# InkSpine vs Vellum Vellum formats a finished book; InkSpine also writes it. Compare platform support, worldbuilding, draft history and export. - - Published 9 July 2026 - Updated 3 November 2026 ## At a glance ### Choose Vellum if - you have a Mac and a finished draft to format ### Choose InkSpine if - you want to draft, plan and export from the same project ## Feature by feature | | 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 | > 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 (InkSpine Core) from the same cross-platform project. Writing on a PC? [Vellum for Windows](https://inkspine.app/vellum-for-windows) covers the version of this question where running Vellum isn’t an option at all. If you're formatting in one app and writing in another, come do both in one.