Great typesetting. Nowhere to write.

Vellum makes a finished manuscript look like a real book — but it has no opinion about how you got a finished manuscript, and it only runs on a Mac. InkSpine writes, plots, and exports a validated EPUB and DOCX from the same cross-platform project.

Where writers get stuck	Vellum	InkSpine
What it actually is	A formatting and export tool — you draft the book somewhere else first, then bring it in to typeset	Draft, plan, and export from the same project — nothing to import
Platform	Mac only	Windows, macOS, and Linux
Writing the manuscript	Not part of it — Vellum starts after the draft is already finished	A distraction-free markdown editor is the starting point, not a later step
Characters & locations	No worldbuilding features — it is a typesetting step, not a writing tool	Structured, linked worldbuilding beside the manuscript
Draft history	Relies on macOS's own file versions, not a project-specific history	Automatic git-based snapshots of the whole project as you write

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