AI Governance Comparison
Noxys vs Harmonic Security: AI Governance Compared
Harmonic Security and Noxys are both focused on securing enterprise AI usage. Harmonic uses Small Language Models for real-time data detection and coaching. Noxys adds EU AI Act compliance, European sovereignty, and a free tier. Both are strong in shadow AI — the key differences are sovereignty, compliance features, and pricing model.
Comparison Table
| Criteria | Noxys | Harmonic Security |
|---|---|---|
| Focus | European AI Firewall | AI Governance & Control Platform |
| Shadow AI Discovery | Yes, 15+ platforms | Yes (browser-level) |
| PII Detection Speed | < 10ms | < 200ms (Small Language Models) |
| User Coaching | Yes (in-browser) | Yes (intelligent coaching, key strength) |
| EU AI Act Compliance | Built-in dedicated module | No dedicated module |
| MCP Security | No | Yes (MCP server discovery & policy, unique feature) |
| Data Residency | 100% EU, zero US cloud | US-based (AWS Marketplace) |
| Deployment | Minutes (browser extension) | Browser-based |
| Pricing | Free tier, from 8 EUR/user/mo | Custom (enterprise only) |
| Agentic AI Security | Limited | Yes (MCP clients/servers) |
| Best For | EU enterprises, compliance-first | Innovation-first enterprises, agentic AI |
1. AI Usage Visibility
Both products are competitive here. Harmonic Security analyzed 22 million enterprise AI prompts in their 2025 report, demonstrating large-scale telemetry and a deep understanding of real-world usage patterns. Noxys covers 15+ AI platforms with instant shadow AI discovery from the moment the browser extension is deployed.
Harmonic's analytical depth — evidenced by public research reports — is a meaningful signal of product maturity. For organizations that want to validate their selection based on empirical data, this is an advantage. Both solutions offer comparable complete visibility for day-to-day operational needs.
2. Real-Time Protection
Harmonic uses Small Language Models for real-time detection, with an advertised latency under 200ms. Intelligent coaching is their most differentiating feature: rather than simply blocking an interaction, Harmonic guides the user toward secure behavior with contextual explanations. This is a sophisticated pedagogical approach that reduces friction while maintaining security.
Noxys intercepts prompts at the browser level with latency under 10ms and applies granular policies (block / coach / log) per department, per AI tool, and per action type. Noxys is faster; Harmonic's coaching is more semantically sophisticated. For organizations whose priority is user fluency and reducing risky behavior through education, Harmonic has an edge on this specific criterion.
3. Agentic AI and MCP Security
This is Harmonic Security's genuinely unique differentiator. The Model Context Protocol (MCP) has become the de facto standard allowing AI agents — Cursor, Claude Code, Windsurf and others — to connect to external tools: databases, APIs, file systems, business services. Harmonic discovers MCP clients deployed in the organization, identifies the MCP servers they connect to, and enforces policies on their capabilities.
A malicious or misconfigured MCP server can grant an AI agent excessive permissions on sensitive resources. As development workflows and business processes adopt agentic AI, this attack surface becomes material. Noxys does not yet cover this vector. For organizations actively deploying AI agents in their production environments, this capability from Harmonic represents a concrete advantage that deserves serious evaluation.
Note: if your organization actively uses AI agents (Cursor, Claude Code, automated workflows via MCP), Harmonic's MCP coverage is a decisive selection criterion that Noxys cannot yet meet.
4. EU AI Act Compliance
Noxys has a dedicated EU AI Act compliance module: audit trail of AI interactions, usage classification according to risk levels defined by the regulation, and report generation for auditors. This is not a marketing addition — it is a core product feature, reflecting the company's European positioning.
Harmonic Security has no dedicated EU AI Act module. The solution provides audit logs and visibility into AI interactions, which can contribute to a compliance file, but without the structured framework that specific regulatory obligations require. For European enterprises whose legal and compliance teams are anticipating AI regulatory audits, this is a significant functional gap.
5. European Sovereignty
Noxys is a French company (Noxys Security SAS) with all infrastructure hosted in Europe, with zero dependency on AWS, GCP, or Azure. Intercepted prompts, audit data, and metadata do not leave European territory. For enterprises subject to GDPR, the EU AI Act, and sector-specific requirements such as DORA (finance) or the NIS2 directive, European data residency is not optional.
Harmonic Security is a US company, available on AWS Marketplace, with US-based infrastructure. For European enterprises whose AI prompts are likely to contain personal data — which is the case for the vast majority of professional uses — transferring that data to US infrastructure raises GDPR compliance questions, including when a Data Processing Agreement is in place.
6. Pricing
Noxys publishes its pricing: a free tier for up to 10 users, then from 8 EUR per user per month for paid plans. This transparency allows a security team to evaluate the product, deploy it in production at small scale, and build an internal budget case before committing to volume.
Harmonic Security uses custom enterprise pricing with no public pricing information and no self-service free trial. This model is common in the enterprise market, but it lengthens the evaluation cycle and makes direct budget comparison difficult. For European SMEs and scale-ups, the absence of an accessible entry point is a practical barrier.
Who Should Choose Noxys
- European enterprises subject to GDPR and the EU AI Act that need a structured compliance module, audit trail, and European data residency.
- Highly regulated sectors — finance (DORA), healthcare, legal, defense — for which data sovereignty is a non-negotiable requirement.
- Organizations that want to evaluate a solution in production before committing, thanks to the free tier and transparent pricing.
- European SMEs and scale-ups that need AI-first protection deployable in minutes, without a lengthy enterprise sales cycle.
- Security teams that prioritize detection speed (under 10ms) and policy granularity per department and per AI tool.
Who Should Choose Harmonic Security
- Organizations actively adopting agentic AI in their workflows (Cursor, Claude Code, MCP agents) and needing governance over MCP connections before this vector is covered by other solutions.
- Large enterprises whose security culture emphasizes user education and behavior change over blocking — Harmonic's intelligent coaching is a genuine strength on this criterion.
- North American or multinational enterprises for which European data residency is not a strict regulatory constraint and that prioritize product maturity and analytical depth.
- Innovation-first organizations that want to be at the forefront of AI security and view MCP coverage as an investment in readiness for the agentic future.
European AI Governance — deployed in minutes
Evaluate Noxys free for up to 10 users. Built-in EU AI Act compliance, 100% EU-hosted, no credit card required.
FAQ
Are Noxys and Harmonic Security direct competitors?
Largely yes, but from different angles. Both products intercept browser-based AI interactions, discover shadow AI, and enforce governance policies. Noxys emphasizes EU AI Act compliance, data sovereignty, and accessible pricing with a free tier. Harmonic stands out for the sophistication of its user coaching and — genuinely uniquely — its ability to secure MCP environments for agentic AI. The choice depends primarily on your priority: European compliance or agentic security.
Is Harmonic Security available in Europe?
Harmonic Security is a US-based company available on AWS Marketplace. The solution can be deployed for European enterprises, but data is processed on US AWS infrastructure. For companies subject to GDPR and the EU AI Act that require European data residency, this can create a compliance issue — particularly for prompts containing personal data.
What is MCP security and why does it matter?
MCP (Model Context Protocol) is the standard that allows AI agents — such as Claude Code or Cursor — to connect to external tools (databases, APIs, file systems). Harmonic Security was among the first to identify and address this risk vector: a malicious or misconfigured MCP server can give an AI agent unauthorized access to sensitive resources. For organizations actively adopting agentic AI in their development workflows, this is a meaningful differentiator. Noxys does not yet cover this vector.