Create Books That Look Like They Were Set by a Professional Typesetter
The only publishing tool built around a real typography engine — not templates — for authors and publishers who demand exact control.
Knuth-Plass typography · Deterministic layout · Press-ready PDF & EPUB
Every feature exists because professional typography demands it.
The same algorithm used by TeX. Every paragraph is optimized for the best possible line breaks.
Hanging punctuation that makes your margins look perfect to the human eye.
Selectable text, embedded fonts, PDF/X-1a CMYK for print-on-demand.
See your typeset pages in real time as you write and edit.
Professional book designs with chapter ornaments, scene breaks, and typography presets.
English, German, French, and Spanish. Write in any language.
Six formats including Roman numerals and written-out numbers.
10 designs including SVG Bezier ornaments for professional interior decoration.
Export both formats from the same project. One tool, every output.
Real differences that matter for your books.
| Sappar Studio | Vellum | Atticus | |
|---|---|---|---|
| Typography engine | Knuth-Plass optimal line breaking | Greedy line breaking | Greedy line breaking |
| Optical margins | Yes (hanging punctuation) | No | No |
| OpenType feature controls | 22 features (user-togglable) | None | None |
| PDF/X-1a CMYK | Yes (K-only black, SWOP v2) | Yes | No |
| Selectable PDF text | Yes (embedded font glyphs) | Partial | Yes |
| Export preflight reports | Yes (machine-readable JSON) | No | No |
| Multi-language UI | 4 languages (665+ strings) | English only | English only |
| Platforms | Mac (Windows in development) | Mac only | Web app |
| Live preview | GPU-accelerated (Metal/wgpu) | Yes | Yes |
| Preview/export equivalence | Verified (LayoutSignature attestation) | Unverified | Unverified |
| Price | Let us surprise you | $249.99 | $147 |
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