| What it does | AI humanizer for multilingual writing with best-in-class Japanese support
| AI writing tool for character headcanons and scene ideas
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| Stage | Startup
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| Founded | 2026
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| Based in | HK
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| Pricing model | Freemium
| Freemium
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| Pricing | Free: 500 words/day humanize + unlimited detector (no credit card required); Basic: $9.99/month for 50,000 words/month + 30-day history + priority email support; Pro: $19.99/month for 250,000 words/month + academic mode + 90-day history + priority API queue. Student discount: 50% off annual plans wi
| Free: 50 welcome Sparks for 7 days (up to 5 standard generations). Spark Pack 500: $4.90 (up to 50 standard generations, valid 365 days). Spark Pack Plus 2,000: $14.90 (up to 200 standard generations, 24% less per Spark, valid 365 days).
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| Key features | - AI text humanizer with casual, academic, and business modes
- Free AI content detector with ai_score, perplexity, and burstiness metrics
- Morphology-aware Japanese rewriting with conjugation and particle control
- Citation and technical term preservation in academic mode
- Three parallel rewrites scored by separate detector model
- Five-step intensity slider for faithfulness vs. AI-fingerprint tradeoff
- History and re-rewrite capability (30 or 90 days depending on plan)
- Second-pass academic polish with Claude 3.5 Haiku on Pro plan
- Support for English, Japanese, Korean, German, French, Spanish, Portuguese, and Chinese
- Tested against GPTZero, Turnitin, Originality.ai, and Copyleaks
| - Generate structured headcanon ideas with premise, emotional logic, and scene hooks
- Reroll and rewrite generations with 3 Sparks per rewrite
- Save and share headcanons through public share links
- Preset prompt angles for common fandom scenarios
- Control panel for tone, angles, and canon distance customization
- Generate multiple tones for the same character premise
- Account-based result storage with persistent access after Sparks expire
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| What makes it different | - Best-in-class Japanese support with morphology-aware morpheme-level tuning, unlike generic humanizers
- Separate AI detector scores rewrites to guarantee the most natural result
- Preserves academic citations, figures, tables, and technical terminology verbatim
- Five-step granular intensity control to trade off faithfulness versus AI-fingerprint removal
- Independent developer with transparent privacy: no model training on user text, fixed deletion schedule
| - Templates and tone control built specifically for headcanon generation instead of generic chat
- Reusable, structured output designed to be saved and shared with fandom communities
- Emotional logic and expandable details for turning ideas into finished fic
- Specialized for fandom writers with existing character tension and ships
- Focused text-based generation rather than image generation
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 4 ● no change since last check | 9 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 11 | 3 |
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| Citation Flow (Majestic) | 14 | 28 |
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| Referring domains (Majestic) | 46 | 21 |
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Suikou AI
Margo