Polishing, for Japanese researchers.
Turn AI-written Japanese into natural academic prose.
Morphology-aware: verb endings, particles, and kanji ratio all tuned to slip past AI detectors.
🔒 Students: verify with .ac.jp email for 50% off annual
What is Suikou AI?
A Japanese humanizer built for researchers and graduate students. Editage / Enago human editing costs ¥50,000-100,000 per paper and takes 3-7 days. Suikou AI takes 30 seconds, ¥1,480/month.
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 Japanese AI detector
Standalone tool returns ai_score / perplexity / burstiness — useful both for verifying our output and as an SEO entry point.
50% OFF for .ac.jp students
Verify with a .ac.jp email and annual plans drop to half price. Supporting Japanese graduate students.
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 support@suikouai.com.
Will it bypass 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 with a .ac.jp email for 50% off annual plans (Basic ¥8,880/yr, Pro ¥17,880/yr).
Payment options?
Stripe (credit card / Apple Pay / Google Pay) and Paddle (Japan-local cards, auto-handles consumption tax). JPY is the primary display; USD is secondary.
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 1,000 characters/day. 50% off annual with .ac.jp. Try it now.