Suikou AI vs StealthWriter
Suikou AI vs StealthWriter — Which AI Humanizer Wins?
Suikou AI is the StealthWriter alternative with a free detector, multilingual humanizer, and Pro academic mode at half the price.
StealthWriter pioneered the single-pass AI humanizer category, but its single-rewrite approach and English-only depth leave gaps. Suikou AI runs three parallel rewrites at varied temperatures, scores each against a Qwen-72B detector, and returns the lowest-AI-score candidate. Add a built-in free detector, .edu student discount, and morphological depth for Japanese / Korean / Traditional Chinese, and the comparison gets one-sided fast — except where StealthWriter's longer market presence still matters.
Feature comparison
| Feature | Suikou AI | StealthWriter |
|---|---|---|
| Humanize quality | 3 parallel rewrites + detector-scored selection | Single-pass paraphrase |
| AI detector included | Built-in Qwen-72B detector, free unlimited | Detector requires separate add-on |
| Language support | EN + JA (morphological) + ZH-TW + KO | EN-primary; limited multilingual |
| Academic mode | Pro: claude-3.5-haiku second pass | Generic rewrite only |
| Citation preservation | [CITE:n], LaTeX \cite{} preserved | Citations often paraphrased |
| Student discount | 50% off via .edu MX verification | No student program |
| API access | Coming Q3 2026 | Available on higher tiers |
| Entry pricing | $9.99/mo Basic | $19.99/mo Pro entry |
| Free tier | 500 words/day humanize + unlimited detector | Limited free trial |
| Data privacy | No training on user text; deleted after 30/90d | Policy varies; check ToS |
Pricing comparison
| Tier | Suikou AI | StealthWriter |
|---|---|---|
| Free | 500 words/day | Trial only |
| Basic | $9.99/mo · 50K words | $19.99/mo |
| Pro | $19.99/mo · 250K words + Academic mode | $29.99/mo |
| Annual discount | 20% off | Varies |
Honest verdict
When Suikou wins
- ✓You write in Japanese, Korean, or Traditional Chinese and need morphological-aware rewrites
- ✓You need a free, unlimited AI detector built into the same workflow
- ✓You're a student with a .edu, .ac.jp, or .ac.uk email and want 50% off
- ✓You want academic-grade polish without paying for two separate tools
- ✓Budget matters and $9.99/mo Basic beats StealthWriter's $19.99/mo entry
When StealthWriter wins
- •You need a stable, public API today (StealthWriter has one; Suikou's lands Q3 2026)
- •Your team has institutional licenses already locked in with StealthWriter
- •You prioritize the largest install base for community-shared prompts and workflows
Switching from StealthWriter
- Export any saved templates from StealthWriter (Settings → Export)
- Sign up for Suikou AI free tier — 500 words/day, no credit card
- Paste your StealthWriter draft into Suikou's humanizer with intensity 3
- Compare detector scores side by side (Suikou's detector is free)
- Apply code SWITCH30 at checkout for 30% off your first 3 months
Use code SWITCH30 at checkout for 30% off your first 3 months
See full pricingComparison based on public information from https://stealthwriter.ai as of 2026-05-24. Pricing and features subject to change. Nominative fair use; all trademarks belong to their respective owners.