Make AI writing sound human.
Turn AI-generated drafts into natural, human-sounding writing in seconds.
Works across languages — with the strongest Japanese support anywhere (verb endings, particles, kanji ratio). Built to protect non-native and ESL writers whose honest work gets falsely flagged as AI.
🔒 Students: verify your .edu / .ac.jp email for 50% off annual
This study proposes a novel approach to natural language processing using deep learning. The proposed method demonstrates a significant improvement in accuracy compared to conventional methods.
We set out to explore a new way of handling natural language with deep learning. In our experiments, the approach we tried clearly outperformed the methods researchers have leaned on before.
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What is Suikou AI?
A global AI writing humanizer for academic and content writers — with best-in-class Japanese support. Human editing services charge $300-700 per paper and take 3-7 days. Suikou AI takes 30 seconds, from $9.99/month (annual plans 20% off).
Morphology-aware rewriting
Three axes tuned: verb endings (da/de aru/desu/masu), particles (wa/ga, wo/ni), and kanji-vs-hiragana ratio. Fixes the 'not Japanese-sounding' output of generic humanizers.
Academic mode
[Citation numbers], Fig 1, Table 2, and domain terms are preserved verbatim. Safe for SCI submissions, conference papers, and thesis use.
Our own AI text detector
Standalone tool returns ai_score / perplexity / burstiness across languages — useful both for verifying our own output and as a free SEO entry point. Japanese accuracy is our strongest dimension.
50% OFF for verified students
Verify with a .edu email (U.S.) or .ac.jp / .ac.uk / .ac.kr (rolling out) and your plan drops to half price — graduate and undergraduate writers worldwide.
Why Suikou AI
A third option between translation-flavored Western humanizers and slow, expensive human editing.
Features
Designed around the researcher and graduate-student workflow.
3-way parallel + in-house detector picks the best
Generates 3 candidates at temperatures 0.6 / 0.8 / 1.0, then a Qwen-72B detector scores them and returns the lowest AI-score version.
Casual / Academic / Business voice
Three style modes mapping to da, de aru, and desu-masu sentence endings. Pick the register that fits.
5-step intensity
Trade off faithfulness vs. AI-fingerprint removal in five granular steps.
History and re-rewrite
30 days history on Basic, 90 on Pro. Loop back from any past version.
Pro: academic polish via claude-3.5-haiku
In academic mode, a second pass with claude-3.5-haiku preserves citations and domain depth — production-grade for SCI submissions.
API (coming soon)
Batch API for research labs and publishers in the pipeline. Contact us.
Frequently asked
Other questions? Email [email protected].
Will it pass Turnitin / GPTZero Japanese?
We reverse-test against the Japanese editions of Turnitin and GPTZero every week and update our prompt chain accordingly. No humanizer can promise 100% — we recommend running your own detector check on the output as well.
Can I use this for my thesis?
Suikou AI is a text polishing / editing assistant. Final content and submission decisions are subject to your institution's policy and your own judgement. Academic mode preserves citations and terminology, making it safe as an editing aid.
How is it different from other humanizers?
StealthWriter / Phrasly / Undetectable.ai are English-tier tools running on translation layers. Suikou AI directly controls Japanese morphology (verb endings, particles, kanji ratio) so a native researcher reading the output finds nothing off.
Is there a student discount?
Yes — verify your student email (.edu, with .ac.jp / .ac.uk / .ac.kr rolling out) for 50% off annual plans (Basic $47.95/yr, Pro $95.95/yr after the discount).
Payment options?
Stripe (credit card / Apple Pay / Google Pay). USD is the pricing currency; ¥ is shown as a secondary reference on Japanese pages.
Do you use my text to train models?
No. Inputs and outputs are deleted after the retention window (30 days Basic, 90 days Pro). See our privacy policy.
One more pass for your research.
Free up to 500 words/day. 50% off annual for students. Try it now.