AI Writing Studio for Fiction Authors

Write Better Novels with AI

You've written thousands of words. But is the pacing right? Do the characters sound real? Does chapter 12 actually work? ProseEngine scores your writing across 14 craft dimensions and helps you fix what's weak — so you publish with confidence, not hope.

Free plan forever · No credit card required

ProseEngine Editor — scene catalog, rich text editor, and metadata panelClick to enlarge

Best used on a computer · Free plan forever

Sound Familiar?

“I’ve finished my draft but I have no idea where to start revising.”

“Every time I rewrite a chapter, I break something else.”

“I’m writing a series and I can’t keep track of my own world anymore.”

“I know I need an editor but I can’t justify $2,000 right now.”

You’re not alone. These are the problems ProseEngine was built to solve.

From Self-Doubt to “This Is Actually Good”

Three steps between where you are now and a manuscript you're proud of.

Write your story, your way

Start from scratch or let AI help you get unstuck. No blank-page paralysis. Use your favorite AI model, a free one, or let us run it — no key needed.

Know exactly what needs fixing

AI reads every scene like a professional editor — pacing, tension, dialogue, voice. You see what's working and what isn't. No more guessing.

Publish with pride

Export a polished manuscript to DOCX, EPUB, or PDF. Even generate a multi-voice audiobook. Your name on a book that reads like it had a whole team behind it.

Who It's For

You've Already Done the Hardest Part — You Started Writing

📖

Writing your first novel?

You don't need an MFA. You need honest feedback that helps you improve, not vague encouragement. ProseEngine is like having a patient, brutally honest writing coach — free to start.

📚

Deep into a series?

Your readers remember details you've forgotten. Canon enforcement ensures book 4 doesn't contradict book 1 — across hundreds of thousands of words.

⚡

Publishing multiple books a year?

Time is money. Stop spending weeks on rewrites. One click improves your entire manuscript. More books, same quality, less burnout.

Create

Your First Draft Doesn't Have to Be Painful

Whether you write every word yourself or let AI help, ProseEngine makes sure the output is actually good — not generic, not off-voice, not full of contradictions. It checks its own work so you don't have to.

  • Skip the blank page anxietyGo from outline to full manuscript. Edit from abundance, not from zero.
  • Fix the whole book, not just one sceneAI identifies every weak spot across your entire manuscript and improves them together — keeping your plot coherent.
  • Quality you can trustEvery scene is scored on 14 craft dimensions. If it's not good enough, the AI rewrites it until it is.
  • Your world stays consistentNo more “wait, didn't she have blue eyes in chapter 3?” Canon enforcement catches contradictions you'd miss.
One-Click Book Improvement — all 14 quality metrics rising with before/after scores and chapter breakdownWriter relaxing at her desk while ProseEngine improves her manuscript
Analyze

Finally Know If Your Writing Is Working

That nagging feeling that something's off in chapter 8? ProseEngine tells you exactly what it is. Pacing drags? Tension drops? Dialogue feels flat? You'll see it — and know how to fix it.

  • An honest second opinion14 craft dimensions scored: hook power, tension, prose quality, dialogue, and more. Like a developmental editor who never sugarcoats.
  • Catch what readers would complain aboutCanon errors, timeline breaks, character inconsistencies — the things that earn 2‑star reviews. Caught before publish.
  • See your story's shapeVisual charts show where tension peaks, where pacing drags, where readers might put the book down.
  • Watch yourself get betterCompare draft 1 to draft 3. See your scores climb. Proof that the work is paying off.
AI Book Review — 14-metric quality scoring with ratings and comparison scoreboardAnalytics Dashboard — radar chart, bar charts, line graphs, and heatmap
Write

Everything in One Place — No More Tab Juggling

Your scenes, your notes, your world — all in one view. No more switching between Scrivener, Google Docs, spreadsheets, and a wiki. Just write.

  • Write without frictionA clean editor with AI tools built in. Highlight a paragraph, ask AI to tighten it. Done.
  • Find any scene instantly“Show me every scene where Elena appears in Athens” — search by character, location, emotion, or any detail.
  • Never lose a good versionSave named drafts. Compare them word‑by‑word. Roll back if the rewrite wasn't better.
  • Build the writing habitDaily goals, streaks, and pace projections. See exactly how many words per day to hit your deadline.
Scene Editor — chapter and scene organization
Organize

Your Story's World, Always at Your Fingertips

Remember when you forgot a character's eye color? Or that a village was destroyed in book 1 but mentioned in book 3? Never again. Every detail about your world lives in one place — and you can ask the AI anything about it.

