Best Prompt Inspector Alternatives in 2026
The top Prompt Inspector alternatives are Guardrails AI, LLM Guard and NVIDIA NeMo Guardrails: 15 LLM security tools our editors would look at instead of Prompt Inspector, in our ranking order.
Prompt Inspector: A focused prompt-injection defense layer with flexible deployment and developer tooling. Where it falls short: its verified protection scope is narrower than full runtime guardrail platforms.
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Best forOpen-source runtime validation and policy enforcement
A broad open-source toolkit for runtime LLM validation, policy enforcement, and risk detection.
- Secrets detection
- PII redaction
- Output guardrails
9.3/10★★★★★Visit Guardrails AI -
Best forSelf-hosted prompt and output scanning
A self-hosted toolkit for scanning prompts, outputs, PII, secrets, and LLM risks.
- Secrets detection
- PII redaction
- Output guardrails
9.2/10★★★★★Visit LLM Guard -
Best forTeams wanting broad open-source guardrails
A broad, self-hosted toolkit for controlling inputs, outputs, tools, and AI-agent behavior.
- PII redaction
- Output guardrails
- Prompt injection defense
9.1/10★★★★★Visit NVIDIA -
Best forAWS-centric teams needing managed guardrails
A broad managed guardrail layer for teams building around Amazon Bedrock.
- Secrets detection
- PII redaction
- Output guardrails
9.0/10★★★★☆Visit AWS -
Best forAffordable teams needing LLM red teaming
Affordable LLM red teaming with broad integrations and CI/CD testing.
8.9/10★★★★☆Visit PromptGuard -
Best forEnterprises securing agents and AI supply chains
A broad enterprise platform for discovering, governing, testing, and protecting AI systems.
- Model-abuse detection
- Secrets detection
- PII redaction
8.8/10★★★★☆Visit Noma Security -
Best forOrganizations needing governed AI activity visibility
A broad control layer for governing employee, application, agent, and MCP activity.
- Model-abuse detection
- Secrets detection
- PII redaction
8.7/10★★★★☆Visit WitnessAI -
Best forTeams protecting multimodal agents and MCP
A runtime defense layer for teams securing multimodal agents and MCP connections.
- Model-abuse detection
- Secrets detection
- PII redaction
8.6/10★★★★☆Visit Straiker -
Best forSecurity teams needing broad inline AI protection
Broad inline protection for organizations running LLMs, agents, and AI APIs.
- Model-abuse detection
- Secrets detection
- PII redaction
8.5/10★★★★☆Visit ZeroTrusted.ai -
Best forMature enterprises needing AI gateway controls
A broad AI security platform for runtime inspection, guardrails and gateway enforcement.
- Secrets detection
- PII redaction
- Output guardrails
8.4/10★★★★☆Visit Prisma AIRS -
Best forSecurity teams needing broad AI threat monitoring
Broad AI threat monitoring with guardrails, telemetry, and enterprise deployment controls.
- Model-abuse detection
- Secrets detection
- PII redaction
8.3/10★★★★☆Visit GuardionAI -
Best forNewer teams needing AI discovery and red teaming
A broad AI security platform for discovery, runtime defense, governance, and red teaming.
- Model-abuse detection
- Secrets detection
- PII redaction
8.2/10★★★★☆Visit Lasso Security -
Best forTeams needing identity-aware agent guardrails
Identity-aware guardrails for securing prompts, outputs, tools, and agent actions.
- Secrets detection
- PII redaction
- Output guardrails
8.1/10★★★★☆Visit VotalAI -
Best forEnterprises needing agent and MCP controls
A broad runtime defense layer for enterprise LLM apps, agents, and MCP workflows.
- PII redaction
- Output guardrails
- Prompt injection defense
8.0/10★★★★☆Visit Check Point -
Best forTeams wanting free hybrid runtime policy controls
A hybrid runtime control layer for governing AI actions and recording decisions.
- PII redaction
- Output guardrails
- Prompt injection defense
7.9/10★★★★☆Visit GLACIS
Prompt Inspector Alternatives: Common Questions
What is the best alternative to Prompt Inspector?
Guardrails AI: #1 in our LLM Security Tools ranking, with an editor score of 9.3 out of 10. A broad open-source toolkit for runtime LLM validation, policy enforcement, and risk detection.
Is there a free alternative to Prompt Inspector?
Yes. Guardrails AI, LLM Guard, NVIDIA NeMo Guardrails, PromptGuard and GLACIS have a free plan or a free tier.
Prompt Inspector vs Each Alternative
| # | Tool | Free plan | Paid from | Prompt injection defense | PII redaction | Secrets detection | Output guardrails | Score |
|---|---|---|---|---|---|---|---|---|
| 23 | Prompt Inspector | Yes | — | Yes | — | — | — | 6.8 |
| 1 | Guardrails AI | — | None | Yes | Yes | Yes | Yes | 9.3 |
| 2 | LLM Guard | — | None | Yes | Yes | Yes | Yes | 9.2 |
| 3 | NVIDIA NeMo Guardrails | — | None | Yes | Yes | — | Yes | 9.1 |
| 4 | Amazon Bedrock Guardrails | No | $0/unit usage-based | Yes | Yes | Yes | Yes | 9.0 |
| 5 | PromptGuard | Yes | $19/seat/mo | — | — | — | — | 8.9 |
| 6 | Noma Security | — | — | Yes | Yes | Yes | Yes | 8.8 |
| 7 | WitnessAI | — | — | Yes | Yes | Yes | Yes | 8.7 |
| 8 | Straiker Defend AI | — | — | Yes | Yes | Yes | Yes | 8.6 |
| 9 | ZeroTrusted AI Firewall | No | — | Yes | Yes | Yes | Yes | 8.5 |
| 10 | Prisma AIRS | — | — | Yes | Yes | Yes | Yes | 8.4 |
| 11 | GuardionAI | No | — | Yes | Yes | Yes | Yes | 8.3 |
| 12 | Lasso AI Security Platform | — | — | Yes | Yes | Yes | Yes | 8.2 |
| 13 | VotalAI | — | — | Yes | Yes | Yes | Yes | 8.1 |
| 14 | Check Point AI Guardrails | — | — | Yes | Yes | — | Yes | 8.0 |
| 15 | GLACIS | Yes | — | Yes | Yes | — | Yes | 7.9 |
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update