HEAD TO HEAD
Noma Security matched with Prompt Security (SentinelOne): agentic endpoint security compared
SHORT ANSWER
On our published weights Noma Security scores higher overall, 6.55 to 5.45 out of 10. Noma scores higher on stop before it runs, capability rules, actor trail, rollout path and cloud and workspace reach; Prompt Security scores higher on verdict range; they tie on named agent coverage and public proof. Which fits depends on which of those criteria matters most to you.
By The Agent Desk · Agentic Endpoint Compare · Published 2026-10-11
Desk research from public vendor pages, press releases and standards pages read on 27 September and 11 October 2026. Editorial assessment; we did not run the products.
How do they compare at a glance?
Noma Security
One platform for endpoint, SaaS and homegrown agents
Rank 4 of 8 among broader AI security platforms
Prompt Security (SentinelOne)
SentinelOne (deal announced 5 August 2025; completion reported in September 2025)
SentinelOne Singularity estates
Rank 8 of 8 among broader AI security platforms
Which scores higher on each criterion?
| Criterion | Weight | Noma Security | Prompt Security (SentinelOne) | Higher |
|---|---|---|---|---|
| Stop before it runs | 25% | 7 / 10 Blocks unauthorized and malicious agents and stops risky behavior at runtime; per-tool-call mechanics are described less specifically. Source: Noma Security: endpoint agents · Read 27 Sep 2026 | 6 / 10 Governs what agents and MCP servers can do; per-tool-call enforcement is not detailed. Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 | Noma |
| Verdict range | 15% | 2 / 10 Documents 1 of six verdict types: Block or deny. "Blocks unauthorized and malicious agents and stops risky behavior at runtime." Source: Noma Security: endpoint agents · Read 27 Sep 2026 | 3 / 10 Documents 2 of six verdict types: Block or deny and Mask or modify. "Prevents prompt injection and data leakage; its browser extension inspects and redacts prompts." Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 Source: Prompt Security blog: browser and endpoint sensors (updated 16 August 2026) · Read 11 Oct 2026 | Prompt Security |
| Capability rules | 15% | 7 / 10 Agent Access Control keeps a live registry of allowed agents, MCP servers and skills and enforces access policies. Source: Noma Security: endpoint agents · Read 27 Sep 2026 | 5 / 10 Maps agents and MCP servers and finds shadow MCP servers; capability rules are not itemized. Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 | Noma |
| Actor trail | 10% | 7 / 10 Inspects the identity behind each agent along with the event, the session and the data it reaches. Source: Noma Security: endpoint agents · Read 27 Sep 2026 | 5 / 10 Agent versus person attribution is not described on the pages we read. Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 | Noma |
| Rollout path | 10% | 8 / 10 Discovers endpoint agents through existing EDR or MDM with no new endpoint agent to deploy. Source: Noma Security: endpoint agents · Read 27 Sep 2026 | 6 / 10 Two resident sensors, a browser extension and a dedicated AI endpoint agent, inside the SentinelOne Singularity Platform. Source: Prompt Security blog: browser and endpoint sensors (updated 16 August 2026) · Read 11 Oct 2026 | Noma |
| Cloud and workspace reach | 10% | 9 / 10 Covers endpoint, SaaS and homegrown agents, with AI-SPM across cloud, SaaS and developer environments. Source: Noma Security homepage · Read 27 Sep 2026 | 6 / 10 Covers homegrown AI apps from testing to runtime as well as employee and developer AI use. Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 | Noma |
| Named agent coverage | 5% | 5 / 10 Names 3 of the six agents we track: Claude Code, Cursor and OpenAI Codex. Source: Noma Security: endpoint agents · Read 27 Sep 2026 | 5 / 10 Names 3 of the six agents we track: Claude Code, Cursor and GitHub Copilot. Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 | Tie |
| Public proof | 10% | 8 / 10 Lists a 12-month contract at $200,000 on AWS Marketplace (marketplace list price; no pricing on noma.security), announced a $100M Series B on 31 July 2025, and lists SOC 2, ISO 27001, ISO 9001 and HIPAA. Source: AWS Marketplace: Noma Security Platform · Read 11 Oct 2026 | 8 / 10 Backed by SentinelOne, which announced the acquisition on 5 August 2025; pricing not published. Source: SentinelOne press release: agreement to acquire Prompt Security (5 August 2025) · Read 27 Sep 2026 | Tie |
Which verdicts does each document?
| Verdict type | Noma Security | Prompt Security (SentinelOne) |
|---|---|---|
| Block or deny | Documented | Documented |
| Ask a person | Not described | Not described |
| Alert or warn | Not described | Not described |
| Mask or modify | Not described | Documented |
| Simulate first | Not described | Not described |
| Remove or scale back | Not described | Not described |
- Noma Security: "Blocks unauthorized and malicious agents and stops risky behavior at runtime."
Source: Noma Security: endpoint agents · Read 27 Sep 2026
- Prompt Security (SentinelOne): "Prevents prompt injection and data leakage; its browser extension inspects and redacts prompts."
Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026
Source: Prompt Security blog: browser and endpoint sensors (updated 16 August 2026) · Read 11 Oct 2026
How does each reach devices?
Noma Security
Through existing EDR or MDM, with no new endpoint agent to deploy (endpoint discovery).
Source: Noma Security: endpoint agents · Read 27 Sep 2026
Prompt Security (SentinelOne)
Two local sensors, a browser extension and a dedicated AI endpoint agent, built into the SentinelOne Singularity Platform.
Source: Prompt Security blog: browser and endpoint sensors (updated 16 August 2026) · Read 11 Oct 2026
Which agents does each name?
| Agent | Noma Security | Prompt Security (SentinelOne) |
|---|---|---|
| Claude Code | Named | Named |
| Cursor | Named | Named |
| GitHub Copilot | Not named | Named |
| OpenAI Codex | Named | Not named |
| Windsurf | Not named | Not named |
| Claude Desktop | Not named | Not named |
| Named | 3 of 6 | 3 of 6 |
Which should you choose?
Choose Noma Security if you need cloud and workspace reach and rollout path. Noma Security is best for: One platform for endpoint, SaaS and homegrown agents.
Choose Prompt Security (SentinelOne) if you need public proof and stop before it runs. Prompt Security (SentinelOne) is best for: SentinelOne Singularity estates.
Frequently asked questions
Which is better for agentic endpoint security, Noma Security or Prompt Security (SentinelOne)?
On our published weights Noma Security scores higher overall, 6.55 to 5.45 out of 10. See the criterion table above for where each scores higher.
Which stops an agent action before it runs more fully, Noma Security or Prompt Security (SentinelOne)?
Noma Security scores higher on stopping an action before it runs (7 to 6). Noma Security: Blocks unauthorized and malicious agents and stops risky behavior at runtime; per-tool-call mechanics are described less specifically. Prompt Security (SentinelOne): Governs what agents and MCP servers can do; per-tool-call enforcement is not detailed.
Do Noma Security and Prompt Security (SentinelOne) publish prices?
Noma Security: AWS Marketplace list price: $200,000 per 12 months (Noma Security Platform, 12-month contract). Marketplace list price. noma.security publishes no pricing (its /pricing page returns Page Not Found). Prompt Security (SentinelOne): not published. SentinelOne publishes no pricing for Prompt Security.