All analysis was generated autonomously, without human review. Scores are analytical opinions drawn from the cited public sources, without hands-on testing. They are not audits, certifications, investment reports, purchasing advice, or evaluations of quality.
PromptArmor focuses on assessing the AI a company's vendors run, giving third-party-risk, security, privacy, and legal teams a way to review the apps, agents, and connectors a supplier has adopted and to get alerted when a vendor changes how it uses AI or customer data. The early demand is real for a company this young: HubSpot's security team uses it to speed AI vendor reviews, and it built its name by publicly disclosing a 2024 Slack AI bug, covered by Dark Reading and The Register, that let attackers steal data from private channels. Its edge today is being early and research-credible, not a durable lock: the vendor-risk platforms it connects into could add the same checks to tools buyers already own.
| Description | PromptArmor sells an AI risk intelligence platform that helps security and third-party-risk teams review the AI their vendors run, discovering the AI apps, agents, MCP servers, and connectors in use, scoring their risk against recognized standards, and testing for indirect prompt injection. | [f1] |
|---|---|---|
| Founded | 2023 | [f2] |
| HQ | San Francisco, California, US | [f2] |
| Product | What it does |
|---|---|
| PromptArmor | Discovers the AI apps, agents, MCP servers, and connectors a company's vendors run, scores their risk, tests for indirect prompt injection, and monitors vendors for AI changes. |
AI Defense Matrix
| Govern | Identify | Protect | Detect | Respond | Recover | |
|---|---|---|---|---|---|---|
| AI-Workload Platforms Inference servers, training platforms, vector DB platforms, and the model-loading supply chain. | ||||||
| AI Orchestration Tools Agentic orchestration tools, plus their plugins, skills, hooks, system prompts, scaffolding, harnesses, configuration settings, and MCP clients on user devices. | ||||||
| AI-Generated Code Code produced by AI tools, AI-assisted reviews, AI-generated infrastructure-as-code and tests, and vibe-coded apps that bypass CI/CD. | ||||||
| AI Gateways & Routers MCP proxies and gateways, LLM routers, outbound AI-service traffic, shadow AI egress, and model-registry traffic. | ||||||
| AI Model Model weights, fine-tuning checkpoints, model cards, registries, AIBOM, and the third-party LLMs your enterprise consumes. | ||||||
| Training Data Datasets used for training, fine-tuning, and continued learning. | ||||||
| Runtime AI Data User prompts, inference inputs, RAG content, vector DB content, persistent agent memory, and interaction history. | ||||||
| AI Agent Identities AI agents as non-human principals, plus credentials, keys, permission scopes, service accounts, and delegation chains across agents and tools. |
PromptArmor discovers the AI applications, agents, MCP servers, and connectors that vendors run, scores their risk across 26 vectors mapped to NIST AI RMF, OWASP LLM Top 10, and MITRE ATLAS, and tests vendor AI for indirect prompt injection. These capabilities are mapped to the AI Defense Matrix. [f3]
How well the company can compete in its security market, scored across eight dimensions against public evidence.
| Dimension | Score |
|---|---|
| Problem Clarity How precisely the company defines its problem, with evidence the problem exists at the scale claimed. | 3/5 |
| Capability Depth How specific the technical capabilities are, with evidence beyond marketing claims such as docs, demos, and third-party validation. | 3/5 |
| Market Timing Whether the market is ready for this product, with evidence that buyers are actively seeking solutions. | 3/5 |
| Team Credibility Demonstrated domain expertise with public signals such as prior exits, publications, and industry recognition. | 3/5 |
| GTM Proof Evidence of actual traction (customers, revenue signals, partnerships) beyond stated intentions. | 3/5 |
| Funding Efficiency Whether funding matches go-to-market ambition, with signs of capital-efficient growth. | 3/5 |
| Category Clarity Whether the company creates or fits a recognizable category that buyers can quickly place in their stack. | 3/5 |
| Incumbent Defensibility How vulnerable the core value proposition is to absorption as a feature by a platform vendor. | 3/5 |
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The reasoning for the scores, the strategy deep dive, the business risks, and more. AI access comes with the purchase, so your AI tools can read the full profile too. You keep 12 months of access.
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A closer look at the company's product strategy, measuring how defensible it is against market forces and examining the eight areas behind it.
pivot urgently
| Dimension | Score |
|---|---|
| Value Delivery Does the product sell software as the product, or judgment, trust, or accountability with software as the delivery mechanism. | 1/3 |
| Switching Cost How expensive leaving is for a customer: data portability, integrations, learned workflows, network effects, regulatory data residency. | 2/3 |
| Compliance Moat Whether certifications, liability acceptance, or audit trails block an easy replacement. | 1/3 |
| Problem Complexity Whether the product requires ML, optimization, real-time systems, or years of specialized expertise. | 3/3 |
| Buyer Profile Whether buyers are SMB operators, mid-market IT teams, or regulated enterprises and governments with procurement gates. | 2/3 |
| Layer Whether the product is an end-user application, a platform with application features, or infrastructure other applications depend on. | 2/3 |
| Proprietary Data, Content, or IP Whether the product accumulates datasets, content licenses, or IP that a rival cannot recreate from scratch. | 1/3 |
Unlock the Full Analysis
The reasoning for the scores, the strategy deep dive, the business risks, and more. AI access comes with the purchase, so your AI tools can read the full profile too. You keep 12 months of access.
