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About
Sinceerly is a lightweight AI-powered “humanizer” designed to reverse the polished, formulaic tone of AI-generated writing and make emails feel more natural, imperfect, and authentically human. Positioned as the opposite of traditional writing assistants, it integrates directly into Gmail as a Chrome extension, allowing users to draft emails normally and then transform them with a single click. It focuses on removing common AI writing signals, such as em dashes, repetitive phrases like “not just…,” and overly structured language, replacing them with simpler wording, abbreviations, and intentional imperfections. It introduces controlled variability through a single slider with three intensity levels, each progressively altering tone, structure, and formatting to mimic real-world communication styles. Users can preview all edits through highlighted changes and selectively apply them, maintaining control over the final message.
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About
Suikou AI is a global AI writing naturalizer (humanizer) with a built-in AI text detector. Paste AI-generated text and it rewrites it into natural, human-sounding prose in three registers — casual, academic, and business — in seconds. The detector scores any text for AI probability, perplexity, and burstiness so you know how "machine" your writing reads. Built by a Kyoto NLP researcher, Suikou AI's Japanese support is best-in-class: a morphology-aware engine that generic humanizers can't match, while working great across English and other languages too. Free tier covers 500 words/day; paid plans start at $9.99/mo, with a 50% student discount via .edu email verification.
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Audience
Sales professionals and outbound communicators who want AI-written emails to sound more natural and human to improve response rates
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Audience
Academic writers and graduate students (thesis, dissertation, IEEE submissions), Japanese researchers and university students who need morphology-aware Japanese naturalization, plus content creators and non-native English writers who want their AI-assisted drafts to read naturally.
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Support
Phone Support
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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Screenshots and Videos |
Screenshots and VideosNo images available
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Pricing
$4.99 per month
Free Version
Free Trial
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Pricing
$9.99/month
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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Company InformationSinceerly
United States
sinceerly.com
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Company InformationSuikou AI
Founded: 2026
Japan
suikouai.com
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Categories |
Categories |
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Integrations
Claude
Gmail
Google Chrome
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