# Authr > Authr is agent-first book-writing software. AI agents (Lead, Writer, Reviewer, Line editor, Beta reader, Researcher, Continuity, plus custom roles) comment, brainstorm, research and propose inline edits inside a manuscript; the author accepts or rejects every change. Books have a manuscript tree, codex (story bible), relationship graph, timeline, outline, research notes, brainstorms, progress analytics, read-aloud and export (EPUB, DOCX, Markdown, PDF, JSON). Every action is available over a REST API and an MCP server. - App: https://app.authr.shop - API and MCP docs for agents: https://app.authr.shop/llms.txt - MCP endpoint: https://app.authr.shop/mcp (Streamable HTTP, Bearer API key) - Pricing: Free $0 (1M in-app agent tokens/month, about 15 agent tasks, 1 member); Pro $19/month or $190/year (10M tokens, about 150 tasks, 3 members); Studio $49/month or $490/year (40M tokens, about 600 tasks, 10 members). Unlimited books on all plans. External agents over MCP/API/webhooks are unlimited on all plans. ## Product - [Home](https://authr.shop/): overview - [Pricing](https://authr.shop/pricing): plans and limits - [Features: AI agents, story bible, inline suggestions, MCP | Authr](https://authr.shop/features): Every Authr feature: AI agents, inline suggestions, comments, brainstorms, codex, graph, timeline, outline, read aloud, export, MCP server and API. - [AI writing agents: editor, beta reader, continuity | Authr](https://authr.shop/features/ai-agents): Seven AI agents work inside your manuscript: Lead, Writer, Reviewer, Line editor, Beta reader, Researcher, Continuity. Add custom roles and set permissions. - [AI track changes: accept or reject every agent edit inline | Authr](https://authr.shop/features/inline-suggestions): Every AI edit arrives as an inline suggestion under the paragraph it changes. Accept or reject each one, or all at once. Every save is versioned. - [Comment on your manuscript and @mention AI agents | Authr](https://authr.shop/features/comments-and-mentions): Anchored comments on exact passages, threaded replies, and @mentions that send work to AI agents. Agents reply in the thread; replies route back automatically. - [AI brainstorming for writers: plot, characters, worldbuilding | Authr](https://authr.shop/features/brainstorms): Brainstorm plot problems with AI agents that have read your book, then press Make it so to turn the decision into changes you review. - [Story bible software with AI for characters & worlds | Authr](https://authr.shop/features/story-bible): A codex for characters, places, items, factions and lore, with mentions tracked across the manuscript and AI agents that read it before they write. - [Character relationship map for novels | Authr](https://authr.shop/features/relationship-graph): An interactive map of your characters, places and lore, built from your codex and manuscript. Drag to arrange, filter links, click through. - [Novel timeline software with plotline lanes | Authr](https://authr.shop/features/timeline): A story timeline in plotline lanes, linked to scenes and codex entries, with a told-vs-happened chart that shows every flashback. - [Novel outlining software: corkboard, plot grid & templates | Authr](https://authr.shop/features/outline): Outline on a corkboard, a plot grid or a list. Start from three acts, Save the Cat or the Hero's Journey, and let agents draft from your synopses. - [Online novel writing software with a binder & markdown editor | Authr](https://authr.shop/features/manuscript-editor): A calm markdown editor with a Scrivener-style binder: parts, chapters, scenes, statuses, synopses, targets, focus mode, autosave and history. - [Research notes for writers with an AI researcher | Authr](https://authr.shop/features/research): Keep research, notes and images with your manuscript. An AI researcher searches the web and files notes with sources. - [Search across your whole manuscript, codex and notes | Authr](https://authr.shop/features/search): ⌘K search across manuscript, codex, notes, comments and brainstorms, in one book or all of them, opening at the exact match. - [Free natural text-to-speech for proofreading your book | Authr](https://authr.shop/features/read-aloud): Listen to your manuscript with free natural English voices that run on your device, with each sentence highlighted as it's read. - [Writing goals, word count tracker and deadline pace | Authr](https://authr.shop/features/progress-and-goals): Track words added and removed per save, you versus AI agents, with daily and weekly goals, deadline pace, streaks, a writing calendar and a projected finish date. - [Export your manuscript to EPUB, DOCX, PDF and Markdown | Authr](https://authr.shop/features/export): Preview your whole book, then export EPUB 3, Word (.docx), print-ready PDF, Markdown, plain text or a full JSON backup. Import Word, Markdown or text files. - [Use Claude or ChatGPT to write your book | Authr](https://authr.shop/features/mcp-server): Connect Claude or ChatGPT to your manuscript with one link. They read the book, suggest edits and leave notes, and every change waits for your approval. - [Book writing API and webhooks for AI agents | Authr](https://authr.shop/features/api-and-webhooks): A REST API with 100 endpoints, agent docs at /llms.txt, signed webhooks with retries, task tokens and an events feed. ## Who it's for - [AI novel writing software that keeps your voice | Authr](https://authr.shop/for/novelists): Write your novel with AI agents that draft, review, beta-read and check continuity. Every edit is a suggestion you accept or reject. Free to start. - [Worldbuilding software with AI agents for fantasy & sci-fi | Authr](https://authr.shop/for/fantasy-worldbuilding): A story bible, relationship graph and timeline that link themselves as you write, with