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Where you write
Two Ways to Use GhostAI
GhostAI is available either as a one-time purchase of the GhostAI Plugin for Claude Code or Codex (with free lifetime updates), or it is available inside the Leanpub editor (for Visual or Source mode) with a subscription to a Max or Ultra Author Membership.
GhostAI in the Leanpub Editor
GhostAI is built directly into the Leanpub editor — both the Source editor and the visual editor. Open the GhostAI panel while editing any chapter, pick a skill, and start writing — no setup, no API key, no installation. The same skills, the same voice profiling, the same manuscript-aware intelligence, running right alongside your text.
The on-platform experience is designed for authors who want the power of GhostAI without leaving their writing environment. Changes are applied directly to your manuscript with automatic before-and-after snapshots, so you can always roll back. Every suggested edit is a proposal you accept or reject — nothing is auto-applied unless you turn that on.
GhostAI Plugin
The GhostAI Plugin is a set of skills you install into Claude Code or Codex. The GhostAI Plugin is available as a standalone purchase, and is also included in Book Weekend. Run the install script, and every skill works on any Markua manuscript — whether it's a Leanpub book or not.
The GhostAI Plugin works with your existing Claude Code or Codex account. The only usage charges with the GhostAI Plugin are what you get charged by Anthropic for Claude Code, or OpenAI for Codex. So if you're on a monthly subscription and stay under your usage limit, it's included.
The GhostAI Plugin is ideal for authors who live in Claude Code or Codex all day, and are happy editing files on their computer. Frankly, if you're a software developer who loves Claude Code or Codex, the GhostAI Plugin is the best experience for you. If you're writing with GhostAI on your computer, then our recommendation is to have your book in GitHub writing mode. Dropbox writing mode also works.
Earn $8 on a $10 Purchase, and $16 on a $20 Purchase
We pay 80% royalties on purchases of $7.99 or more, and 80% royalties minus a 50 cent flat fee on purchases between $0.99 and $7.98. You earn $8 on a $10 sale, and $16 on a $20 sale. So, if we sell 5000 non-refunded copies of your book for $20, you'll earn $80,000.
(Yes, some authors have already earned much more than that on Leanpub.)
In fact, authors have earned over $15 million writing, publishing and selling on Leanpub.
Learn more about writing on Leanpub
Write and Publish on Leanpub
You can use Leanpub to easily write, publish and sell in-progress and completed ebooks and online courses!
Leanpub is a powerful platform for serious authors, combining a simple, elegant writing and publishing workflow with a store focused on selling in-progress ebooks.
Leanpub is a magical typewriter for authors: just write in plain text, and to publish your ebook, just click a button. (Or, if you are producing your ebook your own way, you can even upload your own PDF and/or EPUB files and then publish with one click!) It really is that easy.