About PromptDefend

The control plane for safe, efficient AI.

We help engineering and finance teams ship LLM features without the runaway bills — and without the security incidents that come with them.

Why we built it

Every company is racing to put large language models into production. Almost none of them have a handle on what those models cost — or how exposed they are. The invoice climbs, prompts balloon, premium models do trivial work, and a single injected instruction can leak data or trigger thousands of dollars of generation.

We saw the same pattern again and again: cost and security in LLMs are the same problem wearing two hats. A malicious prompt is a billing event. Good prompt hygiene is a cost saver. So we built one gateway that does both.

What we believe

  • Efficiency is a feature. Most LLM spend is waste you can remove without touching quality.
  • Security can't be bolted on. Inspection belongs inline, on every request.
  • Adoption should be one line. If it's hard to install, it won't get used.

40–70%

Typical cost reduction

Inline

Real-time inspection

Any model

OpenAI · Anthropic · OSS

SF

Based in San Francisco

Let's look at your LLM spend together.

Book a demo and we'll run a free analysis of your current usage.

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