Harmonic Security alternatives.Start with Aona.

Aona secures employee AI use with prompt and file protection. Compare its controls, coverage and deployment with the other products on your shortlist.

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A buyer’s starting point

Secure employee AI use without losing the practical detail.

Compare the control point, evaluation path and practical fit for the employee AI problem in front of you.

Aona protects employee use of third-party AI tools on managed devices, including the prompt and upload path.

Aona AI

For employee AI security

Workforce AI Security you can start today: a browser plugin for Chrome, Edge, Firefox and Safari plus a native endpoint app for ChatGPT, Copilot and Claude desktop, hard block with no user override, layout-preserving DOCX, XLSX and PDF redaction on upload rather than prompt-text redaction alone, a choice of seven Aona-managed hosting regions, and AI policy templates for the EU AI Act and ISO 42001. SOC 2 Type II, self-serve 30-day trial, deployed with IT's existing tooling, first signal within hours.

Best for: Any organisation whose employees use ChatGPT, Copilot, Claude or Gemini and that needs file uploads redacted intact, a hosting region of its choice, and a trial it can start today.

The complete list

A closer look at your shortlist.

See who each option is best for. Expand a row for the full product overview.

Aona AIBuilt for employee AI securityAny organisation whose employees use ChatGPT, Copilot, Claude or Gemini and that needs file uploads redacted intact, a hosting region of its choice, and a trial it can start today.
Workforce AI Security you can start today: a browser plugin for Chrome, Edge, Firefox and Safari plus a native endpoint app for ChatGPT, Copilot and Claude desktop, hard block with no user override, layout-preserving DOCX, XLSX and PDF redaction on upload rather than prompt-text redaction alone, a choice of seven Aona-managed hosting regions, and AI policy templates for the EU AI Act and ISO 42001. SOC 2 Type II, self-serve 30-day trial, deployed with IT's existing tooling, first signal within hours.
Harmonic SecurityOrganisations that want prompt-text redaction and nudges across browsers and desktop AI clients, bought by demo or through AWS Marketplace.
Browser extension (Chrome, Edge and additional Chromium browsers such as Island, Arc and Comet) plus a desktop client (Claude Desktop, ChatGPT Desktop, Cursor, Codex, Claude Code, GitHub Copilot, Ollama) with real-time prompt redaction and an MCP gateway. SOC 2 Type 2, ISO 27001:2022 and ISO 42001:2023 listed in its trust centre. Packaged as three tiers (Explore, Guide, Command), demo-led, with no self-serve trial as of September 2026.
WitnessAIOrganisations that want AI controls applied in a network path they already route traffic through.
Network-based AI security and governance that observes and controls AI traffic without browser extensions or endpoint clients; desktop AI apps are covered when their traffic is routed through it. An Instant Demo product tour stands in for a self-serve trial, as of September 2026.
Prompt SecurityOrganisations that want employee and application AI security bought together through the SentinelOne Singularity platform.
GenAI security platform from SentinelOne, built into the Singularity platform: employee AI controls with anonymisation and coaching, an LLM firewall for applications, and an AI endpoint agent for local LLMs and MCP servers (February 2026). Sold by demo, with no self-serve trial as of September 2026.
Nightfall AIOrganisations whose first need is DLP across SaaS data at rest, with AI uploads governed by the same detectors.
DLP platform with SaaS API connectors (Slack, Microsoft 365, Google Drive, Salesforce), a browser extension (Chrome, Edge, Arc, Brave, Vivaldi, Comet), macOS and Windows endpoint agents installed via MDM, and an MCP Gateway in early access (September 2026). Data is stored in the United States, and evaluation runs as a proof of value rather than a self-serve trial.
Microsoft PurviewMicrosoft 365 estates that want Copilot and Microsoft 365 data governed inside the Purview licensing model.
Microsoft's data security and compliance suite. Its AI controls run in the browser (the Purview extension is required for Chrome endpoint DLP on Windows), prompt and response visibility for third-party AI sites requires E5-class licensing plus pay-as-you-go billing, and locally installed AI apps are reached through a network data security path (Entra Global Secure Access or a SASE partner, partly in preview).

