Your book is more
than a document.
A writing workspace that understands your whole project.
Research, organize, write, verify, revise, and export in one workspace that holds your entire manuscript in context — every chapter, every source, every claim.
Built for serious long-form writers
Why Syntaxer
Serious writing requires more than a chatbot.
Generic AI tools solve the blank page. Syntaxer solves the 300-page project.
AI chat knows nothing about your book.
Syntaxer holds your entire manuscript in context — every chapter, every claim, every source — at once.
Chat generates. You still have to manage.
Syntaxer organizes, verifies, cross-references, and tracks your project as a structured body of work.
300 pages can't fit in a chatbox.
Every feature — claims, citations, revision history, research — is designed for long-form from day one.
Features
Everything a serious project needs.
Purpose-built tools for every stage of long-form writing.
Manuscript Binder
Organize any project into parts, chapters, and folders. Drag-and-drop restructuring that scales from a 10-chapter essay to a 300-page book.
Seven AI Writing Modes
Switch between Drafter, Researcher, Devil's Advocate, Developmental Editor, Proofreader, Fact-Checker, and more — each with its own system prompt and model.
Claim Scanning
Scan any chapter for factual claims. Each is scored by confidence level and can be individually verified against academic databases.
Citation Management
Link quotes and passages directly to your uploaded sources. Citations are tracked per chapter and formatted automatically on export.
Revision History
Every save creates a snapshot. Browse the last 50 revisions per chapter and restore any previous draft with one click.
Knowledge Graph
Extract people, places, concepts, and claims from your manuscript on demand. Visualize how entities connect across chapters.
Collaboration
Invite co-authors, editors, or researchers with OWNER, EDITOR, or VIEWER permissions. Inline comments keep feedback organized.
Readiness Score
A 0–100 score across chapter completion, verified claims, research depth, editorial polish, and citations. Know where your book actually stands.
Academic Research Search
Search OpenAlex, Semantic Scholar, PubMed, and arXiv simultaneously. Save papers and PDFs directly to your project research library.
Six Export Formats
Export to Markdown, HTML, DOCX, PDF, EPUB, or Standard Manuscript Format (SMF) — with table of contents and bibliography included.
Writing Voice Studio
Upload samples of your writing. Syntaxer learns your style and injects it into every AI generation so drafts sound like you, not like AI.
Read Mode
Full manuscript in a clean, distraction-free reading view. Review your entire book as a reader would, chapter by chapter.
Complete Project Context
AI that understands your entire book — not just the current paragraph.
When you ask Syntaxer a question or trigger a writing mode, it draws from your complete manuscript — every chapter, every source, every revision — not just whatever you've pasted into a chat window.
- Cross-chapter consistency checking
- Themes and arguments tracked across your full manuscript
- Research library integrated directly into writing context
- Project-aware suggestions, not generic rewrites
Writing Voice Studio
AI that writes like you — not like AI.
Upload samples of your own writing. Syntaxer embeds your style — sentence rhythm, vocabulary, what you avoid — and injects it into every AI-assisted draft so the output sounds like a first draft from you, not a chatbot.
- Describe your writing style, audience, and rules
- Upload existing writing as style training documents
- Create multiple voices for different projects or audiences
- Voice applied automatically to all AI writing modes
Research & Claims
Find, store, and verify — without leaving your manuscript.
Search OpenAlex, Semantic Scholar, PubMed, and arXiv simultaneously and save papers directly to your project. Upload your own PDFs and documents — Syntaxer extracts and indexes everything. Then scan any chapter for factual claims and verify each one against academic databases.
- Simultaneous search across four academic databases
- PDF and document upload with full-text indexing
- AI claim extraction with confidence scoring per claim
- Per-claim verification against academic sources
Editorial Intelligence
A developmental editor, built into every chapter.
Run a manuscript health check across your entire project. Syntaxer generates structural summaries for every chapter and analyzes the full manuscript for continuity, argument coherence, repetition, and pacing — then gives you a 0–100 readiness score you can actually act on.
- Argument structure and logical flow per chapter
- Cross-chapter continuity and repetition detection
- Pacing and length analysis across the full manuscript
- Readiness score weighted by completion, claims, and polish
Getting Started
Every kind of nonfiction, from day one.
Start from a project type — Book, Memoir, Research Report, How-To Guide, Essay — and Syntaxer creates the right chapter structure automatically. Paste your own outline, or let the AI outline assistant build one from your book idea.
- Six project types with pre-built chapter structures
- Paste your own outline in plain text
- AI outline assistant builds a structure from your description
- Select your writing voice at project creation
AI Outline Assistant
From book idea to full chapter structure in seconds.
Describe your book and the AI Outline Assistant builds a complete chapter structure — parts, chapters, and chapter descriptions — tuned to your project type. Paste your own outline in plain text, or refine the AI draft through conversation until it matches your vision exactly.
- AI generates a full chapter structure from your description
- Supports Books, Memoirs, Research Reports, Essays, and more
- Paste any existing outline and Syntaxer imports it automatically
- Restructure at any time with drag-and-drop
Source Management
Every source indexed, searchable, and linked to your writing.
Your research library lives inside the project. Upload PDFs, paste article links, or save papers directly from academic search. Every source is extracted, chunked, and vector-indexed — so when you write, Syntaxer can surface relevant passages and suggest citations from your actual library.
- PDF upload with full-text extraction and vector indexing
- Save papers directly from academic search results
- Semantic search across all your indexed sources
- Citation suggestions drawn from your own uploaded library
Read Mode
Read your whole book the way your readers will.
Switch to Read Mode at any time and your entire manuscript renders as a clean, beautifully typeset book — chapter by chapter, no toolbars, no distractions. It's the fastest way to catch issues you miss in the editor: pacing, transitions, and chapter flow become obvious when you read continuously.
- Full manuscript rendered in clean serif typography
- All chapters in reading order, no navigation required
- Distraction-free — no toolbars, panels, or UI chrome
- Instantly switch back to the editor from any point
Export
When you're done, export to anything.
Six export formats — table of contents and bibliography included automatically.
This is where serious authors write books.
Join researchers, journalists, and nonfiction authors building their best work in Syntaxer.