Head to head · Checked against vendor sites, September 2026
Prompt Security (SentinelOne) vs Bloom Security: AI agent security compared
The verdict
Prompt Security scores higher overall on our weights (6.6 vs 6.0 out of 10). Prompt Security scores higher on footprint, identity and audit, maturity and breadth; Bloom Security scores higher on visibility. They tie on tool-call control and policy. Neither publishes list prices.
Prompt Security (SentinelOne)
Owner: SentinelOne (acquisition announced 5 August 2025)
Best for SentinelOne customers
Bloom Security
Best for endpoint software and extension inventory
How do Prompt Security and Bloom Security compare on each criterion?
| Criterion | Weight | Prompt Security | Bloom Security | Edge |
|---|---|---|---|---|
| Visibility | 22% | 7 | 9 | Bloom Security |
Why these scoresPrompt Security: Inventories AI tools and code assistants, including shadow AI, and maps agents and MCP servers. Bloom Security: Discovers software, extensions, AI tools and everything running on the endpoint, with who built it and what it can access. | ||||
| Tool-call control | 20% | 6 | 6 | Tie |
Why these scoresPrompt Security: Governs what agents and MCP servers can do; per-tool-call enforcement is not detailed. Bloom Security: Defines what AI agents can access, execute and transmit and scales back overpermissioned MCP servers; runtime tool-call decisions not detailed. | ||||
| Policy | 15% | 7 | 7 | Tie |
Why these scoresPrompt Security: Prevents prompt injection and data leakage for tools such as GitHub Copilot, Cursor and Claude Code. Bloom Security: Blocks malicious or policy-violating packages and skills across npm, Chrome Web Store and Open VSX. | ||||
| Identity and audit | 12% | 5 | 4 | Prompt Security |
Why these scoresPrompt Security: Agent vs human attribution not described on the pages we reviewed. Bloom Security: Not described on the pages we reviewed. | ||||
| Footprint | 13% | 6 | 4 | Prompt Security |
Why these scoresPrompt Security: Built into the SentinelOne Singularity Platform; the deployment method is not detailed. Bloom Security: Deployment method not published. | ||||
| Breadth | 8% | 8 | 5 | Prompt Security |
Why these scoresPrompt Security: Employees, developers and homegrown AI apps from testing to runtime. Bloom Security: Endpoint focused, including non-AI software. | ||||
| Maturity | 10% | 8 | 4 | Prompt Security |
Why these scoresPrompt Security: Backed by SentinelOne, which announced the acquisition on 5 August 2025; pricing not published. Bloom Security: Limited public company information; SOC 2 listed; investors and pricing not published. | ||||
| Total | 100% | 6.6 | 6.0 | Prompt Security |
How do they deploy, and what do they cost?
| Attribute | Prompt Security | Bloom Security |
|---|---|---|
| Owner | SentinelOne (acquisition announced 5 August 2025) | Not acquired |
| How it reaches devices | Part of Singularity Platform; method not published | Not published |
| Deployment detail | SentinelOne says Prompt Security deploys in minutes and is part of the Singularity Platform that protects endpoints, cloud, identity and data. The specific deployment method (browser extension, endpoint agent, IDE extension or proxy) is not detailed on the page we reviewed. | Not published on the pages we reviewed. |
| Pricing | Contact sales. Pricing is not published. | Contact sales. Pricing is not published. |
Source: SentinelOne Prompt Security page · SentinelOne press release, 5 August 2025 · prompt.security · bloom.security · Bloom about · Reviewed Sep 2026
Which should you choose?
Choose Prompt Security if
- Your priority matches our designation for Prompt Security: best for SentinelOne customers.
- Vendor maturity, public documentation and backing weigh heavily in procurement: Prompt Security scores 8 to 4.
- Your agents also run in SaaS platforms, cloud workloads or apps you build: Prompt Security scores 8 to 5.
Choose Bloom Security if
- Your priority matches our designation for Bloom Security: best for endpoint software and extension inventory.
- You need a fleet-wide inventory of AI agents, MCP servers, extensions and credentials on devices: Bloom Security scores 9 to 7.
Frequently asked questions
Which is better, Prompt Security (SentinelOne) or Bloom Security?
Prompt Security scores higher overall on our weights (6.6 vs 6.0 out of 10). Prompt Security scores higher on footprint, identity and audit, maturity and breadth; Bloom Security scores higher on visibility. They tie on tool-call control and policy. Scores are editorial assessments from public vendor material, reviewed September 2026.
Do Prompt Security (SentinelOne) and Bloom Security publish prices?
No. Neither publishes list prices, so ask both for a quote.
Do Prompt Security (SentinelOne) or Bloom Security replace EDR?
No. The tools in this guide add control over AI agent actions and work alongside EDR. Prompt Security: Part of Singularity Platform; method not published. Bloom Security: Not published.
Related
Sources
- SentinelOne Prompt Security page · Reviewed Sep 2026
- SentinelOne press release, 5 August 2025 · Reviewed Sep 2026
- prompt.security · Reviewed Sep 2026
- bloom.security · Reviewed Sep 2026
- Bloom about · Reviewed Sep 2026