| What it does | AI humanizer for multilingual writing with best-in-class Japanese support
| AI workspace and notebook for long-form writing
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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: $0, includes one project with up to three documents, unlimited notes and version history, imported sources, and 50,000 lifetime starter AI tokens. Pro monthly: $9.99/month with 1,000,000 AI tokens per month. Pro annual: $69.99/year with 1,000,000 AI tokens per month.
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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
| - AI writing operations scoped to a passage (expand, outline, strengthen, summarize, critique, tone, plot, rewrite)
- Long-form projects keeping notes, sources, documents, versions together
- Voice Profile keeps whole manuscripts in consistent voice
- Audio notes transcribed into the project
- Long-form editor with outline navigation, word goals, focus mode, and local style statistics
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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
| - All writing and organization features work without AI; AI is optional
- AI operates on your notes and sources, not a blank prompt, keeping context across sessions
- Text never used to train AI models; all writing remains private
- Every AI result appears as a suggestion beside the draft; nothing rewrites in place without approval
- One project holds multiple chapters with notes and sources; suitable for book-length manuscripts
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 4 ● no change since last check | 43 ▼ −2 (down) since last check |
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| Trust Flow (Majestic) | 11 | 18 |
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| Citation Flow (Majestic) | 14 | 35 |
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| Referring domains (Majestic) | 46 | 324 |
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Suikou AI
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