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Patronus Scanner Review

Patronus Scanner is a security tool that scans text, public URLs, and documents for prompt injection attacks, providing a security layer for AI applications, agents, and users.

shipped Sep 20, 2026writingfreemium
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Patronus Scanner — product screenshot

Why it matters

1Scans text, public URLs, and documents for prompt injection attacks.
2Supports a context window of 8000 tokens.
3Offers a freemium pricing model with a Free Plan providing 100 Scan Units per UTC day.
4Available on Web and via a Command Line Interface (CLI).

About Patronus Scanner

Business Model
Freemium SaaS
Free Credits
100 Scan Units per UTC day
Platforms
Web, CLI
Target Audience
Developers and organizations using AI systems

Pricing Plans

Free Plan
Free
  • • 100 Scan Units per UTC day
  • • No account needed for testing
  • • Anonymous API access for file scans

Leadership

Patronus Studio
API DocsGitHub

overview

What is Patronus Scanner?

Patronus Scanner is a prompt injection detection tool developed by Patronus Studio that enables developers and organizations using AI systems to secure their applications, agents, and users from adversarial attacks. It provides a security layer by scanning various input types, including text, public URLs, and documents, for malicious prompt injection attempts. The tool supports a context window of 8000 tokens and integrates with existing development workflows via its API and CLI.

features

Key Features of Patronus Scanner

Patronus Scanner provides a suite of features designed to detect and mitigate prompt injection attacks across various data inputs and deployment scenarios. Its capabilities extend to different modalities and integration points, ensuring comprehensive security for AI systems.

  • Scans for prompt injection attacks in text, public URLs, and documents.
  • Supports a context window of 8000 tokens for analysis.
  • Utilizes proprietary function calling mechanisms.
  • Incorporates multiple models including Patronus proprietary, Local ONNX models, Google Gemini, GLIDER, and Lynx.
  • Offers multimodality support for text and vision inputs.
  • Provides a Command Line Interface (CLI) for local checking and integration.
  • Allows anonymous access for file scans, enhancing privacy.
  • Integrates with existing tools and workflows via its API.
  • Maintains a data retention period of 30 days.
  • Guarantees no training on user data.

use cases

Who Should Use Patronus Scanner?

Patronus Scanner is designed for developers and organizations that deploy or utilize AI systems and require robust security measures against prompt injection attacks. Its capabilities are applicable across various stages of AI application development and deployment.

  • Developers using AI systems: To integrate a security layer into their applications and agents, protecting against malicious inputs.
  • Organizations using AI systems: To safeguard their AI infrastructure and user interactions from prompt injection vulnerabilities.
  • Users interacting with AI agents: To ensure the integrity and security of their interactions with AI-powered tools.
  • Security teams: To implement proactive defenses against adversarial attacks targeting large language models.

how to use

How to Use Patronus Scanner

Patronus Scanner can be accessed via its web interface or integrated into development workflows using its API and CLI. Users can begin by creating an account or utilizing anonymous access for certain features.

pricing

Patronus Scanner Pricing & Plans

Patronus Scanner operates on a freemium model, offering a free tier for initial usage and evaluation. Specific details for paid tiers beyond the free plan are not publicly detailed, but the free plan provides a daily allowance for scanning operations.

  • Free Plan: Free, includes 100 Scan Units per UTC day.

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Pros

  • +Provides a dedicated security layer against prompt injection attacks for AI systems.
  • +Supports scanning of diverse input types: text, public URLs, and documents.
  • +Offers both a web interface and a Command Line Interface (CLI) for flexible integration.
  • +Includes a free tier with 100 Scan Units per UTC day, allowing for initial evaluation.
  • +Guarantees no training on user data, enhancing privacy and data security.
  • +Utilizes multiple detection models, including proprietary and third-party options like Google Gemini.

Cons

  • −As a hosted API, it may not offer the same level of data control as entirely self-hosted or local solutions.
  • −Specific pricing details for paid tiers beyond the free plan are not extensively detailed.
  • −Reliance on an external API for core functionality, which may introduce latency or external dependencies.
  • −Context window limited to 8000 tokens, which might be a constraint for extremely long inputs.

Similar Tools

Patronus Scanner vs Competitors

Patronus Scanner operates in the competitive landscape of AI security tools, offering a hosted API and CLI for prompt injection detection. Its approach can be compared to self-hosted binaries and entirely local solutions.

1
Augustus↗

Scans large language models against over 210 adversarial attacks, including prompt injection, and ships as a single Go binary for high performance.

Augustus is a self-hosted, open-source binary, offering more control and privacy over your data compared to Patronus Scanner's hosted API, but requires self-management for deployment and updates.

2
Little Canary↗

Employs a unique behavioral detection approach using a small local LLM to identify if an input changes the model's behavior, rather than relying on static patterns or classifiers.

Little Canary runs entirely locally without any external API calls, offering maximum data privacy and no external dependencies, which is a significant difference from Patronus Scanner's hosted API model.

3
SafePrompt↗

Provides a hosted API for prompt injection detection with a focus on ease of integration and compatibility with various LLMs.

SafePrompt offers a similar hosted API model to Patronus Scanner with a free tier for up to 10,000 validations per month, making it a direct functional alternative with a comparable pricing structure.

See every Patronus Scanner alternative, compared→

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Connect
⌘
GitHubgithub.com/patronus-protect/patronus-security-cli

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