A writing studio crafted for creating world-class, best-seller prose. Designed for iPad, built for serious writers.
If set, the subtitle appears on the cover image below the title in smaller text.
The name displayed on the cover, title page, copyright page, and all front/back matter. If blank, your account display name is used.
If this book belongs to a series, enter the series name. Appears on the cover and title page when set.
A short promotional tagline or blurb. Used on the back cover and in marketing materials when set.
Controls the narrative perspective for all AI-generated prose in this project.
Select a narrative structure template to guide your story's pacing and beat progression.
Select pages, then generate AI drafts — each item opens in the editor as an editable chapter.
For nonfiction and academic works. Auto-configured based on genre.
[ISBN] in your Copyright page that you replace after purchasing. Amazon KDP also offers a free ASIN (not a true ISBN) when you publish through KDP directly.
Deploy multiple AI writing agents to generate competing drafts, then collaborate on selecting and improving the best one. A judge agent evaluates all candidates, and chapter agents check for continuity conflicts (GO/NO-GO).
1-5 use palette authors. 6-10 add wildcard agents with unique prose strategies. More agents = better chimera selection but higher API usage.
Continuity guardians that check for conflicts across chapters before accepting new prose.
Generate a detailed outline for each chapter based on your notes, characters, and book structure. The AI will analyze all your project information and create ~200-250 word outlines per chapter, auto-name each chapter, and populate the sidebar.
This will create chapters with outlines. Existing chapters will not be affected. Make sure you have entered notes, characters, and book structure information first.
Minimum score prose must reach before continuing. Lower = faster, higher = better quality.
Controls prose density and ornamentation. Default: 3 (Literary).
Persistent rules the AI must follow for every generation in this project. These are given high priority in the prompt.
Describe what should happen in this scene. The more detail you provide, the better the output.
Words per chapter: -- • Chunks needed: --
You need an Anthropic API key to generate prose.
AI-powered literary translation of your selected chapter(s). Better than a standard AI translation — the AI is specifically instructed to preserve your narrative voice, adapt idioms naturally, and produce prose that reads as written rather than translated. Does not use MasterProse’s trained language intelligence, Localization Bible, or quality-check pipeline.
Select chapters using the navigator checkboxes, or open a single chapter. For full-manuscript translation with EPUB export, use GlobalProse™ above.
Enable/disable providers and set priority. Primary providers are tried first; secondary as fallback.
Style locked for visual consistency.
Choose which chapters to illustrate and how many images per chapter.
Previews via HuggingFace (free with token) + Pollinations (free with API key). Print-quality upgrades via OpenAI: ~$0.20/image.
Select the formats you want, then click Download.
Share your novel in the MasterProse community library. First chapter is always free. Readers can read the full book with a free account.
Configure your book, select the formats you want, and generate everything with one click.
Print your manuscript with illustrations. Use chapter checkboxes in the navigator to select specific chapters.
Analyzing prose quality…
Accept this paragraph and continue to the next, or reject to keep refining.
Provide instructions for how the chapter outline should be revised. The AI will rewrite the outline based on your guidance.
Tell the AI a little about yourself and it will write a polished, third-person author bio.
MasterProse is a complete writing studio designed to help you craft world-class, publication-ready prose from concept to finished manuscript. Here's how to get started with your new project:
Start by tapping the Setup Book button in the sidebar. Here you'll define your book's total word count goal, number of chapters, and quality threshold (the minimum score AI-generated prose must achieve before moving to the next section). Genesis calculates approximate words per chapter to help plan pacing. Choose a narrative structure template (Three-Act, Hero's Journey, Seven-Point, Kishoutenketsu) to guide your story.
Switch to the Characters tab to build detailed character profiles. Add names, roles, descriptions, motivations, and character arcs. These profiles are automatically fed to the AI when generating prose, ensuring your characters stay consistent throughout the story.
Use the Notes tab to organize your story's foundation. Create notes for:
Tap the gear icon (⚙) in the toolbar to access Settings. Under Project Settings you can:
Once your structure, characters, and notes are in place, open Setup Book and use Generate Outlines. The AI will analyze everything you've entered and create detailed outlines for each chapter, giving you a roadmap for your entire book.
