# Onyx Platform vs Plainsea Agentic Penetration Testing Platform: side-by-side comparison (2026) [Onyx Platform](https://cybersectools.com/tools/onyx-platform) is a commercial [agentic AI security](https://cybersectools.com/categories/agentic-ai-security) solution by [Onyx Security](https://cybersectools.com/companies/onyx-security). [Plainsea Agentic Penetration Testing Platform](https://cybersectools.com/tools/plainsea-agentic-penetration-testing-platform) is a commercial [penetration testing](https://cybersectools.com/categories/pentesting-tools) solution by [Plainsea](https://cybersectools.com/companies/plainsea). Features, integrations, deployment and the company behind each one, side by side. Need the answer fast? [Best Agentic AI Security Solutions for Business](https://cybersectools.com/shortlists/best-agentic-ai-security-solutions) picks CrowdStrike Falcon Guardian, Rubrik Agent Cloud, Silverfort AI Agent Security and 5 more. ## Side-by-side comparison | | Onyx Platform | Plainsea Agentic Penetration Testing Platform | |---|---|---| | Pricing model | Commercial | Commercial | | Category | Agentic AI Security | Penetration Testing | | Verified | No | No | | Deployment type | Hybrid | Cloud | | Company size fit | Mid-Market, Enterprise | Mid-Market, Enterprise | | Company | Onyx Security | Plainsea | | Headquarters | – | – | ### Use cases and capabilities | | Onyx Platform | Plainsea Agentic Penetration Testing Platform | |---|---|---| | Agentic AI Security | Yes | Yes | | AI Governance | Yes | – | | AI Observability | Yes | – | | AI SPM | Yes | – | | LLM Guardrails | Yes | – | | LLM Security | Yes | – | | MCP Security | Yes | – | | Prompt Injection | Yes | – | | Shadow AI | Yes | – | | GenAI Security | Yes | – | | AI Pentesting | – | Yes | | Penetration Testing Framework | – | Yes | | Continuous Testing | – | Yes | | Red Team | – | Yes | | Vulnerability Prioritization | – | Yes | | Security Reporting | – | Yes | | VAPT | – | Yes | | Security Validation | – | Yes | ### Core features **Onyx Platform** 10 features listed. Sign in on the page to see them. **Plainsea Agentic Penetration Testing Platform** 10 features listed. Sign in on the page to see them. ### Integrations **Onyx Platform** 11 integrations listed. Sign in on the page to see them. **Plainsea Agentic Penetration Testing Platform** No integrations listed. ## Which one fits you Based on what each listing shows: deployment, company size, price and open source. - [Onyx Platform](https://cybersectools.com/tools/onyx-platform) fits if you need both cloud and on-premises options. - [Plainsea Agentic Penetration Testing Platform](https://cybersectools.com/tools/plainsea-agentic-penetration-testing-platform) fits if you want a cloud product. ## Onyx Platform vs Plainsea Agentic Penetration Testing Platform FAQ Common questions when comparing Onyx Platform vs Plainsea Agentic Penetration Testing Platform for agentic AI security. ### What is the difference between Onyx Platform and Plainsea Agentic Penetration Testing Platform? **Onyx Platform**: AI control plane for enterprise AI agent security, governance, and observability. Built by Onyx Security. **Plainsea Agentic Penetration Testing Platform**: Agentic AI platform for continuous, full-lifecycle penetration testing. Built by Plainsea. The table above shows where their features, integrations, deployment and company size fit differ. ### Who makes Onyx Platform and Plainsea Agentic Penetration Testing Platform? **Onyx Platform** is made by Onyx Security. **Plainsea Agentic Penetration Testing Platform** is made by Plainsea. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit. ### Is Onyx Platform a good alternative to Plainsea Agentic Penetration Testing Platform? In part. Onyx Platform and Plainsea Agentic Penetration Testing Platform are not in the same category on CybersecTools. Both cover Agentic AI Security. Use the table above to see where features, deployment and company size fit differ. ## Related comparisons - [Onyx Platform vs HikmaAI](https://cybersectools.com/compare/hikmaai-vs-onyx-platform) - [Onyx Platform vs Highflame Platform](https://cybersectools.com/compare/highflame-platform-vs-onyx-platform) - [Onyx Platform vs Oryo](https://cybersectools.com/compare/onyx-platform-vs-oryo) - [Plainsea Agentic Penetration Testing Platform vs HikmaAI](https://cybersectools.com/compare/hikmaai-vs-plainsea-agentic-penetration-testing-platform) - [Plainsea Agentic Penetration Testing Platform vs Highflame Platform](https://cybersectools.com/compare/highflame-platform-vs-plainsea-agentic-penetration-testing-platform) - [Plainsea Agentic Penetration Testing Platform vs Oryo](https://cybersectools.com/compare/oryo-vs-plainsea-agentic-penetration-testing-platform) ## Alternatives to each - [See all Onyx Platform alternatives](https://cybersectools.com/alternatives/onyx-platform) - [See all Plainsea Agentic Penetration Testing Platform alternatives](https://cybersectools.com/alternatives/plainsea-agentic-penetration-testing-platform) --- Source: https://cybersectools.com/compare/onyx-platform-vs-plainsea-agentic-penetration-testing-platform For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/onyx-platform.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on Onyx Platform and Plainsea Agentic Penetration Testing Platform: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md