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Competitive comparison

Harmonic Security vs. Prompt Security

Understand AI usage and apply intelligent controls

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Harmonic

Harmonic Security

Cover more AI tools with more precise controls

Harmonic provides prompt-level visibility and inline controls across more than 1,000 browser-based AI applications, with additional discovery and governance across supported endpoint and agent workflows.

More than 40 purpose-built small language models analyze intent, context, and sensitive information. This lets security teams apply precise, context-aware policies based on the task, application, account type, user role, and requested action.

Prompt Security

Add basic AI controls to a larger EDR platform

Prompt Security is part of SentinelOne and adds AI usage discovery and controls to its broader endpoint security platform. This can be useful for teams that want baseline AI controls within an existing EDR relationship.

Its full inline controls cover a much smaller set of AI applications and rely more heavily on traditional rules and pattern matching. That limits both coverage range and policy granularity, including the ability to treat personal and enterprise AI accounts differently.

Side by side

How Harmonic and Prompt Security differ

Focus
Harmonic Security
Prompt Security
Center of gravity
Dedicated workforce AI security for employees and the agents they use.
An AI security feature within the broader SentinelOne EDR platform.
Application coverage
Prompt-level visibility and inline controls across more than 1,000 browser-based AI applications, plus supported endpoint and agent workflows.
Full inline controls across a much smaller set of AI applications.
Control precision
Purpose-built semantic models apply policies using intent, sensitive-data context, account type, user role, and requested action.
Traditional rules and pattern matching support broader warn-or-block decisions with less interaction context.
Best suited to
Organizations that need broad AI coverage and precise controls for workforce and agent activity.
SentinelOne customers seeking baseline AI discovery and controls within their existing EDR platform.

Based on publicly available information, August 2026

FAQ

Common questions

How does AI application coverage compare?

Harmonic provides prompt-level visibility and inline controls across more than 1,000 browser-based AI applications, with additional coverage across endpoint and agent workflows. Prompt Security provides full inline controls across a much smaller set of AI applications.

What makes Harmonic's controls more precise?

Harmonic's purpose-built semantic models evaluate what the user or agent is doing, the information involved, the application, the account type, the user's role, and the requested action. Prompt Security relies more heavily on traditional rules and pattern matching, which produces broader controls with less context.

Where does Prompt Security fit?

Prompt Security can be a useful baseline AI security feature for organizations already standardized on SentinelOne. Harmonic is the stronger fit when workforce AI security is a dedicated priority and the organization needs broader tool coverage, deeper understanding, and more granular controls.

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As every employee adopts AI in their work, organizations need control and visibility. Harmonic Security delivers AI Governance and Control (AIGC), the intelligent control layer that secures and enables the AI-First workforce. By understanding user intent and data context in real time, Harmonic gives security leaders all they need to help their companies innovate at pace.
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