Promptlock
AI security firewall that redacts PII, blocks prompt injections, and enforces HIPAA/GDPR/PCI-DSS compliance with one API call.
| What is it | AI security firewall that redacts PII, blocks prompt injections, and enforces HIPAA/GDPR/PCI-DSS compliance with one API call. |
|---|---|
| Pricing | Freemium — from $49/mo |
| Free tier | Yes |
| Platform | API |
| API | Yes |
| Works with | n8n |
| Best for | redacting PII before sending user data to an LLM, preventing prompt injection attacks in chatbots and assistants |
| Domain registered | 2025 |
Data updated Aug. 1, 2026
What does Promptlock do?
Promptlock is an AI security firewall designed for teams that process customer data with large language models. It sits between your application and the LLM, automatically detecting and redacting personally identifiable information (PII) like names, email addresses, and credit card numbers. At the same time, it catches prompt injection attempts — including jailbreaks and system prompt overrides — before they can reach your model. The whole thing works through a single API call, making it a straightforward addition to any AI pipeline.
What sets Promptlock apart is its compliance awareness. Instead of applying a blanket redaction policy, it recognizes the regulatory context of the data: HIPAA rules for healthcare data, GDPR for EU personal data, and PCI-DSS for payment information. It also logs every request with compliance tags, so you can export a CSV or JSON audit trail. The service integrates with no-code platforms like n8n and Bubble, and provides SDK hooks for JavaScript. You get API keys from the dashboard, then add one line of code to start protecting your prompts.
This tool is built for developers and compliance officers who need to ship AI features without exposing sensitive data. If your app sends customer information to an LLM — whether for support chatbots, document analysis, or content generation — Promptlock handles the redaction and injection blocking in milliseconds. It's especially useful for startups and regulated businesses that want to avoid fines like the €15 million penalty OpenAI received from Italy's DPA in 2024.
Key features
What makes it stand outWho is Promptlock for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardFree
- 3,000 prompts per month
- 100 rate limit per minute
- 3K prompts/month (100/day)
- Prompt injection detection
- PII/PHI detection
- Compliance framework checks
- Basic redaction
- API access
- Documentation
Starter
Everything in Free, plus:
- 100,000 prompts per month
- 100 rate limit per minute
- Dashboard access
- Usage tracking & insights
- Priority email support
Pro
Everything in Starter, plus:
- 500,000 prompts per month
- 100 rate limit per minute
- PCI detection
Trust & presence
Gallery
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