Castwyn
AI content enginePost everywhere. In your voice. On autopilot.
Castwyn turns a single idea into platform-native posts for every network, written in your voice and scheduled for when your audience shows up. LinkedIn, Bluesky, and Mastodon publish automatically; the rest are one-click copy & paste while each platform’s review is pending. Castwyn has a flat subscription; your own AI provider bills usage separately.
A preview before you sign up
Illustrative, hand-written examples. Not live AI output or posts from a customer.
Sample idea: Take a short walk after a long stretch of desk work.
A workday reflection
I used to wait until my work was finished to step outside. On busy days, that meant I never did. Now I put a short walk between two blocks of desk work. The work is still there when I get back, but I return with a clearer starting point. What helps you reset between tasks?
A concise observation
Desk-work reset: close the laptop, walk around the block, come back. No step goal. Just a change of scene before the next task.
A practical invitation
If you've been at your desk for a while, consider a short walk before you start the next thing. It doesn't need to be a workout or a productivity hack. A few minutes away from the screen can simply be a pause. What's your favorite low-effort way to take a break?
Ready to make your own? Start your 7-day trial. An AI key is needed to generate drafts; your provider bills usage separately.
One idea becomes seven distinct posts — each a different angle, written natively for its network rather than copy-pasted.
Set tone, style, cadence, and what to avoid for each platform. Castwyn adapts the idea instead of blasting the same text everywhere.
Schedule a week across every connected network and see it laid out. Edit, reschedule, or pause anything until the moment it publishes.
Verified engagement from the networks themselves on every plan — plus which network actually pays off per post and your best day, on Professional.
Upload once and attach images to any post. Publishes with alt text on LinkedIn, Bluesky, and Mastodon.
Connect your own OpenAI or Anthropic key. Your provider bills variable AI usage directly at its rates; Castwyn adds no AI credit markup.
Connect Castwyn to n8n, Make, curl, or Claude and generate, queue, schedule, and publish from anywhere.
Earn 30% of what everyone you refer pays, every month for their first year. Free to join.