Suikou AI vs StealthGPT
Suikou AI vs StealthGPT — Which AI Humanizer Wins?
Suikou AI is the StealthGPT alternative with transparent word quotas (no hidden daily caps), a free detector, morphological multilingual rewrites, and a writing-naturalization stance that keeps your account safe.
StealthGPT has the largest install base and a deep integration set, but independent tests have flagged its output as 86% AI by Turnitin after basic grammar correction, its "unlimited" tiers hide daily usage caps, and its overtly "stealth / undetectable" branding carries real payment-processor and institutional risk. Suikou AI takes the opposite posture: detector-scored quality, honest word quotas, and an academic-refinement framing — plus genuine morphological depth for Japanese, Korean, and Traditional Chinese.
Feature comparison
| Feature | Suikou AI | StealthGPT |
|---|---|---|
| Humanize quality | 3 parallel rewrites, detector-scored | Standard + Samurai engine (+$5/mo) |
| AI detector included | Free unlimited detector | Analyze endpoint; usage-counted |
| Language support | EN + JA + KO + ZH-TW morphological | Claims "7,000+ languages" (marketing) |
| Academic mode | Pro: claude-3.5-haiku academic polish | No academic mode; flagged 86% AI by Turnitin in tests |
| Citation preservation | Strict citation-token preservation | Generic handling |
| Student discount | 50% off via .edu MX verification | No student plan; promo-code resale only |
| API access | Coming Q3 2026 | API + browser/Docs/Gmail integrations |
| Entry pricing | $9.99/mo · 50K words, no daily cap | $14.99/mo; "unlimited" tiers hide daily caps |
| Free tier | 500 words/day recurring | Trial only |
| Data privacy | No training; auto-delete | See ToS |
Pricing comparison
| Tier | Suikou AI | StealthGPT |
|---|---|---|
| Free | 500 words/day, recurring | Trial only |
| Basic | $9.99/mo · 50K words | $14.99/mo · 50K words |
| Pro | $19.99/mo · 250K + Academic | $29.99/mo · 150K + Samurai |
| Annual discount | -20% | ~-20% |
Honest verdict
When Suikou wins
- ✓You want honest word quotas, not an "unlimited" plan with hidden daily caps
- ✓You write in Japanese, Korean, or Traditional Chinese and need real morphological depth
- ✓You prefer a safe academic-refinement brand over overt "stealth/undetectable" framing
- ✓You're a student with a .edu / .ac.jp email and want 50% off
- ✓You want a free unlimited detector to verify before you publish
When StealthGPT wins
- •You depend on StealthGPT's browser / Google Docs / Gmail integrations today
- •You need a public API right now (Suikou's lands Q3 2026)
- •You want the largest community of shared prompts and workflows
Switching from StealthGPT
- Check your real StealthGPT daily usage — Suikou's word quota has no daily cap
- Sign up for Suikou AI free tier — 500 words/day, no credit card
- Paste a StealthGPT draft into Suikou and run intensity 3 with the free detector
- Compare Turnitin/GPTZero scores side by side before you publish
- 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://stealthgpt.ai as of 2026-06-02. Pricing and features subject to change. Nominative fair use; all trademarks belong to their respective owners.