Forge Worlds. Cast Spells.
Write Fantasy That Endures.
ProseEngine is the AI writing studio for fantasy authors who build deep worlds. Canon enforcement keeps your magic system consistent. Story Codex tracks every character, faction, and prophecy.
Start Writing Fantasy Free
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Try ProseEngine FreeWhy Fantasy Writers Choose ProseEngine
Magic System Canon Enforcement
Define your magic's rules, costs, and limits in canon files. The AI enforces them in every scene — no free spells, no power creep, no contradictions. Your hard magic system stays hard.
Fantasy Engagement Preset
Power-sacrifice tension, cost of magic, the weight of prophecy. The Fantasy engagement preset ensures your scenes carry the mythic gravity that makes fantasy unforgettable.
World-Building Codex
Characters, Places, Items, Concepts, Events, Factions — all tracked with auto-linking. Click any name in your text to see its full entry. AI-generated progressions track how characters evolve across your epic. The Relationship Web visualizes faction alliances and character networks as an interactive force-directed graph.
Series-Aware Canon
Share canon files and Author Packs across all books in a series. The AI understands Book 1's events when writing Book 3. Forbidden Knowledge gates prevent spoilers from leaking between volumes.
The Fantasy Quality Pipeline
Every scene passes through six stages before it reaches your manuscript. Built for the demands of epic fantasy.
Generate
AI writes with Fantasy engagement — power-sacrifice tension, mythic weight, and the cost of magic woven into every scene.
Validate
Pacing check for quest structure and world-building balance. Catches scenes that rush through lore or stall the narrative.
Quality Gate
14 metrics scored 0–100 each, including World Building, Thematic Richness, and Character Depth. Scenes below your threshold are auto-retried.
Canon Enforcement
Magic rules, prophecies, faction alliances, historical events — all checked against your canon files. Contradictions are flagged before they reach the page.
Drift Detection
Character voice consistency across large casts. The AI catches when your stoic warrior suddenly sounds like your witty rogue.
Finalize
Symbolic motif weaving and sensory detail. The AI strengthens recurring imagery and grounds your world in sight, sound, and texture.
Features Fantasy Writers Love
- Fantasy Engagement preset with power-sacrifice tension and cost of magic
- Canon files for world rules, magic systems, faction hierarchies, and timelines
- Story Codex with 6 entity types and AI-generated descriptions
- Relationship Web: interactive graph of character and faction connections
- Auto-detect links and auto-generated aliases for searchable character tracking
- Progressions: track how characters change across your epic
- Author Packs with terminology rules for consistent world language
- Forbidden Knowledge gates to prevent spoilers across a series
- Chapter Presence Heatmap: see which characters are active where
- One-click book generation with quality gates on every scene
- EPUB, PDF, and print-ready export for self-publishing
The 6-Stage Quality Pipeline
Every fantasy scene runs through this pipeline. Your magic system rules are enforced automatically.
Zero API Cost Possible
Write Your Entire Fantasy Novel for Free
ProseEngine supports three paths to completely free AI generation. Use Google Gemini's free tier (1,500 requests per day), free models on OpenRouter, or run local LLMs on your own hardware with Ollama or LM Studio.
Today's free models rival the paid models of a year ago. You get the full quality pipeline — canon enforcement, quality gates, drift detection — regardless of which model you choose.
If you prefer premium models like GPT or Claude, API costs for a full fantasy novel typically run $5–15. You pay your provider directly and keep full control.
Simple, Flat Pricing
No credits. No per-word charges. Write as much as you want.
Free
- 3 books
- Scene editor
- Focus Mode
- DOCX export
Writer
- 10 books
- AI generation
- Story Codex
- Quality scoring
Author
- Unlimited books
- Canon enforcement
- Engagement Boost
- Full analytics
Studio
- Everything in Author
- Collaboration
- Audiobook
- Priority support
Start Forging Your World — Free
No credit card required. Your magic system deserves an AI that respects its rules.
Start Writing Fantasy Free