Deployment context

How Aona fits your security stack.

Aona secures employee AI use alongside your existing security tools. See how its device-level controls fit with the other products in your stack.

Read the full Aona vs Harmonic Security comparison →

Coverage needs the Aona plugin or endpoint app on the device. There is no agentless or network-only mode, so personal and unmanaged devices are out of scope.
No iOS or Android coverage: AI use on phones is out of scope.
AI agent and MCP inspection ships in limited rollout on the native endpoint app, not general availability.
Aona has a SOC 2 Type II examination report. No FedRAMP, IRAP or ISO 27001 today.
Aona has no MCP gateway. Agent and MCP traffic is inspected on the endpoint app, not through a proxy.

Your questions

Harmonic Security alternatives, answered.

Answers to help you build your shortlist.

What are the best Harmonic Security alternatives in 2026?

Alternatives to Harmonic Security for securing employee AI use include Aona AI, WitnessAI, Prompt Security, Nightfall AI and Microsoft Purview. Aona AI is built for securing employee AI use: it inspects the prompt and the upload on the device, in the browser and in ChatGPT, Copilot and Claude desktop apps, with hard block, layout-preserving file redaction and real-time coaching, and it starts with a self-serve 30-day trial. Harmonic's documented redaction is real-time prompt text and its evaluation path is demo-led with no self-serve trial, which is where it stops for a buyer who wants file redaction and a trial that starts today.

Why is Aona AI a strong alternative to Harmonic Security?

Both Aona and Harmonic run a browser extension and a desktop client for employee AI use. Aona adds hard block with no user override, layout-preserving redaction of DOCX, XLSX and PDF uploads (Harmonic documents real-time prompt redaction, not file or document redaction), a choice of seven Aona-managed hosting regions, AI policy templates for the EU AI Act and ISO 42001, and real-time coaching. Aona is SOC 2 Type II certified, exports to Microsoft Sentinel via OCSF, and starts with a 30-day self-serve trial with a first signal within hours.

Where does Aona stop, compared with Harmonic Security?

Scope, stated plainly: Coverage needs the Aona plugin or endpoint app on the device. There is no agentless or network-only mode, so personal and unmanaged devices are out of scope. No iOS or Android coverage: AI use on phones is out of scope. AI agent and MCP inspection ships in limited rollout on the native endpoint app, not general availability. Aona has a SOC 2 Type II examination report. No FedRAMP, IRAP or ISO 27001 today. Aona has no MCP gateway. Agent and MCP traffic is inspected on the endpoint app, not through a proxy. These lines are carried from our own Aona vs Harmonic Security comparison, so you can evaluate with eyes open.

Is there a free trial to evaluate these alternatives?

Aona offers a 30-day self-serve free trial covering AI adoption analytics, shadow AI discovery, security and compliance monitoring and real-time employee coaching; it deploys with IT's existing tooling and shows a first signal within hours. Harmonic's evaluation path is a book-a-demo request or its AWS Marketplace listing, with no self-serve trial, as of September 2026.

How do I choose between these AI security vendors?

Start with Aona for employee AI use: it governs the prompt and the upload on the device, in the browser and in native desktop AI apps, with hard block, layout-preserving file redaction and coaching, in the hosting region you choose, and it is live within hours from a self-serve trial. Add an application-side LLM firewall from Prompt Security or another vendor only if you also build AI features into your own product, which Aona does not cover. Harmonic stops at prompt text and the demo: its DLP page claims real-time prompt redaction, file or document redaction is not claimed, and evaluation is demo-led with no self-serve trial, all as of September 2026.

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Scope a guided 30-day trial around your managed devices, supported prompt and file controls, and the outcomes your team needs to review. Or book a demo to work through the shortlist.

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SOC 2 Type II report · Free 30-day guided trial