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Mamorukun
Mask sensitive details before sending them to AI
A free Chrome extension that checks text locally before you send it to ChatGPT, Gemini or Copilot. Review and mask detected personal or confidential details, and inspect supported file attachments. Designed for Japanese workflows. No account or API key.
Hi Product Hunt! I built Mamorukun (まもるくん) to add a practical check at the moment sensitive information is about to enter an AI chat.
It checks text locally in your browser, explains detected items, and lets you select what to replace with placeholders before sending to ChatGPT, Gemini or Microsoft Copilot. You remain responsible for reviewing anything it does not detect or you choose not to mask.
Attachments work differently: Mamorukun inspects the text it can extract from supported files and reports unsupported or uninspected content. It does not redact or rewrite the file. If you explicitly continue, the original file goes to the AI service.
The extension is free, needs no account or API key, and currently focuses on Japanese workflows. Detection and masking run locally; your chosen AI service still receives the text or file you decide to send.
Mamorukun existed before the Astra Challenge. GPT-6 Astra in Codex helped review detection and file-handling boundaries, prioritize fixes, check the implementation and verify the website's explanations. Development also involved Gemini in Antigravity.
I'd value feedback on detection accuracy and whether the send-time confirmation is clear enough for everyday work.
About Mamorukun on Product Hunt
“Mask sensitive details before sending them to AI”
Mamorukun was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #159 on the daily leaderboard. A free Chrome extension that checks text locally before you send it to ChatGPT, Gemini or Copilot. Review and mask detected personal or confidential details, and inspect supported file attachments. Designed for Japanese workflows. No account or API key.
On the analytics side, Mamorukun competes within Chrome Extensions and Privacy — topics that collectively have 64.1k followers on Product Hunt. The dashboard above tracks how Mamorukun performed against the three products that launched closest to it on the same day.
Who hunted Mamorukun?
Mamorukun was hunted by かいひろき（ふろく）. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Mamorukun including community comment highlights and product details, visit the product overview.
かいひろき（ふろく）