised the revised samples by Friday.
Alder Roasters has $1,850 open since 29 September; nothing promised.
Decided: the 400-unit order ships in November, delivery by the 20th.
It joins the call, and the recap reaches everyone on it.
Meet, Zoom or Teams. Two minutes after the call ends, everyone on it has the decisions and the promises, and the call is part of what the company remembers.
Hi Dana, a quick note on invoice 118 ($4,200), due on 30 September. You mentioned on Tuesday that the revised samples were the blocker; they ship Friday. Could you release the payment this week?
It writes the reminder from the invoice and the last thing the customer said.
Then it waits for you. Send it, change it or hold it, in one press.
In: $18,400 from three invoices. The two open ones are chased.
This week: the samples ship Friday; the Canada terms and the carrier quote are still open.
Every Monday, the review: what moved, what slipped, what to do next.
Written from your invoices, calls and mail, with the first thing to do drafted and waiting.
A week in a company Castan runs with you.
Each stop is a real screen. Scroll sideways.
Hi Dana, a quick note on invoice 118, due on 30 September. You mentioned on Tuesday that the revised samples were the blocker; they ship Friday.
Flat per company. Never per seat. Free to start.
Every plan has the whole product. Plans differ by the people and the hours included, never by features.
The first 20 customers pay $199/mo for life, applied automatically at checkout. Twenty in total, then the price is gone for good.
Start on GrowthQuestions people ask before they start
What does Castan do on the first day?
You connect one source, Gmail, Google Calendar, Slack, GitHub or Stripe, and ask the first question within minutes. Send it to your next call and everyone on it gets the recap. From there it chases the invoices, keeps the books and remembers every promise.
Does it act on its own?
It proposes. A reminder, a reply, a commit: anything that leaves the company waits for your approval, one button. Custom agents run on their schedule and put what they want to do in front of you the same way.
What can it read, and can it send mail as me?
The connections are read-only: Gmail and Calendar through Google’s read-only scopes, Stripe through a restricted read key. Castan sends only its own mail: meeting recaps, invitations, its notices to you, and an invoice reminder once you approve it.
Who owns what it makes?
You do. The website, the code, the customers, the data. Studio writes into a GitHub repository you own, as pull requests you review, and you can take the code anywhere.
What does it cost?
One flat price per company, never per seat. Free to start, with no card. Founding is $29 a month, Growth $299, and the first twenty customers pay $199 a month for Growth, for life.
What is in the free plan?
Up to 3 people, 2 connected sources with the last 200 items of each, one meeting hour a month, 12 questions a day and one website build. Allowances may change; the pricing page always shows the current ones.
Which calls can it join?
Google Meet, Zoom and Microsoft Teams. With your calendar connected it joins from the invitation, and two minutes after the call ends everyone on it has the decisions and the promises.
Where is my data, and who can see it?
On servers in the European Union, encrypted in transit and at rest, each workspace isolated from every other: a query without your workspace returns nothing. Connection tokens are encrypted again at the application layer. Card details go to Stripe and never touch our servers.
Do I need to be technical?
You describe the company in a sentence. Castan drafts the definition, reads the odds, starts the website and asks before anything goes out. A developer on your side can take the code at any time.
Can I stop whenever I want?
Yes, any time, from Settings. What you built and what Castan remembers stay yours.
Connect one source. Ask the first question in minutes.
No card. Google or email sign-in.
What shipped and what the numbers did, once or twice a month.