HEAD TO HEAD
Glow Security matched with Harmonic Security: agentic endpoint security compared
SHORT ANSWER
On our published weights Harmonic Security scores higher overall, 5.90 to 5.40 out of 10. Glow scores higher on no criterion; Harmonic scores higher on capability rules, rollout path and named agent coverage; they tie on stop before it runs, verdict range, actor trail, cloud and workspace reach and public proof. Which fits depends on which of those criteria matters most to you.
By The Agent Desk · Agentic Endpoint Compare · Published 2026-10-11
Desk research from public vendor pages, press releases and standards pages read on 27 September and 11 October 2026. Editorial assessment; we did not run the products.
How do they compare at a glance?
Glow Security
Software control and shadow AI across the endpoint
Rank 5 of 6 among agentic endpoint vendors
Harmonic Security
Coaching people through AI data risk
Rank 6 of 8 among broader AI security platforms
Which scores higher on each criterion?
| Criterion | Weight | Glow Security | Harmonic Security | Higher |
|---|---|---|---|---|
| Stop before it runs | 25% | 7 / 10 Describes a pre-execution hook that can block an action or hold it for approval, and runtime prevention policies; mechanics are not documented on pages we could read. Source: Glow Security blog: AI agents exposed developer screenshots (29 September 2026) · Read 13 Oct 2026 | 7 / 10 Governs at the MCP layer and at the tool surface and can block in real time. Source: Harmonic Security: Harmonic Command · Read 27 Sep 2026 | Tie |
| Verdict range | 15% | 3 / 10 Documents 2 of six verdict types: Block or deny and Ask a person. "A pre-execution hook can block the action or hold it for approval." Source: Glow Security blog: AI agents exposed developer screenshots (29 September 2026) · Read 13 Oct 2026 | 3 / 10 Documents 2 of six verdict types: Block or deny and Alert or warn. "Block in real time, warn the employee with context, or log silently." Source: Harmonic Security homepage · Read 27 Sep 2026 | Tie |
| Capability rules | 15% | 6 / 10 Adaptable policies with autonomous remediation and prevention agents, and a Claude Code managed-settings bundle through its Anthropic integration. Source: Glow Security homepage · Read 13 Oct 2026 | 7 / 10 Harmonic Command sets which systems agents can read, write to and act on. Source: Harmonic Security: Harmonic Command · Read 27 Sep 2026 | Harmonic |
| Actor trail | 10% | 6 / 10 Per-user Claude usage and a compliance audit trail through the Anthropic integration, which needs Claude Enterprise and the Compliance API. Source: Glow Security: Anthropic integration · Read 13 Oct 2026 | 6 / 10 Unified governance for people and agents; per-action attribution is not detailed. Source: Harmonic Security: Harmonic Command · Read 27 Sep 2026 | Tie |
| Rollout path | 10% | 5 / 10 How Glow reaches devices is not stated on its homepage; its documentation site could not be read. Source: Glow Security homepage · Read 13 Oct 2026 | 8 / 10 Rolls out through Intune, JAMF, Kandji or Group Policy. Source: Harmonic Security homepage · Read 27 Sep 2026 | Harmonic |
| Cloud and workspace reach | 10% | 4 / 10 Reaches Claude Enterprise accounts, skills and connectors through an API key; cloud workloads are not described. Source: Glow Security: Anthropic integration · Read 13 Oct 2026 | 4 / 10 Browser, desktop, CLI, MCP gateway and API surfaces; agents running in cloud workspaces or cloud apps are not described. Source: Harmonic Security homepage · Read 27 Sep 2026 | Tie |
| Named agent coverage | 5% | 2 / 10 Names 1 of the six agents we track: Claude Code. Source: Glow Security: Anthropic integration · Read 13 Oct 2026 | 3 / 10 Names 2 of the six agents we track: Claude Code and GitHub Copilot. Source: Harmonic Security pricing (re-read 11 October 2026) · Read 11 Oct 2026 | Harmonic |
| Public proof | 10% | 7 / 10 Came out of stealth on 22 July 2026 with $180M at a $1.2B valuation led by Sequoia, Cyberstarts, Greenoaks and Redpoint, with customer quotes and a trust center on glow.io; no pricing. Source: Glow Security news: emerges from stealth with $180M (22 July 2026) · Read 13 Oct 2026 | 7 / 10 Tier names are published (Explore, Guide, Command) but no prices. Source: Harmonic Security pricing · Read 27 Sep 2026 | Tie |
Which verdicts does each document?
| Verdict type | Glow Security | Harmonic Security |
|---|---|---|
| Block or deny | Documented | Documented |
| Ask a person | Documented | Not described |
| Alert or warn | Not described | Documented |
| Mask or modify | Not described | Not described |
| Simulate first | Not described | Not described |
| Remove or scale back | Not described | Not described |
- Glow Security: "A pre-execution hook can block the action or hold it for approval."
Source: Glow Security blog: AI agents exposed developer screenshots (29 September 2026) · Read 13 Oct 2026
- Harmonic Security: "Block in real time, warn the employee with context, or log silently."
Source: Harmonic Security homepage · Read 27 Sep 2026
How does each reach devices?
Glow Security
Not stated on the homepage; Glow's documentation site could not be read.
Source: Glow Security homepage · Read 13 Oct 2026
Harmonic Security
Intune, JAMF, Kandji or Group Policy.
Source: Harmonic Security homepage · Read 27 Sep 2026
Which agents does each name?
| Agent | Glow Security | Harmonic Security |
|---|---|---|
| Claude Code | Named | Named |
| Cursor | Not named | Not named |
| GitHub Copilot | Not named | Named |
| OpenAI Codex | Not named | Not named |
| Windsurf | Not named | Not named |
| Claude Desktop | Not named | Not named |
| Named | 1 of 6 | 2 of 6 |
Which should you choose?
Choose Glow Security if you need stop before it runs and public proof. Glow Security is best for: Software control and shadow AI across the endpoint.
Choose Harmonic Security if you need rollout path and stop before it runs. Harmonic Security is best for: Coaching people through AI data risk.
Frequently asked questions
Which is better for agentic endpoint security, Glow Security or Harmonic Security?
On our published weights Harmonic Security scores higher overall, 5.90 to 5.40 out of 10. See the criterion table above for where each scores higher.
Which stops an agent action before it runs more fully, Glow Security or Harmonic Security?
They tie at 7. Glow Security: Describes a pre-execution hook that can block an action or hold it for approval, and runtime prevention policies; mechanics are not documented on pages we could read. Harmonic Security: Governs at the MCP layer and at the tool surface and can block in real time.
Do Glow Security and Harmonic Security publish prices?
Glow Security: not published. Glow Security publishes no pricing. Harmonic Security: not published. Three tiers are named (Explore, Guide, Command); prices are not published.