Prompt 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 sold on its own terms, not as a module of an endpoint platform: 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, a choice of seven Aona-managed hosting regions, and a first signal within hours. SOC 2 Type II and a self-serve 30-day trial.

Best for: Any organisation whose employees use ChatGPT, Copilot, Claude or Gemini and that needs employee AI use secured with a trial it can start today, before the first sales call.

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 employee AI use secured with a trial it can start today, before the first sales call.
Workforce AI Security sold on its own terms, not as a module of an endpoint platform: 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, a choice of seven Aona-managed hosting regions, and a first signal within hours. SOC 2 Type II and a self-serve 30-day trial.
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 since the September 2025 acquisition: employee AI controls with anonymisation and coaching across 15,000+ AI tools, 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.
Harmonic SecurityOrganisations that want prompt-text redaction and nudges across browsers and desktop AI clients, bought by demo or through AWS Marketplace.
Browser extension plus a desktop client (Claude Desktop, ChatGPT Desktop, Cursor, Codex, Claude Code, GitHub Copilot, Ollama) with real-time prompt redaction and an MCP gateway. Bought by demo or through its AWS Marketplace listing, 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, and the product is also listed on AWS Marketplace, 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.
CyberhavenOrganisations that want AI use governed as one flow inside a lineage-based endpoint DLP and insider-risk platform.
Data detection and response built on data lineage, with an endpoint agent, a standalone browser extension (May 2026) and block, warn or redact actions at the prompt and response level for AI tools. Flow, its AI-native data security product, was announced in July 2026 for release in the following quarter. There is no self-serve trial; evaluation starts with a demo request, as of September 2026.

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 Prompt Security comparison →

Aona secures employees' use of AI tools. It is not an LLM firewall, an AI-SPM tool or a red-teaming product for AI you build.
AI agent and MCP inspection ships in limited rollout on the native endpoint app, not general availability.
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.
Aona has a SOC 2 Type II examination report. No FedRAMP, IRAP or ISO 27001 today.

Your questions

Prompt Security alternatives, answered.

Answers to help you build your shortlist.

What are the best Prompt Security alternatives in 2026?

Alternatives to Prompt Security for securing employee AI use include Aona AI, Harmonic Security, WitnessAI, Nightfall AI and Cyberhaven. 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 is bought on its own with a self-serve 30-day trial. Prompt Security is sold by demo through the SentinelOne Singularity platform with no self-serve trial, which is where it stops for a buyer who wants to start today.

Why is Aona AI a strong alternative to Prompt Security?

Prompt Security covers employee AI, an LLM firewall and AI agents inside SentinelOne's Singularity platform; Aona covers employee AI use on its own terms. Aona's browser plugin and native endpoint app inspect the prompt at submit in Chrome, Edge, Firefox and Safari and in ChatGPT, Copilot and Claude desktop apps, block hard with no user override, redact DOCX, XLSX and PDF uploads with the layout intact, and coach the employee in real time, with a first signal within hours. You choose one of seven Aona-managed hosting regions, export to Microsoft Sentinel via OCSF, and start with a 30-day self-serve trial. Aona is SOC 2 Type II certified.

Where does Aona stop, compared with Prompt Security?

Scope, stated plainly: Aona secures employees' use of AI tools. It is not an LLM firewall, an AI-SPM tool or a red-teaming product for AI you build. AI agent and MCP inspection ships in limited rollout on the native endpoint app, not general availability. 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. Aona has a SOC 2 Type II examination report. No FedRAMP, IRAP or ISO 27001 today. These lines are carried from our own Aona vs Prompt 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 it with existing tooling and the first signal arrives within hours. Prompt Security is sold by demo through SentinelOne, with no self-serve trial, as of September 2026.

Is Prompt Security still independent after the SentinelOne acquisition?

No. SentinelOne announced the acquisition in August 2025 and completed it on 5 September 2025 for approximately USD 180 million; as of September 2026 the product is marketed as Prompt Security from SentinelOne and built into the Singularity platform, with no product sunset announced. The questions worth asking are about packaging on its own versus inside Singularity, support continuity and roadmap priority inside an endpoint-security platform. Aona is independent and purpose-built for Workforce AI Security, with seven Aona-managed hosting regions and a 30-day self-serve trial that you can start while those questions get answered.

Focused workforce tool or broad platform: which should I choose?

Start with Aona for employee AI use: it is the whole product, not one module, so the prompt and the upload get hard block, layout-preserving file redaction, native desktop app coverage and real-time coaching, live within hours. Add an application-side LLM firewall from Prompt Security or another vendor when you build AI features into your own product, which Aona does not cover. Prompt Security stops at the platform boundary: its employee module is packaged inside the SentinelOne Singularity platform and sold by demo with no self-serve trial, so the evaluation and the licence follow that platform's terms.

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