Build Worlds. Break Rules.
Write Sci-Fi That Rewires Minds.
ProseEngine is the AI writing studio with tools designed for science fiction. Canon enforcement keeps your tech rules consistent. Engagement Boost makes readers question reality.
Ready to write with real quality feedback?
Try ProseEngine FreeWhy Sci-Fi Writers Choose ProseEngine
Canon Enforcement for Tech Rules
Define your world's physics, technology constraints, and political structures. The AI checks every scene against your rules — no FTL in a hard-sci-fi universe unless you say so. Add faction hierarchies, alien biology, temporal mechanics, whatever your universe demands. Every generated scene respects the boundaries you set.
Sci-Fi Engagement Mode
Two exclusive fields no other tool offers: Reality Assumption to Damage (which belief should this scene crack?) and Scale Signal (end with something vaster than human understanding). Tuned for cosmic awe-dread and ontological questioning. Makes readers feel smaller, less certain, more awake.
Story DNA & Mystery Swimlane
Visualize your tension architecture, track mystery threads from open to close, and see your entire narrative structure at a glance. Perfect for multi-layered sci-fi plots where a subplot seeded in chapter two detonates in chapter forty. Never lose a thread across a 120,000-word series.
World-Building Codex
Story Codex tracks characters, places, factions, concepts, and technology. Auto-linking highlights every reference in your text. AI-generated descriptions fill backstory automatically. An interactive Relationship Web maps faction alliances and character networks as a force-directed graph. Build a living encyclopedia of your universe that grows alongside your manuscript.
The Sci-Fi Quality Pipeline
Six stages that turn a prompt into publication-ready science fiction.
Generate
AI writes with Sci-Fi Engagement Mode active — cosmic awe-dread, ontological questioning, scale signals baked into the prose from the first word.
Validate
Structure check for info-dump balance and pacing. Catches the classic sci-fi trap: three pages of exposition where one sentence would do.
Quality Gate
14 metrics scored 0–100, including World Building, Mystery, and Thematic Richness. Scene auto-retries until it passes your threshold.
Canon Enforcement
Tech rules, political structures, timeline consistency — every detail checked against your world bible. Violations flagged before they reach your manuscript.
Drift Detection
POV consistency across multi-narrator stories. Catches voice bleed between characters and timeline contradictions across parallel storylines.
Finalize
Scale signal and reality-damage check. Does the scene end with something that makes the reader's world feel less certain? If not, it flags it.
Features Sci-Fi Writers Love
- Sci-Fi Engagement preset — cosmic awe-dread, Reality Assumption to Damage, Scale Signal
- Canon files for world rules, tech constraints, faction hierarchies
- Author Packs with terminology rules (“the Fold”, not “the fold”)
- Forbidden Knowledge gates — prevent AI from revealing spoilers too early
- Mystery Swimlane: see when each thread opens, stays active, and closes
- Tension Heatmap: color-coded grid of scenes by tension level
- 40+ AI models including latest GPT, Claude, Gemini + local LLMs
- Multi-voice audiobook with scene-aware narration
- Story Codex with characters, places, factions, tech, and concepts
- Relationship Web: interactive graph of character and faction connections
- Auto-detect links from scene co-occurrence and auto-generated searchable aliases
- Drift Detection for multi-POV consistency
- 14-metric quality scoring per scene
- One-click book generation with quality gates at every stage
- Pacing templates: 3-Act, Hero’s Journey, Save the Cat, Fichtean Curve
- Export to DOCX, EPUB, PDF, Print-ready PDF
The 6-Stage Quality Pipeline
Every sci-fi scene runs through this pipeline. Your tech rules are enforced automatically.
Zero API Cost Possible
Science fiction writers burn through tokens fast — world-building prompts, multi-chapter generation, canon checks, quality gates. With most tools, that means an unpredictable bill.
ProseEngine gives you three paths to completely free AI generation: Google Gemini free tier (1,500 requests/day), OpenRouter free models (Step 3.5 Flash, Nemotron, Qwen), and local LLMs via Ollama or LM Studio running on your own hardware.
Today’s free models rival the paid models of a year ago. You can generate an entire sci-fi novel — canon enforcement, quality gates, and all — without spending a cent on API usage. Your only cost is the ProseEngine subscription, starting at €9/mo.
Simple, Flat Pricing
No credits. No per-word charges. Write as much as your universe demands.
Free
- 3 books
- Scene editor & Focus Mode
- Find & Replace
- DOCX export
Writer
- 10 books
- AI generation
- Story Codex
- Quality scoring
Author
- Unlimited books
- Canon enforcement
- Engagement Boost
- Full analytics
- Author Packs
Studio
- Everything in Author
- Collaboration
- Multi-voice audiobook
- Priority features
Frequently Asked Questions
Can ProseEngine enforce the rules of my sci-fi universe?
Yes. Canon Enforcement lets you define physics, technology constraints, political structures, and any other world rules. The AI checks every generated scene against your canon files and flags violations — so if your hard-sci-fi universe forbids FTL, the AI will catch it.
What is Sci-Fi Engagement Mode?
It’s a genre-specific Engagement Boost preset that adds two exclusive fields: Reality Assumption to Damage (which belief should this scene crack?) and Scale Signal (end with something vaster than human understanding). It produces prose tuned for cosmic awe-dread and ontological questioning — the specific sensations that make readers remember science fiction.
Can I write an entire sci-fi novel with zero API cost?
Yes. ProseEngine supports Google Gemini free tier (1,500 requests/day), OpenRouter free models, and local LLMs via Ollama or LM Studio. You can generate an entire novel — including canon enforcement and quality gates — without paying for API usage.
Does ProseEngine support multi-POV sci-fi stories?
Yes. Drift Detection monitors POV consistency across narrators, and Author Packs let you define distinct voice profiles for each character. The Mystery Swimlane tracks threads across all POVs so you never lose a subplot in a multi-narrator epic.
Start Building Your Universe — Free
No credit card required. Your world rules, your AI, your story.
Start Writing Sci-Fi Free