OpenSecureAI Prompt Firewall

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Score7.0

Rank#3 of 21

From$49/mo

Free planYes

Runs onSelf-hosted, Web

Summary

OpenSecureAI Prompt Firewall evaluates text before it reaches an LLM and applies a policy to allow, flag, or block it. It combines prompt-injection detection with secret detection and PII redaction: injection or secrets trigger a block, while PII is redacted and flagged. The live firewall demonstration processes text entirely in the browser and says nothing is uploaded. Developers can also use the open-source, dependency-free engine as an npm package or CLI in applications and CI. The CLI reads files or standard input and can return a nonzero exit code when findings meet a selected threshold. The middleware can be applied to model inputs and outputs. An API key adds hosted detections for obfuscation or encoding evasions, indirect injection, tool abuse, multilingual overrides, and de-obfuscation. The Free plan is $0/month and includes 2,000 API requests monthly; Pro is $49/month and includes 50,000 requests monthly. The product is positioned for AI application teams shipping LLM features and developers building agents.

Who it is for

Prompt Firewall may suit AI application teams preparing LLM features for production and developers building agents. Developers can use the npm package or CLI in applications and CI, while the browser demonstration processes text client-side.

What is good

Combines injection and secret detection with PII redaction.
CLI can scan files or standard input.
Can be used on model inputs and outputs.
Core engine and npm packages are open source.

What to know first

Free plan includes 2,000 API requests per month.
Hosted evasion detections require an API key.
Team features and SLA are listed as planned.

Verdict

Prompt Firewall offers policy-based text checks through a browser demonstration, npm package, and CLI. Hosted detection enhancements and higher request limits are on paid plans, with Pro listed at $49/month.

OpenSecureAI Prompt Firewall plans and pricing

All plans

Free Free $0/month All in-browser tools and npm packages · 2,000 API requests/month · 30 requests/minute/key · Account-synced scan history · BYOK LLM Gateway · BYOK AI remediation opensecureai.com · 2 Oct 2026

Pro $49/mo $49/month Everything in Free · 50,000 API requests/month · 120 requests/minute/key · Hosted AI remediation and LLM Gateway completions · Priority email support opensecureai.com · 2 Oct 2026

Team Not published Custom Everything in Pro · 250,000 API requests/month · 300 requests/minute/key · Team seats and SSO (planned) · Custom rules and SLA (planned) opensecureai.com · 2 Oct 2026

Compared on AI guardrail software

Free plan: Yesopensecureai.com
Paid from: $49/moopensecureai.com
Deployment: hybridopensecureai.com
Prompt injection defense: Yesopensecureai.com
PII detection: Yesopensecureai.com
Jailbreak detection: Yesopensecureai.com
Custom policies: Yesopensecureai.com
SDK languages: TypeScriptopensecureai.com

Facts

Purpose: Prompt Firewall decides whether text is allowed, flagged, or blocked before it reaches an LLM.opensecureai.com · 2 Oct 2026
Detection: It combines prompt-injection detection, secret detection, and PII redaction under a user-controlled policy.opensecureai.com · 2 Oct 2026
Policy behavior: Injection or secrets trigger a block, while PII is redacted and flagged.opensecureai.com · 2 Oct 2026
Client-side processing: The live firewall demonstration is 100% client-side and states that nothing is uploaded.opensecureai.com · 2 Oct 2026
Developer use: The same engine is available as the free @opensecureai/firewall npm package and CLI for application and CI use.opensecureai.com · 2 Oct 2026
CI integration: The CLI can read files or stdin and return a nonzero exit code when findings meet a selected threshold.opensecureai.com · 2 Oct 2026
Scanning engines: The firewall runs separate prompt-injection and PII/secrets engines over text before applying policy.opensecureai.com · 2 Oct 2026
Inputs and outputs: OpenSecureAI describes the firewall logic as middleware usable on both model inputs and model outputs.opensecureai.com · 2 Oct 2026
Open source model: The core engine and npm packages are open source and dependency-free.opensecureai.com · 2 Oct 2026
Hosted enhancements: An API key unlocks hosted detections for obfuscation or encoding evasions, indirect injection, tool abuse, multilingual overrides, and de-obfuscation.opensecureai.com · 2 Oct 2026
Model integrations: The LLM Gateway supports OpenAI, Anthropic, xAI, and Groq providers with bring-your-own-key operation.opensecureai.com · 2 Oct 2026
Credential handling: OpenSecureAI states that gateway provider keys are never stored or logged.opensecureai.com · 2 Oct 2026
Support: The pricing page lists Community support for Free, Priority email support for Pro, and Priority plus SLA planned for Team.opensecureai.com · 2 Oct 2026
Audience: The product is positioned for AI application teams shipping LLM features to production and for developers building agents.opensecureai.com · 2 Oct 2026
Security contact: OpenSecureAI says it responds to responsible vulnerability reports within 48 hours.opensecureai.com · 2 Oct 2026