Three modes to speed up every writing task
Text Cleanup
Fix typos, grammar mistakes, and improve readability. See exactly what changed with an inline diff view and a detailed list of corrections.
Reply Generation
Paste a received message and get three reply options instantly — Quick, Friendly, and Business tones. Pick your favorite and copy with one tap.
Markdown Conversion
Turn messy notes and meeting minutes into structured Markdown with proper headings, lists, and emphasis. Ready to paste into Notion, GitHub, or Qiita.
Built into every mode
3 steps, 3 seconds. Done.
STEP 01
Paste
Copy your text and paste it into Kaku. Emails, Slack messages, meeting notes — anything works.
STEP 02
Generate
Hit the Generate button or press ⌘ + Enter. AI processes it in real time.
STEP 03
Copy & Use
Copy the result with one tap. Paste it straight into your email, Slack, or Notion.
Frequently Asked Questions
What is Kaku?
Kaku is an AI writing utility that cleans up text, generates replies, and converts to Markdown — just by pasting. No prompts needed.
Can I use it without logging in?
Yes. You can use Kaku up to 50 times per day without logging in.
Is my text stored?
No. Text is processed in memory only and discarded after completion. No text content is ever stored in a database.
Is my text used for AI training?
No. Our AI providers (Google Gemini API, OpenAI API) do not use API data for model training.
What are the three reply tones?
Quick (brief, to-the-point), Friendly (warm, casual), and Business (formal, polite). Free plan includes Quick only; Pro unlocks all three.
Is there a browser extension?
Currently available as a web app. Chrome and Safari extensions are planned for the future.