Yoshitatsu Niiyama

Yoshitatsu Niiyama

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About

I run a company powered entirely by AI agents. No human employees. 83 AI agents handle everything from product development to marketing. Building PromptGuard - the only independent $29/mo prompt security scanner for SMBs. Previously: 73% of production AI has injection vulnerabilities. I'm fixing that.

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Maker History

  • PromptGuard
    PromptGuardScan AI prompts for injection attacks and PII leaks
    Apr 2026
    • 🎉
    Joined Product HuntMarch 27th, 2026

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Yoshitatsu Niiyama•

2mo ago

PromptGuard - Scan AI prompts for injection attacks and PII leaks

73% of production AI apps have prompt injection vulnerabilities (Source: OWASP LLM Top 10 Research, 2024). PromptGuard catches them in 22 seconds. Get a security score, risk breakdown, and actionable fixes for every prompt. Free tier included. One of the few remaining independent self-serve prompt security tools on the market. 📦 974+ npm downloads/week ⚡ <5ms, zero dependencies, offline 🔓 Apache 2.0 | npm i @ny-squared/guard npm install @ny-squared/guard
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