Vellum and Atticus are the two most discussed book formatting tools in indie publishing. Every author forum, Facebook group, and Reddit thread about formatting eventually comes down to this question: which one should you use?
The answer depends on your platform, your priorities, and what you’re willing to accept as trade-offs. This comparison is designed to give you the full picture — not to sell you on either tool, but to help you make an informed choice.
The short version
Vellum ($250, Mac only) produces the best book interiors in indie publishing. It’s rock-solid, fast, and does one thing exceptionally well. It has no writing editor and no Windows version.
Atticus ($147, cross-platform) combines writing and formatting in one tool that runs everywhere. It’s more affordable, more feature-rich on paper, and accessible to Windows authors. But it’s cloud-dependent, and authors have reported reliability issues that matter.
If you have a Mac and care most about output quality, Vellum. If you’re on Windows and need a formatting tool, Atticus is the most common recommendation. But both tools have real limitations, and this comparison will walk through all of them.
Pricing
| Vellum | Atticus | |
|---|---|---|
| Ebook + Print | $249.99 | $147 |
| Ebook only | $199.99 | N/A (one tier) |
| Subscription | No | No |
| Unlimited exports | Yes | Yes |
Both are one-time purchases. No subscriptions, no per-book fees. Vellum costs about $100 more than Atticus, which is significant for a single purchase but less meaningful when amortized across a publishing career.
At 10 books, Vellum costs $25/book. Atticus costs $14.70/book. At 25 books, Vellum is $10/book and Atticus is $5.88/book. If you’re publishing regularly, the price difference between them shrinks to a few dollars per title.
The real pricing question isn’t “$147 vs $250.” It’s “what do I get for the extra $100?” The answer is primarily output quality and reliability — which we’ll cover below.
Platform support
Vellum: Mac only. Always has been, always will be. The developers have stated publicly that a Windows version is not coming. If you’re on Windows, Vellum is not an option. Period.
Atticus: Windows, Mac, Linux, and Chromebook. This is Atticus’s single biggest advantage and the reason it became the default recommendation for non-Mac authors. It runs everywhere.
However, the way Atticus achieves cross-platform support matters. Atticus is architecturally a web application wrapped in a desktop shell. It uses web technologies (HTML, CSS, JavaScript) rendered in an embedded browser window. This is the same approach used by apps like Slack and VS Code. It works, but it has consequences for performance and file storage that we’ll address below.
Vellum is a native Mac application. It’s built specifically for macOS using Apple’s development frameworks. This is why it’s fast, why it feels polished, and why it can’t run on Windows.
Architecture: local vs cloud
This is the most important technical difference between the two tools, and it affects everything from reliability to file ownership.
Vellum stores your project as a file on your Mac’s hard drive. The file is yours. No internet connection is needed to work. No sync to manage. No account required. If Vellum’s servers went offline forever, your app and your files would keep working exactly as they are.
Atticus syncs your manuscript to cloud servers. Your project data travels between your device and Atticus’s infrastructure. This enables cross-device access — start on your laptop, continue on your Chromebook — but it also introduces a dependency. Your working manuscript is not solely on your machine. It exists in two places (your device and their server), and those two copies need to stay in sync.
When sync works, it’s invisible. When it doesn’t, it can be catastrophic. Local-first tools like Vellum and Cambric avoid this class of problem entirely — your manuscript is a file on your hard drive, and sync is never part of the equation. For more on why this architecture matters, see why local-first matters for your manuscript.
Reliability
Vellum is rock-solid. In years of use by tens of thousands of authors, reports of data loss or corruption are essentially nonexistent. The tool launches, it works, it exports. Author forums are full of Vellum praise but almost devoid of Vellum complaints. The software has the kind of reputation that companies spend years earning and can lose in a single bad update.
Atticus has a more complicated reliability record. Authors have reported:
- Chapters disappearing after sync conflicts between devices
- Manuscript corruption during offline-to-online transitions
- Paste operations causing permanent corruption — acknowledged in Atticus’s own documentation
- Performance degradation with manuscripts over 80,000 words, including typing lag, slow preview rendering, and sluggish navigation
These aren’t hypothetical risks. They show up in the Atticus Facebook group, on r/selfpublish, on Trustpilot reviews, and in direct author accounts. The Atticus team has acknowledged sync issues and shipped patches. Development is ongoing and the tool has improved.
But the risk is structural. Cloud sync as an architecture introduces failure modes that local-only storage simply doesn’t have. Many authors use Atticus for years without incident. Others lose a chapter and never trust it again. The question is whether you’re comfortable with that variance.
If you use Atticus, keep a separate backup of your manuscript at all times. Export a DOCX copy before every major session. This is prudent advice for any tool, but it’s especially important for one where the architecture introduces sync risk.
Output quality
This is where Vellum pulls ahead, and the gap is meaningful to authors who care about interior design.
Vellum’s output is the gold standard in indie publishing. The typography is refined — proper kerning, intelligent line spacing, optical margin alignment, precise widow and orphan handling. Chapter openers use genre-specific designs: elegant drop caps, ornamental dividers, styled chapter numbers that look intentional rather than default. Scene breaks are properly spaced with decorative glyphs that match the book’s aesthetic. Front matter pages — title, copyright, dedication, half-title — look like they were designed by a professional typesetter.
The result is a book interior that stands up against traditionally published titles. Authors who hold their Vellum-formatted print proof next to a Penguin Random House book on their shelf see a comparable level of polish.
