AI Writing Studio for Fiction Authors

Write Better Novels with AI

The AI writes full scenes that follow your story bible — your characters, your world, your established facts — and 14 craft metrics show you exactly what's working.

✓ 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.
Writer relaxing at her desk while ProseEngine improves her manuscript
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? Every contradiction caught before your reader finds it. Every character who drifts, flagged. 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 worldcontradictions caught · drift flagged · details remembered
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.
See it work

Watch Your Scores Climb

Every scene is scored on the same 14 craft dimensions a developmental editor would judge. Revise, re‑score, and see the difference — draft by draft. Tap a draft below.

0/100Overall
· re‑generates weak scenes, up to 3 tries, and keeps the best
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.
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
  • Start from your manuscript, not a blank pageAlready have a draft? ProseEngine reads your prose and drafts your characters, places, and factions — you review and add what you want
  • Catch continuity slips before readers doIt records each character's established details and flags any scene that contradicts them — so nothing drifts, even from book 1 to book 7
Learn more about Story Codex →
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.
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.

See What Your First Scene Scores

Start free in 60 seconds — no credit card, no key required. Write a scene, score it on all 14 dimensions, and watch it improve.

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.

In a blind test, two judges from other AI labs preferred ProseEngine’s chapters over a plain Claude chat in 43 of 58 comparisons — same model, same story bible, three novels, and 1 confirmed story-bible break against the chat’s 3. See the test →

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 up to 3 months free
In every plan unlimited scenes · Story Codex + Relationship Web · cloud sync (Drive, OneDrive, Dropbox) · charts & dashboards · named versions w/ diff · Scene Finder · Focus Mode · DOCX export
new at this tier✓carried over
Free
The full editor, with a taste of AI
€0forever
✦ First AI scene free — no key needed
Writer
Unlimited AI editing on your own prose
€9/month
1 month free
Best value
Author
AI that drafts scenes and whole books
€19/month
2 months free
Studio
Deep analytics, audiobook & co-authors
€29/month
3 months free
Plans & AI
Books & drafts3 books · 2 drafts∞ books · 3 draftsUnlimitedUnlimited
Monthly AI credits · US$—$10$20$30
Inline AI tools (Rewrite, Tone, Describe…)3 / bookUnlimitedUnlimitedUnlimited
AI chat, scoring & book reviewsFree, meteredUnlimitedUnlimitedUnlimited
AI continuity checker1 try / book1 try / book
Whole-book Continuity Check1 try / book1 try / book
Codex auto‑link—
Drift & POV fixes, metadata auto‑fill1 try / book
ExportDOCXEPUB/PDF · Story BiblePrint-readyPrint-ready
Pro generation
Scene & full-book generation1 scene / book1 scene / book
AI canon enforcement + quality gate1 try / book1 try / book
Author Packs——
Suggest Next Scene1 try / book1 try / book
Metrics Compare1 try / book1 try / book
Studio tools
Character DNA & deep analytics1 try / book1 try / book1 try / book
AI chart insights1 try / book1 try / book1 try / book
Multi-voice audiobook———
Co-author collaboration———

⚡ Power the AI with your own API key (BYOK) or prepaid Managed AI credits — available on any plan. Paid plans include a monthly credit allowance at the best per-€ rate.

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
Credits are the only way in
No option to use your own key
Often locked to one AI model
No quality scoring
ProseEngine
Plans from €9/mo, no per‑word fees
Your choice: own key at cost, or credits
40+ AI models, your choice
14‑metric quality pipeline
FAQ

Common Questions

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

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.

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ProseEngine
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Structure
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    ✨ AI Bulk Tools
    ★ Auto-Rename Scenes

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

    ⛏ Backfill Book Metadata

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

    📄 Chapter Summary

    Generate a cohesive summary of a chapter from its scenes.

      Scratchpad / History
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      This space is disposable. Use it freely.
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      💡 Just start typing — your work saves automatically. Or press 🪄 Generate to watch AI write a complete scene that follows your story bible.
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      AI Assistant
      Import Book from File ▶ Video
      Import a TXT, Markdown, or DOCX manuscript as a new book — or paste it, even a whole ChatGPT conversation
      1. Upload 2. Book Info 3. Chapters 4. Scenes 5. Metadata 6. Review
      📄
      Drop your manuscript here
      Supported: .txt, .md, .docx, .scriv (zipped)
      Or — wrote it in ChatGPT? Paste the whole conversation; your prompts and ChatGPT's comments are removed.
      Detected format: --
      Total words: --
      Chapters found: --
      No cover detected
      Chapters Detected
      Every chapter below will be imported — you don’t need to tick anything. The checkboxes are only for Merge Selected and Split at Midpoint.
        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--
        Good morning, writer!

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        What you get
          How to set it up

            Choose Your Plan

            Unlock the full power of ProseEngine.

            Monthly Yearly up to 3 months free

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

            In every plan unlimited scenes · Story Codex + Relationship Web · cloud sync (Drive, OneDrive, Dropbox) · charts & dashboards · named versions w/ diff · Scene Finder · Focus Mode · DOCX export
            new at this tier✓carried over
            Free
            The full editor, with a taste of AI
            €0forever
            ✦ First AI scene free — no key needed
            Writer
            Unlimited AI editing on your own prose
            €9/month
            1 month free
            		Best value
            Author
            AI that drafts scenes and whole books
            €19/month
            2 months free
            Studio
            Deep analytics, audiobook & co-authors
            €29/month
            3 months free
            Plans & AI
            Books & drafts3 books · 2 drafts∞ books · 3 draftsUnlimitedUnlimited
            Monthly AI credits · US$—$10$20$30
            Inline AI tools (Rewrite, Tone, Describe…)3 / bookUnlimitedUnlimitedUnlimited
            AI chat, scoring & book reviewsFree, meteredUnlimitedUnlimitedUnlimited
            AI continuity checker1 try / book1 try / book
            Whole-book Continuity Check1 try / book1 try / book
            Codex auto‑link—
            Drift & POV fixes, metadata auto‑fill1 try / book
            ExportDOCXEPUB/PDF · Story BiblePrint-readyPrint-ready
            Pro generation
            Scene & full-book generation1 scene / book1 scene / book
            AI canon enforcement + quality gate1 try / book1 try / book
            Author Packs——
            Suggest Next Scene1 try / book1 try / book
            Metrics Compare1 try / book1 try / book
            Studio tools
            Character DNA & deep analytics1 try / book1 try / book1 try / book
            AI chart insights1 try / book1 try / book1 try / book
            Multi-voice audiobook———
            Co-author collaboration———

            ⚡ Power the AI with your own API key (BYOK) or prepaid Managed AI credits — available on any plan. Paid plans include a monthly credit allowance at the best per-€ rate.

            Share Book
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            Pull Collaboration Changes
            Pull all scenes from the shared book into a new local version.
            Pulling scenes...
            💬 Annotate
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            👥 Team
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            Add an extra layer of security to your account

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