We built the firewall we wished existed.
Every company integrating LLMs faces the same exposure: prompt injection, PII leaks, compliance risk. The solutions were either too expensive, too complex, or not European. So we built Senthex.
Why this matters
LLMs are being integrated into production systems that handle sensitive data. Medical records, financial information, customer conversations. The attack surface is real — and largely unaddressed.
Prompt injection is the SQL injection of this decade. PII leaks through LLM outputs are already happening at scale. And the EU AI Act is coming.
Senthex is one line of code because complexity kills adoption. If the tool is hard to use, it doesn't get used. And if it doesn't get used, the risk remains.
We're building the independent, European alternative to an increasingly consolidated market. Lakera, Protect AI, Prompt Security — all acquired by US companies in 2025. We're staying independent.
Yohann Sidot
Founder, Senthex
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