One-time purchase: $20 per profile.
UnlockReading several? Unlock the entire catalog.
| Id | Source | Tier | Accessed |
|---|---|---|---|
| f1 | PromptArmor homepage (AI Risk Intelligence) | official | 2026-07-06 |
| f2 | PromptArmor Y Combinator profile (Winter 2024 batch, San Francisco); domain promptarmor.com created 2023-08-04 (WHOIS) | other | 2026-07-06 |
| f3 | AI Defense Matrix Catalog mapping (aligned to catalog) | other | 2026-07-06 |
| Id | Source | Tier | Accessed |
|---|---|---|---|
| s1 | PromptArmor homepage (AI Risk Intelligence) “Full vendor reports with AI-specific risk scores across 26 risk vectors, mapped to NIST AI RMF, OWASP LLM Top 10, and MITRE Atlas.” | official | 2026-07-06 |
| s2 | PromptArmor Security Practices page “PromptArmor maintains SOC 2 Type II certification. We undergo regular third-party penetration testing and vulnerability assessments.” | official | 2026-07-06 |
| s3 | PromptArmor Trust Center (SOC 2 Type 2, penetration testing) “Penetration testing performed within the last 12 months” | official | 2026-07-06 |
| s4 | PromptArmor: HubSpot Claude Implementation Case Study “PromptArmor was essential in allowing our security team to quickly turn around an assessment of Claude during vendor due diligence, and also to help with efficient secure rollout afterwards, to accelerate adoption.” | official | 2026-07-06 |
| s5 | PromptArmor: Data Exfiltration from Slack AI via Indirect Prompt Injection “Slack AI is susceptible to data exfiltration via indirect prompt injection from a public channel.” | official | 2026-07-06 |
| s6 | Dark Reading: Slack Patches AI Bug That Let Attackers Steal Data From Private Channels “PromptArmor on Aug. 14 disclosed the flaw to Slack, and worked together with the company over the course of about a week to clarify the issue.” | press | 2026-07-06 |
| s7 | PromptArmor Y Combinator profile (LLM Security and Compliance, Winter 2024, San Francisco) “Y Combinator Winter 2024” | other | 2026-07-06 |
| s8 | AI Defense Matrix Catalog: PromptArmor product page “AI risk intelligence platform that discovers AI in third-party vendors, scores its risk against frameworks, tests for indirect prompt injection, and monitors vendors for AI changes.” | other | 2026-07-06 |
| s9 | The Register: Slack AI can be tricked into leaking data from private channels via prompt injection “Slack AI, an add-on assistive service available to users of Salesforce's team messaging service, is vulnerable to prompt injection, according to security firm PromptArmor.” | press | 2026-07-06 |
| Id | Source | Tier | Accessed |
|---|---|---|---|
| s1 | PromptArmor homepage (AI Risk Intelligence) “Full vendor reports with AI-specific risk scores across 26 risk vectors, mapped to NIST AI RMF, OWASP LLM Top 10, and MITRE Atlas.” | official | 2026-07-06 |
| s2 | PromptArmor Security Practices page “PromptArmor maintains SOC 2 Type II certification. We undergo regular third-party penetration testing and vulnerability assessments.” | official | 2026-07-06 |
| s3 | PromptArmor Trust Center (SOC 2 Type 2, penetration testing) “Penetration testing performed within the last 12 months” | official | 2026-07-06 |
| s4 | PromptArmor: HubSpot Claude Implementation Case Study “PromptArmor was essential in allowing our security team to quickly turn around an assessment of Claude during vendor due diligence, and also to help with efficient secure rollout afterwards, to accelerate adoption.” | official | 2026-07-06 |
| s5 | PromptArmor: Data Exfiltration from Slack AI via Indirect Prompt Injection “Slack AI is susceptible to data exfiltration via indirect prompt injection from a public channel.” | official | 2026-07-06 |
| s6 | Dark Reading: Slack Patches AI Bug That Let Attackers Steal Data From Private Channels “PromptArmor on Aug. 14 disclosed the flaw to Slack, and worked together with the company over the course of about a week to clarify the issue.” | press | 2026-07-06 |
| s7 | PromptArmor Y Combinator profile (LLM Security and Compliance, Winter 2024, San Francisco) “Y Combinator Winter 2024” | other | 2026-07-06 |
| s8 | AI Defense Matrix Catalog: PromptArmor product page “AI risk intelligence platform that discovers AI in third-party vendors, scores its risk against frameworks, tests for indirect prompt injection, and monitors vendors for AI changes.” | other | 2026-07-06 |
| s9 | The Register: Slack AI can be tricked into leaking data from private channels via prompt injection “Slack AI, an add-on assistive service available to users of Salesforce's team messaging service, is vulnerable to prompt injection, according to security firm PromptArmor.” | press | 2026-07-06 |
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