Suikou AI vs fastwrite
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Suikou AI compared with fastwrite
| Detail | 
Suikou AI | 
fastwrite |
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| What it does | AI humanizer for multilingual writing with best-in-class Japanese support
| AI writing assistant for academic papers integrated into Microsoft Word
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| Stage | Startup
| Not given
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| Founded | 2026
| Not given
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| Based in | HK
| DE
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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
| Not given
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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
| - Search over 20 million scientific papers using natural language queries
- Upload and chat with PDFs up to 1,000 pages per document
- AI-powered sentence and paragraph completion in Word with source citations
- Deep Review evaluation against nine university grading criteria
- Automatic APA 7 citation formatting
- Cross-document PDF search within entire project library
- Connector integration with Claude and ChatGPT
- Own-sources-only mode restricting generation to personal documents
- Available on macOS, Windows, and Web App
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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
| - Integrated directly into Microsoft Word workflow without switching applications
- Prevents plagiarism by automatically inserting citations and suggesting paraphrasing
- Specifically optimized for academic writing using custom language models
- Evaluates work against actual university grading criteria with specific improvement suggestions
- All work remains private and never used for model training
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 4 ● no change since last check | 35 ▼ −1 (down) since last check |
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| Trust Flow (Majestic) | 11 | 17 |
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| Citation Flow (Majestic) | 14 | 27 |
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| Referring domains (Majestic) | 46 | 153 |
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5 details filled in for both companies.
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