AI agents that research, invent and check continuity across your whole world. - [AI writing software for nonfiction books | Authr](https://authr.shop/for/nonfiction): Write your nonfiction book with AI agents that research with sources, review your argument and line-edit, while you approve every change. - [Write a book with Claude Code, Cursor and MCP | Authr](https://authr.shop/for/developers): A book-writing app with an MCP server and REST API: 100 tools for manuscript, codex and suggestions. Connect Claude Code or Cursor, free. ## Comparisons - [Best Sudowrite, Novelcrafter & Scrivener alternatives (2026) | Authr](https://authr.shop/alternatives): Compare Authr with Sudowrite, Novelcrafter, Scrivener, Dabble, Plottr, Campfire, World Anvil, ChatGPT, Claude and more: pricing, AI, story bible, API and MCP. - [Sudowrite alternative: Authr vs Sudowrite (2026)](https://authr.shop/alternatives/sudowrite): Comparing Authr and Sudowrite: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [Novelcrafter alternative: Authr vs Novelcrafter (2026)](https://authr.shop/alternatives/novelcrafter): Comparing Authr and Novelcrafter: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [Scrivener alternative: Authr vs Scrivener (2026)](https://authr.shop/alternatives/scrivener): Comparing Authr and Scrivener: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [Atticus alternative: Authr vs Atticus (2026)](https://authr.shop/alternatives/atticus): Comparing Authr and Atticus: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [Dabble alternative: Authr vs Dabble (2026)](https://authr.shop/alternatives/dabble): Comparing Authr and Dabble: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [Plottr alternative: Authr vs Plottr (2026)](https://authr.shop/alternatives/plottr): Comparing Authr and Plottr: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [Squibler alternative: Authr vs Squibler (2026)](https://authr.shop/alternatives/squibler): Comparing Authr and Squibler: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [NovelAI alternative: Authr vs NovelAI (2026)](https://authr.shop/alternatives/novelai): Comparing Authr and NovelAI: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [Reedsy Studio alternative: Authr vs Reedsy Studio (2026)](https://authr.shop/alternatives/reedsy): Comparing Authr and Reedsy Studio: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [Campfire alternative: Authr vs Campfire (2026)](https://authr.shop/alternatives/campfire): Comparing Authr and Campfire: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [World Anvil alternative: Authr vs World Anvil (2026)](https://authr.shop/alternatives/world-anvil): Comparing Authr and World Anvil: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [LivingWriter alternative: Authr vs LivingWriter (2026)](https://authr.shop/alternatives/livingwriter): Comparing Authr and LivingWriter: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [Google Docs alternative: Authr vs Google Docs (2026)](https://authr.shop/alternatives/google-docs): Comparing Authr and Google Docs: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [ChatGPT alternative: Authr vs ChatGPT (2026)](https://authr.shop/alternatives/chatgpt): Comparing Authr and ChatGPT: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [Claude alternative: Authr vs Claude (2026)](https://authr.shop/alternatives/claude): Comparing Authr and Claude: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. - [ProWritingAid alternative: Authr vs ProWritingAid (2026)](https://authr.shop/alternatives/prowritingaid): Comparing Authr and ProWritingAid: pricing, AI, story bible, API and MCP, export. An honest look at where each is stronger, checked 2026-11-04. ## Guides - [Writing guides: outline, draft, edit, finish | Authr](https://authr.shop/guides): Plain guides to writing a novel: outlining, story bibles, finishing a first draft, self-editing, and useful notes from AI without losing your voice. - [How to outline a novel: a simple five-step method | Authr](https://authr.shop/guides/how-to-outline-a-novel): A plain method for outlining a novel: one-sentence premise, the ending, the big turns, then scenes. Works whether you plan everything or almost nothing. - [How to build a story bible for your novel | Authr](https://authr.shop/guides/how-to-build-a-story-bible): What to put in a story bible, what to leave out, and how to keep it current: characters, places, rules and a timeline that catch continuity errors. - [How to finish the first draft of your novel | Authr](https://authr.shop/guides/how-to-finish-your-first-draft): Most first novels don't fail, they stall. Practical ways to finish your first draft: a target you can hit, no editing as you go, and what to do when stuck. - [How to edit your novel: structure, scenes, lines | Authr](https://authr.shop/guides/how-to-edit-your-novel): How to self-edit a novel in the right order: structure, then scenes, then sentences, then proofreading. Plus where AI editors help and where they don't. - [AI beta readers and editors that keep your voice | Authr](https://authr.shop/guides/ai-beta-readers-and-editors): How to get useful feedback from AI beta readers and editors: one job per reader, clear context, located notes, and edits you approve one at a time. - [How to write a book with ChatGPT or Claude | Authr](https://authr.shop/guides/write-a-book-with-chatgpt-or-claude): Why ChatGPT and Claude forget your book, and how to connect them to your manuscript in three steps so they can read every chapter and suggest edits. - [Write a book with Claude Code, Codex or Cursor | Authr](https://authr.shop/guides/write-a-book-with-claude-code): For developers: connect Claude Code, Codex or Cursor to your Authr manuscript over MCP with an API key, and review every edit as a suggestion.