Best LLM Security Tools in 2026
Updated
In short: Prompt Inspector is ranked #1 of 28 as of 5 October 2026, ahead of PromptGuard and Amazon Bedrock Guardrails. The best-ranked option with a free plan is PromptGuard. The lowest first paid tier on this page is Amazon Bedrock Guardrails at $0.07/mo.
LLM security tools offer different ways to address risks in applications built around language models. Compare deployment models with the listed protections: model-abuse detection, output guardrails, and prompt injection defense, as well as PII redaction and secrets detection. Free-plan availability and paid-from pricing can help you assess access and cost alongside those capabilities. PromptGuard, Amazon Bedrock Guardrails, and Openlayer Guardrails are among the entries, with GLACIS and Lasso AI Security Platform also represented. Weigh the protections and deployment options against the risks and operating setup your application needs to address.
28 LLM security tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
5 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | Prompt InspectorWeb · Windows · Mac · Linux · Self-hosted · API | Three bars | — | 4 of 6 | Free | 6.6 | |
| 2 | PromptGuardWeb · Windows · Mac · Linux · Self-hosted · API · Extension | Three bars | — | 4 of 6 | $19/mo | 6.6 | |
| 3 | Amazon Bedrock GuardrailsWeb | Two bars | — | 1 of 6 | $0.07/mo | 6.4 | |
| 4 | Openlayer GuardrailsWeb · Self-hosted · API | Two bars | — | 1 of 6 | Free | 6.4 | |
| 5 | GLACISWeb · Self-hosted · API | Two bars | — | 1 of 6 | Free | 6.3 | |
| 6 | InferwallWindows · Mac · Linux · API | Two bars | — | — | 3 of 6 | — | 5.5 |
| 7 | Lasso AI Security PlatformWeb · API · Extension | One bar | — | — | 1 of 6 | — | 5.5 |
| 8 | Sanctum RuntimeWeb · Android · iPhone · Self-hosted · API | Two bars | — | — | 3 of 6 | — | 5.5 |
| 9 | WitnessAIWeb · Windows · API | One bar | — | — | 2 of 6 | — | 5.5 |
| 10 | Guardrails AIWeb · Self-hosted · API | One bar | — | — | 1 of 6 | — | 5.4 |
| 11 | HiddenLayer AI GuardrailsWeb · Self-hosted | One bar | — | — | 1 of 6 | $416666.67/mo | 5.4 |
| 12 | Prisma AIRS AI GatewayWeb · Self-hosted · API | One bar | — | — | 1 of 6 | — | 5.4 |
| 13 | Check Point AI GuardrailsWeb | One bar | — | — | 1 of 6 | — | 5.2 |
| 14 | GuardionAIWeb · Windows · Mac · Linux · Self-hosted · API | Two bars | — | — | 4 of 6 | — | 5.2 |
| 15 | Microsoft Custom Neural VoiceWeb | One bar | — | — | 1 of 6 | — | 5.2 |
| 16 | VotalAIWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 17 | LLM GuardNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 18 | Noma SecurityNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 19 | NVIDIA NeMo GuardrailsNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 20 | RocotalWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 21 | Straiker Defend AINo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 22 | Vigil GuardNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 23 | SecureAI GuardWeb · Self-hosted · API | One bar | — | — | 1 of 6 | $2,999/mo | 5.0 |
| 24 | ZeroTrusted AI FirewallWeb · Self-hosted | One bar | — | — | 1 of 6 | — | 5.0 |
| 25 | CyberSecEvalNo platforms listed | No signal | — | — | 0 of 6 | — | 4.9 |
Compare all 25 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Prompt injection defense | PII redaction |
|---|---|---|---|---|---|---|---|---|
| 1 | Prompt Inspector | 6.6 | Free plan | Free | Yes | — | Yes | — |
| 2 | PromptGuard | 6.6 | Free plan | $19/mo | Yes | — | — | — |
| 3 | Amazon Bedrock Guardrails | 6.4 | No | $0.07/mo | No | — | Yes | Yes |
| 4 | Openlayer Guardrails | 6.4 | Free plan | Free | Yes | — | Yes | Yes |
| 5 | GLACIS | 6.3 | Free plan | Free | Yes | — | Yes | Yes |
| 6 | Inferwall | 5.5 | No | — | — | — | Yes | Yes |
| 7 | Lasso AI Security Platform | 5.5 | No | — | — | — | Yes | Yes |
| 8 | Sanctum Runtime | 5.5 | No | — | Yes | — | — | — |
| 9 | WitnessAI | 5.5 | No | — | — | — | Yes | Yes |
| 10 | Guardrails AI | 5.4 | No | — | — | — | Yes | Yes |
| 11 | HiddenLayer AI Guardrails | 5.4 | No | $416666.67/mo | — | — | Yes | Yes |
| 12 | Prisma AIRS AI Gateway | 5.4 | No | — | — | — | Yes | Yes |
| 13 | Check Point AI Guardrails | 5.2 | No | — | — | — | Yes | Yes |
| 14 | GuardionAI | 5.2 | No | — | No | — | Yes | Yes |
| 15 | Microsoft Custom Neural Voice | 5.2 | No | — | — | — | — | — |
| 16 | VotalAI | 5.2 | No | — | — | — | Yes | Yes |
| 17 | LLM Guard | 5.1 | No | — | — | — | Yes | Yes |
| 18 | Noma Security | 5.1 | No | — | — | — | Yes | Yes |
| 19 | NVIDIA NeMo Guardrails | 5.1 | No | — | — | — | Yes | Yes |
| 20 | Rocotal | 5.1 | No | — | — | — | Yes | Yes |
| 21 | Straiker Defend AI | 5.1 | No | — | — | — | Yes | Yes |
| 22 | Vigil Guard | 5.1 | No | — | — | — | Yes | Yes |
| 23 | SecureAI Guard | 5.0 | No | $2,999/mo | No | 2,999 /mo | Yes | Yes |
| 24 | ZeroTrusted AI Firewall | 5.0 | No | — | No | — | Yes | Yes |
| 25 | CyberSecEval | 4.9 | No | — | Yes | — | — | — |
Is your app on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which LLM security tool is ranked first on Freedom251?
Prompt Inspector is ranked #1 of 28 with a score of 6.6. PromptGuard is second and Amazon Bedrock Guardrails third.
How many of these have a free plan?
4 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Amazon Bedrock Guardrails has the lowest first paid tier we found: $0.07/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.