  • One source of truthCharacters, places, items, factions — all in a living wiki that grows with your story
  • Click any name, see everythingMentions of “Elena” in your text? Click her name, see her backstory, relationships, and every scene she's in
  • See how your characters connectA visual map of every relationship. Spot missing connections or untapped conflict
  • Always linked as you writeEvery codex term highlights in your prose automatically, and each entry tracks every scene it appears in
Learn more about Story Codex →
Story Codex — character profile with scene tracking, progressions, and connections
Your Story's Brain

The AI Actually Knows Your Story

Elena has green eyes — not blue, not brown, green. The Ashworth Bridge collapsed in chapter 4. Marcus never says “please.” Your readers will remember all of this. Your AI should too.

ProseEngine reads your characters, your rules, your voice, and your lore before writing a single word. Not a summary. Not a paragraph of context. Everything.

The result? No contradictions. No characters acting out of character. No 2‑star reviews that say “the author can’t keep track of their own story.”

See how the Knowledge System works →
CharactersRulesVoiceLoreStory BibleProseEngine AIReads everything before writingProse that knows your worldno contradictions · no drift · no forgotten details
Listen

Hear Your Book with a Different Voice for Every Character

Turn your manuscript into an audiobook where each character sounds distinct. ProseEngine uses AI to figure out who’s speaking in every line, matches voices to your characters’ personalities, and produces chapter‑by‑chapter audio you can upload straight to Amazon, Findaway, or any distributor.

  • AI knows who’s talkingNo manual tagging. The AI detects every speaker and you verify with one click.
  • Voices shaped by your charactersYour character files inform each voice’s personality and tone — not random voice assignments.
  • Your keys, your costUse OpenAI, ElevenLabs, or Google Cloud TTS. See the cost estimate before you spend.
  • Publish‑ready audioPer‑chapter MP3 files, ready to upload to any audiobook platform.
Audiobook Studio — dialogue attribution, voice assignment, and audio player with chapter history
Publish & Protect

Your Manuscript Is Always Safe and Always Yours

Every writer has a horror story about lost work. A dead laptop, a corrupted file, a tool that won’t let you export. ProseEngine syncs to three cloud providers, backs up automatically, and exports to every major format — so your work is never trapped and never at risk.

  • Never lose a wordGoogle Drive, OneDrive & Dropbox sync with conflict resolution. Switch laptops and pick up where you left off.
  • Export whenever you wantDOCX, EPUB, and print‑ready PDF. Your book is never locked inside our tool.
  • Series that stay organizedGroup books into series with custom ordering — synced across all your devices.
  • Automatic daily backupsScheduled exports with rotation. Even if everything else fails, your backup is there.
Export Book to EPUB, PDF, DOCX and Cloud Sync with Google Drive, OneDrive, Dropbox
Your AI, Your Rules

Your AI. Your Cost. Your Rules.

Most AI writing tools lock you into one model, charge per word, and store your writing on their servers. ProseEngine is different. Don’t want to set up an API key? Let us run the AI for you on prepaid credits — on any plan, even free. Prefer full control? Bring any model (or run a free one on your own computer); with your own key your writing never touches our servers and we never add a markup. Either way, you’re never stuck with a model that doesn’t work for you.

Managed AI — No Key Needed

Don’t want to deal with API keys? Top up prepaid credits and we run the models for you — on any plan, including free. Pay only for what you generate.

BYOK (Bring Your Own Key)

Connect your existing API keys. Pay only what you use, directly to your provider — we never add a markup.

Per‑Task Model Selection

Assign different AI models to different tasks — use Claude for prose, GPT for outlines, Gemini for audits. Switch mid‑session.

Prompt Caching & Cost Savings

Anthropic prompt caching gives 90% discount on repeated context. Smart batching keeps your AI bill low.

Local LLM Support

Run AI entirely on your own hardware via Ollama, LM Studio, or llama.cpp. Zero internet, zero cloud, zero cost — total privacy.

Author Packs

Load a single file and every AI feature instantly uses your series' voice, characters, story rules, and terminology — or let ProseEngine draft a voice & structure pack from your own books. A ProseEngine exclusive.

The Real Cost of a Book

A Fraction of the Cost. A Fraction of the Time.

Other routes to a finished manuscript cost orders of magnitude more — and take weeks instead of minutes.

Ghostwriter
$2,000–$10,000+

Hire someone to write your book from scratch. Typical turnaround: weeks to months.

🕑 4–12 weeks

Developmental Editor
$1,000–$3,000

Professional feedback on structure, pacing, and plot. You still do all the rewriting yourself.

🕑 2–6 weeks

ProseEngine
Pennies on the dollar

Generate or improve an entire book in one click. Bring your own key and pay only your provider's token cost — or skip keys entirely and run it on prepaid Managed AI credits. Either way, a tiny fraction of traditional alternatives.

⚡ Minutes, not weeks

Pricing

Honest Pricing. No Surprises.

What you see is what you pay. Your subscription covers ProseEngine — with your own key, AI costs go straight to your provider (pick a free model and pay zero), or let us run the AI for you on prepaid credits. No surprises either way.

