| What it does | AI humanizer for multilingual writing with best-in-class Japanese support
| Fix AI writing fast
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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: 100 credits at sign-up, topped up by 40 every week, 2 models per rewrite, 4 fast models including GPT-6 Luna, articles up to 6,000 words. Pro: $19 per month, 1,500 credits every month, up to 5 models per rewrite, all 9 models including Claude Sonnet 5.5 and Grok 4.7, articles up to 15,000 word
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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
| - Mark passages and add notes about what's wrong
- Flip through rewrites from multiple AI models at once
- Choose from 9 AI models including GPT-6 Luna, Claude Sonnet, and Grok
- Preserve undo history and original drafts
- Support for TipTap-based editors and built-in document editor
- No need for personal API keys
- Credit-based pricing with transparent cost estimates
- Handle articles up to 6,000 words on Free plan or 15,000 on Pro
- Access 2 models on Free plan or up to 5 on Pro plan
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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
| - Never leave your editor—rewrites happen in-place without copy-paste
- Only the passages you mark change; the rest of your draft stays exactly as written
- Compare rewrites from multiple AI models side by side in one click
- Free plan with 100 credits and weekly top-ups, no card required
- Preserves full undo history even after accepting rewrites
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 4 ● no change since last check | 4 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 11 | 3 |
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| Citation Flow (Majestic) | 14 | 9 |
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| Referring domains (Majestic) | 46 | 2 |
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Suikou AI
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