Best AI Security markBest AI Security

Head to head · Checked against vendor sites, September 2026

Harmonic Security vs Glow Security: AI agent security compared

The verdict

Harmonic Security scores higher overall on our weights (7.1 vs 6.7 out of 10). Harmonic Security scores higher on policy, footprint and maturity; Glow Security scores higher on visibility. They tie on tool-call control, identity and audit and breadth. Neither publishes list prices. Harmonic Security publishes tier names.

Harmonic Security

Best for data protection in everyday AI use

Read the Harmonic Security review

Glow Security

Best for software control across the endpoint

Read the Glow Security review

How do Harmonic Security and Glow Security compare on each criterion?

Endpoint AI control score, editorial assessment 0-10. Edge is the higher score on each row.
CriterionWeightHarmonic SecurityGlow SecurityEdge
Visibility22%78Glow Security
Why these scores

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

Glow Security: Positions itself as control over everything that runs on the endpoint, with Asset Intelligence and shadow AI discovery; its Anthropic integration collects per-user Claude usage, custom skills and installed connectors.

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.

Glow Security: Glow describes a pre-execution hook that can block an action or hold it for approval, and runtime prevention policies for coding agents; per-call mechanics are not documented on pages we could read.

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.

Glow Security: Adaptable policies with autonomous remediation and prevention agents, and a Claude Code managed-settings bundle through its Anthropic integration.

Identity and audit12%66Tie
Why these scores

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

Glow Security: Per-user Claude usage and a compliance audit trail through the Anthropic integration, which needs Claude Enterprise and the Compliance API; attribution for other agents is not described.

Footprint13%85Harmonic Security
Why these scores

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

Glow Security: How Glow reaches devices is not stated on its homepage, and its documentation site could not be read.

Breadth8%66Tie
Why these scores

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

Glow Security: Covers software control and asset intelligence beyond AI tools, plus enterprise AI accounts and settings through the Anthropic integration; cloud workloads are not described.

Maturity10%76Harmonic Security
Why these scores

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

Glow Security: Came out of stealth on 22 July 2026 with $180M at a $1.2B valuation, led by Sequoia, Cyberstarts, Greenoaks and Redpoint; named customer quotes and a trust center on glow.io; no pricing.

Total100%7.16.7Harmonic Security

How we score

How do they deploy, and what do they cost?

Published facts, reviewed September 2026.
AttributeHarmonic SecurityGlow Security
OwnerNot acquiredNot acquired
How it reaches devicesIntune, JAMF, Kandji or Group PolicyNot published
Deployment detailHarmonic states it rolls out through Intune, JAMF, Kandji or Group Policy, with no proxy redesign and no certificate changes.How Glow reaches devices is not stated on its homepage, and its documentation site could not be read.
PricingTiers are published (Explore, Guide, Command), prices are not. Contact sales.Contact sales. Glow Security does not publish pricing.

Source: harmonic.security · Harmonic Command · Harmonic pricing · glow.io · Glow Anthropic integration · Glow research: developer screenshots exposed by AI agents (29 Sep 2026) · Glow emerges from stealth (22 Jul 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 5.
  • You want context-aware rules and answers beyond allow and block: Harmonic Security scores 8 to 7.

Choose Glow Security if

  • Your priority matches our designation for Glow Security: best for software control across the endpoint.
  • You need a fleet-wide inventory of AI agents, MCP servers, extensions and credentials on devices: Glow Security scores 8 to 7.

Frequently asked questions

Which is better, Harmonic Security or Glow Security?

Harmonic Security scores higher overall on our weights (7.1 vs 6.7 out of 10). Harmonic Security scores higher on policy, footprint and maturity; Glow Security scores higher on visibility. They tie on tool-call control, identity and audit and breadth. Scores are editorial assessments from public vendor material, reviewed September 2026.

Do Harmonic Security and Glow Security 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 Glow Security 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. Glow Security: Not published.

Related

Sources