🔒 Your files stay under your control | 🛡️ We never sell your writing or train AI on it | 40+ AI models including free ones
Monthly Yearly Save up to 25%
Free
€0 forever
  • 3 books & 2 drafts per book, unlimited scenes
  • Story Codex with Relationship Web
  • Try every AI tool free — chat (5/day), inline edits (3/book), quality scoring (5/week), book review (1/month)
  • Or run full AI with no key — top up prepaid Managed AI credits, any plan
  • Cloud sync (Drive, OneDrive, Dropbox)
  • Rich text editor, Focus Mode, Scene Finder, Find & Replace
  • Named versions with diff, DOCX export, local backup
  • Charts, Story DNA & dashboards

Plus one free preview per book of most AI sidebar & analytics tools.

Writer
€9 /month
You save €9/year (8% off)
  • Everything in Free, plus:
  • Includes $10/mo of AI credits — run AI with no key of your own
  • Unlimited books, 3 drafts per book
  • Full AI writing toolkit — draft scenes, fix POV & voice drift, expand or condense, auto‑fill scene details
  • AI continuity checker — flags contradictions across your scenes and your canon
  • Unlimited inline AI tools (Continue, Rewrite, Describe, Tone, Market, Paragraph)
  • Unlimited AI writing chat
  • Unlimited AI quality scoring (14 craft metrics)
  • Unlimited AI book reviews
  • Codex auto‑link — names link to their entries as you write, plus AI‑written descriptions
  • Export EPUB & PDF
Most Popular
Author
€19 /month
You save €38/year (17% off)
  • Everything in Writer, plus:
  • Includes $20/mo of AI credits — run AI with no key of your own
  • Unlimited drafts & series
  • AI canon enforcement — rewrites scenes to fit the canon you load
  • Suggest Next Scene — AI recommends what to write next based on story arc
  • Metrics Compare — see exactly where a rewrite improved or regressed across all 14 craft metrics
  • AI quality gate — auto‑regenerates scenes until they pass
  • One‑click AI full‑book generation & improvement
  • Author Packs — auto‑draft one from your books, or load a file that teaches AI your series voice, canon & characters
  • Print‑ready EPUB & PDF
Studio
€29 /month
You save €87/year (25% off)
  • Everything in Author, plus:
  • Includes $30/mo of AI credits — run AI with no key of your own
  • AI Audiobook — scene‑aware multi‑voice narration
  • Collaborate with co‑authors & editors
  • AI Character DNA — emotional arcs, relationship dynamics & growth milestones
  • AI Deep Analytics — mystery threads, tension architecture & symbolic clusters
  • AI chart insights — reads your analytics and flags what to strengthen next

BYOK or Managed AI · Cancel anytime · No lock‑in

🔒

No Hidden Fees

Your subscription is the only required charge. No per‑word fees, no surprise invoices. Optional Managed AI credits are prepaid and priced upfront.

💰

Transparent AI Pricing

With your own key you pay your provider directly at their published rates — we add no margin. Or let us run it on prepaid credits (an upfront markup). Real‑time cost tracking either way.

🆕

Free AI Models

Use Google’s free Gemini tier and your AI cost is literally zero — great for individual scenes, chat, and edits. For full-book generation or batch operations, a paid key handles the volume.

The Real Cost of Writing a Novel

Credit-based tools
Forced onto marked‑up credits
Every rewrite burns their credits
Often locked to one AI model
No quality scoring
ProseEngine
Flat €19/mo for the full toolkit
BYOK: pay providers at cost, no markup
40+ AI models, your choice
14‑metric quality pipeline
FAQ

Common Questions

Explore

Explore ProseEngine

Comparisons, writing guides, and unique features — all in one place.

🤝

Join the Community

Connect with fellow fiction writers using AI. Share tips, get feedback, and help shape ProseEngine.

Discord 𝕏 X YouTube LinkedIn ✉️ Contact
✍️

Built by a Fiction Writer

ProseEngine wasn’t built by a SaaS company looking for a market. It was built by a novelist who tried every tool out there and couldn’t find one that actually understood what fiction writers need — quality feedback, world consistency, and AI that sounds like you, not a machine. So he built it himself.

You Didn't Come This Far to Publish Something Average

Your story deserves to be read the way you imagined it. ProseEngine helps you get it there — and know when you've arrived.

Set up in under a minute · Works in your browser

ProseEngine
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      Auto-Fill Metadata

      Analyze current scene text and fill all metadata fields.

      Backfill Book Metadata

      Scans all scenes in the current book and fills missing metadata fields. Existing metadata is never overwritten.

      Auto-Rename Scenes

      Generate short, evocative scene titles from text content using AI.

