Free Patronus – On-device firewall to monitor and control AI traffic
Patronus Protect is an on-device AI firewall that monitors and controls AI traffic locally, ensuring privacy and data sovereignty. It supports multiple providers and is planned for release in three phases: monitoring (Q2 2026), protection (Q3 2026), and integration (Q4 2026). Key features include observability, zero-trust, protection, and privacy-by-design.
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Key points
- Patronus Protect is an on-device AI firewall with no cloud dependency, providing real-time detection and enforcement.
- It offers cross-provider protection for major AI services like OpenAI, Claude, Gemini, and more.
- The roadmap includes three phases: Monitoring (Q2 2026), Protection (Q3 2026), and Integration (Q4 2026).
- Privacy-by-design ensures all analysis happens locally, with only minimal compliance metadata shared on demand.
Why it matters
This matters because patronus Protect is an on-device AI firewall with no cloud dependency, providing real-time detection and enforcement.
Technical impact
May affect model selection, inference cost, product capability, and evaluation benchmarks.
Patronus Protect - AI Firewall
On-device security
We value your
data sovereignty
We value your
data sovereignty
Patronus enforces security directly
on your device in real time, when it matters most.
No cloud dependency. No blind spots.
Just true, offline-first AI security.
Patronus enforces security directly
on your device in real time, when it matters most.
No cloud dependency. No blind spots.
Just true, offline-first AI security.
Download
Download
Join our waitlist
Join our waitlist
cross-provider protection
Gemini
Copilot
Ollama
Claude
OpenAI
Mistral
The Rest...
AI Security is fragmented across tools
AI Security is fragmented across tools
On-Device AI Firewall
Instead of relying on multiple tools, integrations, or extensions, Patronus is designed as an AI firewall operating in the network path on the endpoint.Our novel detection mechanism identifies AI traffic in one-digit milliseconds and allows us to detect AI interaction across apps, browsers, and providers.
On-Device Protection
Nobody likes another cloud dependency, especially when dealing with sensitive data, which is common in AI systems.Cloud compute enables fast detection, but comes at the cost of privacy and doesn’t always deliver the best performance.
At Patronus, we design and build our own AI systems to run directly on-device, in real time.Our methods achieve state-of-the-art performance, competing with LLM-based solutions at a fraction of the cost.
Our pillars of AI security
Observability
Any protection starts with observability.
We see what you don’t.
Zero-Trust
AI operates across apps, tools, and hidden layers.
We trust no interaction by default.
Protection
Real security goes beyond detection.Stopping threats requires real-time enforcement.
We keep the human-in-the-loop.
Privacy-by-Design
Built offline-first to protect your data.
We keep your data on your device*.
*Only minimal, compliance-ready metadata ever leaves your device on your demand.
The Roadmap
From monitoring to full AI protection - shipped in three focused phases.
In Development
Q2 2026
Phase 1
Monitoring
Initial core release with foundational monitoring
and assessment capabilities.Real-time protection available in early alpha.Enforce company policies consistently across
providers and applications.
Planned
Q3 2026
Phase 2
Protection
Full protection suite, including agentic systems,
AI browser and others.
Protection via SOTA on-device models, a
custom developed policy engine and company
wide policies.
Initial core release with foundational monitoring
and assessment capabilities. Real-time protection available in early alpha. Enforce company policies consistently across
providers and applications.
Full protection suite, including agentic systems,
AI browser, RAG and trade secrets.
Planned
Q4 2026
Phase 3
Integration
Seamless integration into your existing security stack.
Integrate Patronus on your mobile devices.
A new era of AI Security
As AI systems become more powerful and autonomous, security must move closer to the user. Patronus Protect delivers on-device protection that safeguards privacy and data sovereignty while detecting threats before data leaves the device. We prevent malicious actions and provide real access control for autonomous agents - locally, transparently, and in real time.
Interested? Don't hesitate to contact us:
[email protected]
01
For Developers
Patronus gives developers simple, powerful tools to understand and optimize AI interactions. Monitor requests and responses in real time, analyze token usage, and uncover inefficiencies across your workflows.
Built for modern AI development, Patronus provides actionable insights and smart optimization suggestions - helping you reduce costs, improve performance, and build more secure AI-powered applications.
02
For Individuals
03
For Companies
04
For the Open World
Get early access to on-device AI security. Join the Patronus Protect waitlist!
A new era of AI Security
As AI systems become more powerful and autonomous, security must move closer to the user. Patronus Protect delivers on-device protection that safeguards privacy and data sovereignty while detecting threats before data leaves the device. We prevent malicious actions and provide real access control for autonomous agents - locally, transparently, and in real time.