Atticus’s output is good. It is not at Vellum’s level. The differences are most visible in:
- Drop caps. Atticus’s implementation is functional but less typographically refined. The spacing between the drop cap and surrounding text doesn’t have the same precision.
- Scene break spacing. The vertical rhythm around scene breaks can feel uneven compared to Vellum’s carefully calibrated spacing.
- Fine typography. Kerning, tracking, and the subtle adjustments that make text feel polished are areas where Vellum’s native rendering engine outperforms Atticus’s browser-based one.
- Front matter styling. Less granular control over the design of title pages, copyright pages, and other front matter elements.
- Print margins. Vellum’s default settings produce interiors with better-balanced white space and gutter compensation.
For most ebook readers, the differences are minimal. Ebook rendering is controlled partly by the reading device, which limits how much any formatting tool can affect the final appearance. For print, the gap is more visible and more meaningful.
Whether this quality difference matters depends on your genre, your audience, and your personal standards. Romance and literary fiction authors — genres where readers buy print editions and care about the physical book as an object — tend to notice and care more. Authors publishing primarily to Kindle in fast-paced genres may find Atticus’s output entirely sufficient. Cambric uses a Typst-based typesetting engine that handles kerning, widow/orphan control, and margin balancing at the engine level — producing output quality comparable to Vellum’s, on both Windows and Mac.
Templates
Vellum offers roughly 25 built-in styles with extensive customization within each style. The templates cover a wide range of genres and aesthetics, from clean modern to classic literary. Each template includes matched designs for chapter openers, scene breaks, front matter, and back matter. The consistency within each style is a strength — everything looks like it belongs together.
Atticus offers a comparable number of templates, with regular additions through updates. The template variety is solid, covering fiction and non-fiction. Customization options have expanded over time, and the team has been responsive to author requests for new styles.
Both tools let you adjust trim size, font selection, scene break style, and other formatting elements within the constraints of the chosen template. Neither requires manual layout work.
Writing editor
Atticus includes a writing editor with chapter-based organization, word count tracking, and basic manuscript management. You can write your book and format it in the same application. The editor is functional — not as powerful as Scrivener for complex manuscript organization, but adequate for straightforward drafting.
Vellum has no writing editor. It’s a formatting tool only. You write your manuscript in a separate application (Word, Scrivener, Google Docs, or any tool that exports .docx) and import the finished manuscript into Vellum for formatting.
This is a genuine advantage for Atticus if you want a single tool for your entire workflow. It’s irrelevant if you already have a writing tool you prefer. Most authors have strong opinions about their writing tool, and switching to Atticus’s editor just to consolidate tools may not be worth the trade-off.
Ebook and print capabilities
Both tools produce ebook (EPUB) and print-ready (PDF) files. Both export files compatible with KDP, IngramSpark, Apple Books, Kobo, and other major retailers.
Vellum generates retailer-specific EPUB variants optimized for each platform’s rendering engine. This attention to per-platform optimization is one of the reasons Vellum-formatted ebooks consistently look polished across devices.
Atticus generates standard EPUBs that work across platforms. The output is compatible and functional, though it doesn’t include the per-retailer optimization that Vellum provides.
For print, both tools handle trim size, margins, bleed settings, and PDF generation. Vellum’s print output is more refined in its default settings. Atticus’s print output is solid and passes validation on major platforms.
Community and support
Vellum has a dedicated user base and responsive support, but no large public community forum. Authors discuss Vellum in general indie publishing groups (20BooksTo50K, r/selfpublish, SPF conference circles). The tool is mature and well-documented, so support needs tend to be minimal.
Atticus has an active Facebook group with thousands of members. The community is genuinely helpful for troubleshooting, sharing tips, and requesting features. Dave Chesson (Atticus’s creator) and the team are present in the group. The Kindlepreneur blog also provides tutorials and guides.
Atticus’s community is a real asset. If you run into issues or need help with a specific formatting challenge, you’ll likely get answers quickly from other authors.
Who Vellum is for
Vellum is the right choice if:
- You’re on a Mac (non-negotiable)
- Output quality is your top priority
- You want the most reliable, battle-tested option
- You already have a writing tool you love
- You publish enough books to amortize the $250 cost
- You want your files fully local with zero cloud dependency
Who Atticus is for
Atticus is the right choice if:
- You’re on Windows, Linux, or Chromebook (Vellum isn’t an option)
- You want writing and formatting in one tool
- You’re comfortable with cloud storage for your manuscripts
- You write standard-length books (under 80K words)
- The $100 price difference matters to your budget
- You value the active community for support and troubleshooting
Who neither tool perfectly serves
There’s a gap in the middle. Authors who want:
- Vellum’s output quality philosophy but on Windows
- Atticus’s feature breadth (writing + formatting) but with local file storage
- Desktop performance without cloud dependency
- Professional templates without the Mac requirement
This is the gap that Cambric was built to fill. It’s a desktop-native app for Windows and Mac at $109 — with a writing editor, 20+ professional templates, local-first file storage, and export to all major retailers. It combines Vellum’s commitment to output quality with Atticus’s ambition to be a complete workflow tool, without the platform restriction of one or the cloud dependency of the other. The Typst-based typesetting engine runs entirely on your machine, so exports are fast and never depend on a server. And at $109, it costs less than either Vellum or Atticus.
If neither Vellum nor Atticus feels like the right fit, it’s worth looking at what the full landscape of formatting tools has to offer. You can also use our margin calculator and spine calculator to preview the specifications your book will need, regardless of which tool you choose.