HEAD TO HEAD
Bloom Security matched with Prompt Security (SentinelOne): agentic endpoint security compared
SHORT ANSWER
On our published weights Prompt Security (SentinelOne) scores higher overall, 5.45 to 4.65 out of 10. Bloom scores higher on capability rules; Prompt Security scores higher on actor trail, rollout path, cloud and workspace reach, named agent coverage and public proof; they tie on stop before it runs and verdict range. 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?
Bloom Security
Inventory and supply-chain rules for endpoint software
Rank 6 of 6 among agentic endpoint vendors
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 | Bloom Security | Prompt Security (SentinelOne) | Higher |
|---|---|---|---|---|
| Stop before it runs | 25% | 6 / 10 Defines what agents can access, execute and transmit; runtime decisions on individual actions are not detailed. Source: Bloom Security homepage · 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 | Tie |
| Verdict range | 15% | 3 / 10 Documents 2 of six verdict types: Block or deny and Remove or scale back. "Blocks malicious or policy-violating packages and skills; removes risky tools, revokes permissions and scales back overpermissioned MCP servers." Source: Bloom Security homepage · 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 | Tie |
| Capability rules | 15% | 8 / 10 Rules on what agents can access, execute and transmit, automatic scaling back of overpermissioned MCP servers, and package and skill policies across npm, Chrome Web Store and Open VSX. Source: Bloom Security homepage · 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 | Bloom |
| Actor trail | 10% | 4 / 10 Not described on the pages we read. Source: Bloom Security homepage · 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 | Prompt Security |
| Rollout path | 10% | 4 / 10 Deployment method not published. Source: Bloom Security homepage · 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 | Prompt Security |
| Cloud and workspace reach | 10% | 2 / 10 Endpoint fleet only; no cloud, SaaS or homegrown agent coverage described. Source: Bloom 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 | Prompt Security |
| Named agent coverage | 5% | 0 / 10 Names 0 of the six agents we track: none. Source: Bloom Security homepage · 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 | Prompt Security |
| Public proof | 10% | 5 / 10 SOC 2 listed and a $20 million seed round reported by Ctech (secondary); pricing and deployment detail not published. Source: Ctech by Calcalist (secondary): Bloom Security seed round (30 July 2026) · 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 | Prompt Security |
Which verdicts does each document?
| Verdict type | Bloom 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 | Documented | Not described |
- Bloom Security: "Blocks malicious or policy-violating packages and skills; removes risky tools, revokes permissions and scales back overpermissioned MCP servers."
Source: Bloom Security homepage · 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?
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 | Bloom Security | Prompt Security (SentinelOne) |
|---|---|---|
| Claude Code | Not named | Named |
| Cursor | Not named | Named |
| GitHub Copilot | Not named | Named |
| OpenAI Codex | Not named | Not named |
| Windsurf | Not named | Not named |
| Claude Desktop | Not named | Not named |
| Named | 0 of 6 | 3 of 6 |
Which should you choose?
Choose Bloom Security if you need capability rules and stop before it runs. Bloom Security is best for: Inventory and supply-chain rules for endpoint software.
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, Bloom Security or Prompt Security (SentinelOne)?
On our published weights Prompt Security (SentinelOne) scores higher overall, 5.45 to 4.65 out of 10. See the criterion table above for where each scores higher.
Which stops an agent action before it runs more fully, Bloom Security or Prompt Security (SentinelOne)?
They tie at 6. Bloom Security: Defines what agents can access, execute and transmit; runtime decisions on individual actions are not detailed. Prompt Security (SentinelOne): Governs what agents and MCP servers can do; per-tool-call enforcement is not detailed.
Do Bloom Security and Prompt Security (SentinelOne) publish prices?
Bloom Security: not published. Bloom Security publishes no pricing. Prompt Security (SentinelOne): not published. SentinelOne publishes no pricing for Prompt Security.