Select any chapter from the sidebar and start writing. Use the AI button in the toolbar to generate prose. Prose is generated in scored chunks, with each chunk automatically scored and rewritten if it falls below your quality threshold. You can also use Iterative Write to generate one paragraph at a time with fine-grained quality control. Generated chapters automatically begin with an H1 heading (for KDP table of contents) and include scene breaks between beats and at chapter endings. Continue writing with the +1,000, +2,000, or +3,000 word buttons.
Use the anvil icon (⚒) in the toolbar for prose analysis to check quality, pacing, and style. The AI scores your prose across 8 dimensions and highlights areas for improvement. Use Fix Serious Only or Fix All Issues for automated rewriting. The Rethink tool lets you revise chapter outlines.
Once you have prose written, the sidebar displays a cover area. Tap Create Cover to generate an AI-powered book cover image based on your story's content and genre. You can regenerate it as many times as you like until you're satisfied. A Hugging Face API token is required (free tier available) -- add it in Settings.
When you're ready, tap the export icon (⇩) to export in multiple formats: Standard Manuscript (Shunn format with H1 chapter headings for KDP table of contents), Styled HTML, Plain Text, or a full JSON backup. Scene breaks are properly formatted in all export formats. You can also download your cover image separately.
Choose a narrative structure template to guide your story's pacing. Select "User / AI Created Outline" if you prefer to define your own chapter-by-chapter outline.
Before You Start Writing
After creating your project, fill out the AI section for best results:
The more context you provide, the better the AI-generated prose will be.
Chapter Plot
Describe major changes:
Describe how the prose should be revised. The AI will rewrite the prose based on your instructions while keeping the same story events and characters.
Import external research and reference materials into this project. These knowledge bases will be consulted during prose creation as reference materials.
No knowledge imported yet.
Text is rendered over your cover artwork — not baked into the image.
Extend your cover into a full KDP-ready wrap (Back Cover + Spine + Front).
Click text on canvas to select. Drag to move.
🔶 Orange ◆ = drag to skew | 🟩 Green ◆ = drag to shear
Perspective deform: Mac ⌥ Option + corner · PC Alt + corner · iPad/touch: ◻ Deform button
A full-featured prose editor with bold, italic, heading, blockquote, and scene break formatting. Undo/redo support, auto-save to cloud and local storage, and real-time word count tracking. Focus Mode hides all UI for distraction-free writing.
Generate prose from scene descriptions using MasterProse AI. Choose word targets from 250 to 2,000 words. Set tone, style inspiration, and use your characters and notes as context. AI Instructions persist across sessions and apply to every generation. The AI avoids common AI writing patterns, PET phrases, and em dashes to produce authentic, human-sounding prose.
Generate prose in ~100-word chunks with automatic quality scoring and refinement. Each chunk is scored against 8 dimensions (sentence variety, dialogue, sensory detail, emotional resonance, vocabulary, narrative flow, originality, and technical execution). If a chunk scores below your quality threshold, it is automatically rewritten and rescored until it passes or max iterations are reached. You approve each paragraph before continuing.
Standard prose generation (1,000+ words) uses scored chunks. The total word target is broken into ~1,000-word segments. Each segment is generated, scored, and if it falls below your quality threshold, automatically rewritten and rescored before the next segment begins. This ensures consistent quality across longer passages.
Tracks common prose errors (PET phrases, AI patterns, weak words, cliches, etc.) found during scoring across all projects. These patterns are automatically used as "negative prompts" during future prose generation, teaching the AI to avoid repeating the same mistakes. View and manage patterns via the ⚠ toolbar button. Patterns seen 2+ times become active negative prompts.
Set the minimum quality score (50-100%) in Setup Book > Quality Settings. Lower thresholds generate faster with fewer rewrites. Higher thresholds produce more polished prose but require more API calls. Default is 90%. The threshold applies to both iterative writing and scored chunk generation.
