Best AI Security markBest AI Security

Head to head · Checked against vendor sites, September 2026

Harmonic Security vs Koi (Palo Alto Networks): AI agent security compared

The verdict

Harmonic Security and Koi tie overall on our weights at 7.1 out of 10. Harmonic Security scores higher on policy, footprint and identity and audit; Koi scores higher on visibility and breadth. They tie on tool-call control and maturity. Neither publishes list prices. Harmonic Security publishes tier names.

Harmonic Security

Best for data protection in everyday AI use

Read the Harmonic Security review

Koi (Palo Alto Networks Cortex Agentic Endpoint Security)

Owner: Palo Alto Networks (acquisition completed 14 April 2026)

Best for Palo Alto Cortex customers

Read the Koi review

How do Harmonic Security and Koi compare on each criterion?

Endpoint AI control score, editorial assessment 0-10. Edge is the higher score on each row.
CriterionWeightHarmonic SecurityKoiEdge
Visibility22%79Koi
Why these scores

Harmonic Security: Finds AI tool use across browsers, desktop apps and CLI tools, including local tools on devices.

Koi: Visibility into models, MCPs, extensions and packages on the endpoint, with risk scoring.

Tool-call control20%77Tie
Why these scores

Harmonic Security: Governs at the MCP layer and tool surface, with permissions for what agents can read, write to and act on.

Koi: Blocks unsafe AI application interactions and prevents prompt injections; tool-call level mechanics not published.

Policy15%87Harmonic Security
Why these scores

Harmonic Security: Block in real time, warn the employee with context, or log silently; data classification by work intent.

Koi: Out-of-the-box policies and one-click removal of insecure packages, extensions and AI tools.

Identity and audit12%65Harmonic Security
Why these scores

Harmonic Security: Unified governance for humans and agents in Harmonic Command; per-action attribution not detailed.

Koi: Agent vs human attribution not described on the pages we reviewed.

Footprint13%86Harmonic Security
Why these scores

Harmonic Security: Rolls out through Intune, JAMF, Kandji or Group Policy with no proxy redesign.

Koi: Agent-based; offered as a Cortex XDR module and as a standalone offering.

Breadth8%67Koi
Why these scores

Harmonic Security: Centered on data protection in AI use; browser, desktop, MCP and API surfaces.

Koi: Palo Alto Networks is integrating Koi with Prisma AIRS for wider AI coverage.

Maturity10%77Tie
Why these scores

Harmonic Security: Publishes named packaging tiers (Explore, Guide, Command) but no prices.

Koi: Acquisition completed 14 April 2026 by Palo Alto Networks; pricing not published.

Total100%7.17.1Tie

How we score

How do they deploy, and what do they cost?

Published facts, reviewed September 2026.
AttributeHarmonic SecurityKoi
OwnerNot acquiredPalo Alto Networks (acquisition completed 14 April 2026)
How it reaches devicesIntune, JAMF, Kandji or Group PolicyCortex XDR module or standalone agent
Deployment detailHarmonic states it rolls out through Intune, JAMF, Kandji or Group Policy, with no proxy redesign and no certificate changes.Integrates with Cortex XDR as a module and is also available standalone as an agent-based deployment. If you run Cortex XDR, this is the lowest-friction path; if you run another EDR, expect a separate agent.
PricingTiers are published (Explore, Guide, Command), prices are not. Contact sales.Contact sales. Pricing is not published.

Source: harmonic.security · Harmonic Command · Harmonic pricing · Cortex Agentic Endpoint Security · Press release, 14 April 2026 · Reviewed Sep 2026

Which should you choose?

Choose Harmonic Security if

  • Your priority matches our designation for Harmonic Security: best for data protection in everyday AI use.
  • You want a light rollout with published deployment detail, ideally through existing EDR or MDM: Harmonic Security scores 8 to 6.
  • You want context-aware rules and answers beyond allow and block: Harmonic Security scores 8 to 7.

Choose Koi if

  • Your priority matches our designation for Koi: best for Palo Alto Cortex customers.
  • You need a fleet-wide inventory of AI agents, MCP servers, extensions and credentials on devices: Koi scores 9 to 7.
  • Your agents also run in SaaS platforms, cloud workloads or apps you build: Koi scores 7 to 6.

Frequently asked questions

Which is better, Harmonic Security or Koi (Palo Alto Networks)?

Harmonic Security and Koi tie overall on our weights at 7.1 out of 10. Harmonic Security scores higher on policy, footprint and identity and audit; Koi scores higher on visibility and breadth. They tie on tool-call control and maturity. Scores are editorial assessments from public vendor material, reviewed September 2026.

Do Harmonic Security and Koi (Palo Alto Networks) publish prices?

No. Neither publishes list prices, so ask both for a quote. Harmonic Security publishes its tier names (Explore, Guide, Command).

Do Harmonic Security or Koi (Palo Alto Networks) replace EDR?

No. The tools in this guide add control over AI agent actions and work alongside EDR. Harmonic Security: Intune, JAMF, Kandji or Group Policy. Koi: Cortex XDR module or standalone agent.

Related

Sources