      Canon Audit

      Drift Scan

      Scans for POV shifts, voice drift, timeline errors, and canon violations — without rewriting. Use this to audit existing content.

      Chapter Summary

      Character Voice Check

      💭 Story Brainstorm

      Brainstorm plot ideas, character arcs, dialogue, world-building — your creative writing partner.

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      Ready to brainstorm!
      Ask anything about your story, characters, or plot.
      Import Book from File
      Import a TXT, Markdown, or DOCX manuscript as a new book
      1. Upload 2. Book Info 3. Chapters 4. Scenes 5. Metadata 6. Review
      📄
      Drop your manuscript here
      Supported: .txt, .md, .docx, .scriv (zipped)
      Detected format: --
      Total words: --
      Chapters found: --
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      Chapters Detected
        Scene Division
        Each chapter will be analyzed for natural scene breaks. Structural markers are detected first, then AI refines the boundaries.
        Using -- for scene analysis. Configure API keys in the AI Settings tab if needed.
        AI Metadata Fill
        Fill all metadata fields for every scene using AI: summary, location, characters, POV, scene type, intensity levels, tags, and all analytics fields.
        Review & Import
        Book title--
        Author--
        Chapters--
        Total scenes--
        Total words--
        Cover--
        Metadata filled--
        AI Book Creator
        Generate a complete book with AI assistance
        1. Options 2. Outline 3. Generate 4. Complete
        ✨ Create New Book
        AI Generation Settings
        💕 Engagement Boost Settings (reader obsession engine) ▼
        The single tension that must survive untouched. Never resolve.
        Not a theme—a mental itch. What haunts them later.
        Don't tell—let readers infer. No inference = no bond.
        Intentional imbalance. Love requires sharpness.
        Not a conclusion—an echo that resurfaces later.
        Makes readers feel smaller, later, and less certain—but more awake.
        Book Outline
        Generate an outline in Step 1 to see the structure here.
        Generating Your Book
        Preparing...
        Initializing generation pipeline...
        Step
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        API Cost $0.00
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        —

        Book Created Successfully!

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            Choose Your Plan

            Unlock the full power of ProseEngine.

            Monthly Yearly Save up to 25%

            BYOK or Managed AI · Cancel anytime · No lock-in

            Free
            €0 forever
            • 3 books & 2 drafts per book, unlimited scenes
            • Story Codex with Relationship Web
            • Try every AI tool free — chat (5/day), inline edits (3/book), quality scoring (5/week), book review (1/month)
            • Or run full AI with no key — top up prepaid Managed AI credits, any plan
            • Cloud sync (Drive, OneDrive, Dropbox)
            • Rich text editor, Focus Mode, Scene Finder, Find & Replace
            • Named versions with diff, DOCX export, local backup
            • Charts, Story DNA & dashboards

            Plus one free preview per book of most AI sidebar & analytics tools.

            Writer
            €9 /month
            You save €9/year (8% off)
            • Everything in Free, plus:
            • Includes $10/mo of AI credits — run AI with no key of your own
            • Unlimited books, 3 drafts per book
            • Full AI writing toolkit — draft scenes, fix POV & voice drift, expand or condense, auto‑fill scene details
            • AI continuity checker — flags contradictions across your scenes and your canon
            • Unlimited inline AI tools (Continue, Rewrite, Describe, Tone, Market, Paragraph)
            • Unlimited AI writing chat
            • Unlimited AI quality scoring (14 craft metrics)
            • Unlimited AI book reviews
            • Codex auto‑link — names link to their entries as you write, plus AI‑written descriptions
            • Export EPUB & PDF
            Most Popular
            Author
            €19 /month
            You save €38/year (17% off)
            • Everything in Writer, plus:
            • Includes $20/mo of AI credits — run AI with no key of your own
            • Unlimited drafts & series
            • AI canon enforcement — rewrites scenes to fit the canon you load
            • Suggest Next Scene — AI recommends what to write next based on story arc
            • Metrics Compare — see exactly where a rewrite improved or regressed across all 14 craft metrics
            • AI quality gate — auto‑regenerates scenes until they pass
            • One‑click AI full‑book generation & improvement
            • Author Packs — auto‑draft one from your books, or load a file that teaches AI your series voice, canon & characters
            • Print‑ready EPUB & PDF
            Studio
            €29 /month
            You save €87/year (25% off)
            • Everything in Author, plus:
            • Includes $30/mo of AI credits — run AI with no key of your own
            • AI Audiobook — scene‑aware multi‑voice narration
            • Collaborate with co‑authors & editors
            • AI Character DNA — emotional arcs, relationship dynamics & growth milestones
            • AI Deep Analytics — mystery threads, tension architecture & symbolic clusters
            • AI chart insights — reads your analytics and flags what to strengthen next
            Share Book
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            Pull all scenes from the shared book into a new local version.
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