Analyze any chapter for quality using the anvil icon. MasterProse scores your prose across 8 dimensions and identifies specific issues with severity levels and estimated point impact. Use Fix Serious Only to address high-impact issues, or Fix All Issues for comprehensive improvement. The rewrite engine makes surgical changes while preserving your voice.
Generated chapters automatically begin with a Heading 1 chapter title for KDP table of contents compatibility. Scene breaks (* * *) are automatically inserted between beats and at chapter endings. You can also manually insert scene breaks using the *** button in the toolbar.
Define your book's total word count goal, number of chapters, title, and subtitle in Setup Book. Choose from narrative structure templates (Three-Act, Hero's Journey, Seven-Point, Kishoutenketsu) or create custom outlines. AI generates detailed ~200-250 word outlines per chapter based on your characters, notes, and structure.
Create detailed character profiles with name, role, description, motivation, character arc, and personality traits. Character data is automatically included as context when generating prose, ensuring consistency. Access via the Characters tab in the sidebar.
Organize story foundation with categorized notes: General, Worldbuilding, Research, and Plot. All notes are fed to the AI as context during generation. Access via the Notes tab in the sidebar.
Choose from 20+ literary genres with specialized prose style rules. Select a narrative voice/POV (first-person, third-limited, deep POV, stream-of-consciousness, and more). Genre and voice settings are saved per project and guide all AI generation. Configure in Settings > Project Settings.
Generate AI-powered book covers based on your story content and genre. Uses Hugging Face Stable Diffusion / FLUX models. Covers display your book title and optional subtitle. Requires a free Hugging Face API token (configured in Settings). Regenerate as many times as needed.
Export your manuscript in multiple formats:
MasterProse enforces strict quality rules to produce publication-ready prose:
After each generation, use +1,000, +2,000, or +3,000 buttons to continue writing. Write to Goal automatically generates prose until your project's word count target is reached, including a concluding section. Rethink lets you revise a chapter's outline before continuing.
Support for multiple users on a single device. Projects are stored in Firebase Firestore (cloud) and IndexedDB (local). Auto-save ensures no work is lost. Switch between users and projects from the home screen.
Set a daily word count target in Settings. Progress is tracked in the status bar and resets each day at midnight. Build a consistent writing habit by setting achievable daily goals.
References provide style guidance only. Generated illustrations will be wholly original.
Choose how deeply to adapt the story for the target culture. “Translate” keeps original references. “Adapt” replaces them with culturally equivalent alternatives.
Translate or culturally adapt character names to the target language. Example: “William Ford” → “Guglielmo Fordi” (Italian) or keep original.
Replace locations with culturally equivalent places in the target country. AI will research equivalent communities, landmarks, and venues. Example: “Palm Beach, Florida” → “Portofino, Liguria” (Italian)
Replace brand names, car models, and products with locally recognized equivalents. Example: “Honda Accord” → “Fiat Panda” (Italy), “Walmart” → “Carrefour” (France)
Convert dollars to local currency, miles to kilometers, Fahrenheit to Celsius, etc. Amounts will be adjusted for approximate economic equivalence. Example: “$50” → “€45”, “80 acres” → “32 hectares”
Replace dishes and ingredients with local equivalents that carry the same cultural weight. Example: “meatloaf and mashed potatoes” → “polpettone con purè” (Italy)
Adapt holidays, customs, institutions, historical references, and social norms. Example: “Thanksgiving dinner” → “pranzo di Natale” (Italy)
In languages with formal/informal address (tu/vous, tú/usted, du/Sie), AI will choose the appropriate register based on character relationships.
Replace English idioms with equivalent expressions in the target language rather than translating literally. Example: “raining cats and dogs” → “piove a catinelle” (Italian)
Review AI-suggested cultural adaptations before translating
Review the AI-generated Localization Bible. Edit any entries, then approve to use during translation.
Choose your writing format. Each wizard guides you step-by-step to a finished, publication-ready work.
Rethink Outline
Describe the changes you want applied to the outline. The AI will revise all chapter outlines based on your instructions.