Cloud Typesetting Engine
The typesetting engine
made for serious books.
Built by a team that wrote its own programming language for publishing layout.
Cloud-native, engineered for print-grade output.
Free to start.
To move a single word to the next line,
we recompute the entire paragraph.
Why ATLAS
The depth a serious book deserves.
- 01 / Paragraph Optimization
We solve the paragraph, not the line.
Knuth–Plass optimization decides line breaks for the entire paragraph at once — eliminating the uneven, jarring word spacing that standard greedy line-breaking leaves behind.
- 02 / Built for the Hardest Scripts
We started where typography breaks.
Korean has no inter-word spaces, composes by syllable blocks, and breaks by character. We built the engine to that bar. Latin manuscripts run on the same engine, with room to spare.
- 03 / Deterministic Preview
What you see is exactly what prints.
Browser preview line breaks and page boundaries match the final PDF byte-for-byte. The most common frustration of any author — “the preview was fine, the PDF wasn’t” — is structurally impossible.
- 04 / Print Production Ready
Press-ready, by default.
Every output is validated against industry trim, margin, folio, and chapter-break specifications before you download it. Upload, don’t rework.
Built by TAFO
A team that built a language, now builds books.
Before we built a typesetting tool, we built the language to describe one. Topaz is our Rust-based, domain-specific language for publishing layout. Every decision that turns a manuscript into a book — the rhythm of the prose, the breath of a chapter, the visual weight of a page — became a single, expressible rule.
We took that engine to the hardest typography market in the world. Korean book publishing runs on stricter legibility expectations than any other modern script: no inter-word spaces, syllable-block composition, per-character line breaking. Before us, there were exactly two tools for it — InDesign, and manual labor. We built ATLAS as the third.
The engine that solves Korean handles Latin with room to spare. The same Rust binary runs in your browser as on our server — same algorithm, same font metrics, same line breaks. The most common frustration of any author — “the preview was fine, the PDF wasn’t” — is something we've made structurally impossible.
Vellum proved that authors deserve commercial-grade typesetting. We're proving they deserve it without the desktop install, the macOS lock-in, or the per-book buyout. In any browser. Free to start.
How it works
From manuscript to press-ready PDF
in three steps.
- 01
Paste your manuscript
Plain text, Markdown, or direct paste — whichever way you write.
- 02
Automatic typesetting
ATLAS solves each paragraph with publication-grade typography rules to find the optimal line breaks and pagination.
- 03
Export press-ready PDF
A print-ready interior PDF, validated against commercial print-shop specifications.
Output Specimen
The fastest way to show what we mean.
〈The Rational Optimist〉 · an interior spread typeset entirely with ATLAS
Production-tested
Tested against the strict ingestion specs of every major Korean print and digital publishing channel.