🔴 Live — prompt-shield.onrender.com

Stop Prompt Injection
Before It Reaches Your LLM

PromptShield is a 4-layer defense middleware that blocks jailbreaks, system prompt leaking, and instruction overrides in real time.

View Live API GitHub → 
# Integrate in 3 lines
from promptshield_sdk import PromptShieldClient

client = PromptShieldClient("ps_live_yourkey")
result = client.chat("Hello!")

# Injection attempt? Blocked automatically.
result = client.chat("Ignore all previous instructions")
# → allowed: false, blocked_at_layer: 1
4
Defense Layers
30+
Attack Patterns
<2s
Avg Response Time
100%
API Coverage
Architecture

4 Layers of Defense

Every request passes through all four layers before reaching your LLM — and before the response reaches your user.

LAYER 01
🔍
Input Classification
Pattern matching + heuristic scoring detects injection attempts, jailbreak templates, and role-override attacks before anything else runs.
LAYER 02
🧹
Context Sanitization
Strips prompt delimiters, neutralizes override phrases, removes encoded payloads, and wraps input in safe boundaries.
LAYER 03
🔐
Prompt Integrity
HMAC-signs and verifies your system prompt hasn't been tampered with. Catches structural violations before the LLM call.
LAYER 04
👁
Output Monitoring
Scans LLM responses for jailbreak success signals, system prompt leakage, PII exposure, and harmful content patterns.
Use Cases

Who Needs PromptShield?

Any application that exposes an LLM to user input is vulnerable. PromptShield protects them all.

🏦
Fintechs & Banks
AI chatbots handling financial queries are prime targets. PromptShield prevents data extraction and unauthorized instruction execution.
🏥
Healthtech
Patient-facing AI tools must never leak sensitive data. Layer 4 output monitoring catches PII before it reaches users.
📚
EdTech Platforms
AI tutors deployed to students are easily manipulated. PromptShield blocks attempts to bypass content guidelines.
🏢
Enterprise AI
Internal copilots with access to sensitive company data need strong prompt security. Self-host with Docker for full control.
🛒
E-commerce Bots
Customer service AIs can be manipulated into giving unauthorized discounts or leaking pricing logic. Not anymore.
🏛
Government & NGOs
Public-facing AI tools in sensitive contexts need audit trails and compliance-ready logging. PromptShield delivers both.
Pricing

Simple, Honest Pricing

Start free. Scale as you grow. Enterprise self-hosting available.

Starter
Free
During beta
  • 1 API key
  • 60 requests/min
  • All 4 defense layers
  • Audit logs (last 1000)
  • Community support
Get Started
MOST POPULAR
Professional
$99/mo
Billed monthly
  • 10 API keys
  • Custom rate limits
  • All 4 defense layers
  • Full audit trail
  • Dashboard access
  • Email support
Contact Us
Enterprise
Custom
Annual license
  • Unlimited API keys
  • Self-hosted (Docker)
  • Custom aggression tuning
  • SLA guarantee
  • Dedicated support
  • Compliance reporting
Talk to Us
Get Started

Your LLM is exposed.
Fix it in minutes.

PromptShield integrates with any LLM backend. One API call. Full protection.

View Live API Read the Docs