Interested? Don't hesitate to contact us:
[email protected]
01
For Developers
Patronus gives developers simple, powerful tools to understand and optimize AI interactions. Monitor requests and responses in real time, analyze token usage, and uncover inefficiencies across your workflows.
Built for modern AI development, Patronus provides actionable insights and smart optimization suggestions - helping you reduce costs, improve performance, and build more secure AI-powered applications.
02
For Individuals
03
For Companies
04
For the Open World
Get early access to on-device AI security. Join the Patronus Protect waitlist!
A new era of AI Security
As AI systems become more powerful and autonomous, security must move closer to the user. Patronus Protect delivers on-device protection that safeguards privacy and data sovereignty while detecting threats before data leaves the device. We prevent malicious actions and provide real access control for autonomous agents - locally, transparently, and in real time.
Interested? Don't hesitate to contact us:
[email protected]
01
For Developers
Patronus gives developers simple, powerful tools to understand and optimize AI interactions. Monitor requests and responses in real time, analyze token usage, and uncover inefficiencies across your workflows.
Built for modern AI development, Patronus provides actionable insights and smart optimization suggestions - helping you reduce costs, improve performance, and build more secure AI-powered applications.
02
For Individuals
03
For Companies
04
For the Open World
Get early access to on-device AI security. Join the Patronus Protect waitlist!
The Tradeoff
The Tradeoff
Customers want productivity and innovation
without risking privacy and security.
Customers want productivity and innovation without risking privacy and security.
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What teams demand
Ship AI features fast, without bottlenecks
Use any LLM or agent without restrictions
Integrate cloud AI into every workflow
Automate tasks with minimal IT overhead
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What security requires
Full audit logs and data traceability
Zero data leakage to external services
Strict access control and policy enforcement
GDPR, SOC2, and regulatory compliance
Patronus resolves the tradeoff
Deploy AI at full speed — with full security, full privacy, and zero compromise.
FAQ
What is an AI Firewall?
An AI Firewall is a security layer that monitors, analyzes, and controls interactions with AI systems in real time. It sits directly on the endpoint (your device) and inspects AI-related traffic—such as prompts, responses, and tool usage—before data leaves the device.
Similar to how antivirus software protects against malware, an AI Firewall protects against risks like prompt injection, sensitive data leakage, and unauthorized AI usage.
Do you depend on the cloud?
No. Core protection runs entirely on-device.
Patronus Protect is designed with a local-first architecture, meaning all detection and enforcement decisions happen directly on the endpoint. This ensures:
No dependency on external services for real-time protection Low latency and immediate enforcement Strong privacy guarantees
Optional cloud features (e.g., dashboards or compliance insights) can be enabled, but are not required.
How can this run in real time on the endpoint?
We use a multi-layer detection pipeline optimized for performance:
Lightweight heuristics and classifiers handle the majority of traffic instantly More advanced models are only used when needed Streaming-aware processing allows decisions even during partial responses (e.g. WebSockets)
This approach avoids constant heavy computation while still maintaining high detection accuracy.
Do you collect my data?
No.
All analysis happens locally on your device. We do not store or send prompts, responses, or sensitive content to external servers.
If cloud features are enabled, only minimal metadata may be shared, such as:
Usage patterns (e.g., which AI tools are used) Risk scores and categories Performance metrics
Sensitive content is never transmitted.
Why should I protect local LLMs?
Local models are not inherently safe.
Even when running on-device, they can:
Access sensitive files or system data Execute tools or commands (e.g., via agents or MCP integrations) Be manipulated through prompt injection or malicious inputs
Without controls, a local LLM can still leak data, perform unintended actions, or be exploited.
An AI Firewall ensures that every interaction—local or cloud—is governed, monitored, and enforceable.
Patronus
Patronus Protect - on-device AI Security
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Patronus
Patronus Protect - on-device AI Security
© 2026 Casdo Labs GmbH · All rights reserved.
Product
Features
Architecture
Security
Pricing
Roadmap
Company
About Us
Blog
Careers
Contact
Legal
Privacy Policy
Legal Notice
Eula
Impressum
Cookies
Patronus
Patronus Protect - on-device AI Security
© 2026 Casdo Labs GmbH · All rights reserved.
Product
Features
Architecture
Security
Pricing
Roadmap
Company
About Us
Blog
Careers
Contact
Legal
Privacy Policy
Legal Notice
Eula
Impressum
Cookies