Best AI Guardrail Software in 2026
Updated
In short: PromptGuard is ranked #1 of 21 as of 8 October 2026, ahead of Amazon Bedrock Guardrails and Enkrypt AI Guardrails. The best-ranked option with a free plan is Enkrypt AI Guardrails. The lowest first paid tier on this page is Amazon Bedrock Guardrails at $0.07/mo.
AI guardrail software can help you define protections for AI prompts, outputs, and data. Compared on custom policies, deployment, jailbreak detection, prompt injection defense, PII detection, and SDK languages, these entries give you several ways to assess safeguards and integration fit. Free-plan availability and paid-from pricing add cost context. PromptGuard, Amazon Bedrock Guardrails, and Enkrypt AI Guardrails are among the products to compare. Consider which risks matter in your use case, where controls need to run, and which development languages your stack uses; check each product’s details against those requirements.
21 AI guardrail software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
8 of the 21 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 | PromptGuardWeb · Windows · Mac · Linux · Self-hosted · API · Extension | Three bars | — | 4 of 6 | $19/mo | 6.6 | |
| 2 | Amazon Bedrock GuardrailsWeb | Two bars | — | 1 of 6 | $0.07/mo | 6.4 | |
| 3 | Enkrypt AI GuardrailsWeb · Self-hosted · API | Two bars | — | 1 of 6 | $134/mo | 6.4 | |
| 4 | Fiddler GuardrailsWeb · Self-hosted · API | Two bars | — | 1 of 6 | Free | 6.4 | |
| 5 | Openlayer GuardrailsWeb · Self-hosted · API | Two bars | — | 1 of 6 | Free | 6.4 | |
| 6 | OpenSecureAI Prompt FirewallWeb · Self-hosted | Two bars | — | 1 of 6 | $49/mo | 6.4 | |
| 7 | PII FirewallLinux · Self-hosted | Two bars | — | 1 of 6 | Free | 6.3 | |
| 8 | HiddenLayer AI Runtime SecurityWeb · Linux · Self-hosted · API | One bar | — | — | 2 of 6 | — | 5.5 |
| 9 | Check Point AI GuardrailsWeb · Self-hosted · API | One bar | — | — | 1 of 6 | — | 5.4 |
| 10 | Guardrails AIWeb · Self-hosted · API | One bar | — | — | 1 of 6 | — | 5.4 |
| 11 | OpenAI GuardrailsWeb · Self-hosted · API | One bar | — | — | 1 of 6 | — | 5.4 |
| 12 | Oracle Mobile AuthenticatorWindows · Android · iPhone | Two bars | — | — | 3 of 6 | — | 5.4 |
| 13 | Pangea AI GuardSelf-hosted · API · Extension | One bar | — | — | 0 of 6 | — | 5.4 |
| 14 | VotalAIWeb · Self-hosted · API | One bar | — | — | 1 of 6 | — | 5.4 |
| 15 | Microsoft Custom Neural VoiceWeb | One bar | — | — | 1 of 6 | — | 5.2 |
| 16 | Amazon Nova ReelWeb · API | One bar | — | — | 1 of 6 | — | 5.1 |
| 17 | Radware AlteonWeb · Linux · Self-hosted · API | One bar | — | — | 2 of 6 | — | 5.1 |
| 18 | NVIDIA NeMo GuardrailsNo platforms listed | No signal | — | — | 0 of 6 | — | 5.0 |
| 19 | OpenGuardrailsWeb · Self-hosted · API | One bar | — | — | 1 of 6 | $10/mo | 5.0 |
| 20 | CyberSecEvalLinux · Self-hosted · API | One bar | — | 1 of 6 | Free | 4.9 | |
| 21 | LLM GuardNo platforms listed | No signal | — | — | 0 of 6 | — | 4.8 |
Compare all 21 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Deployment | Prompt injection defense |
|---|---|---|---|---|---|---|---|---|
| 1 | PromptGuard | 6.6 | Free plan | $19/mo | Yes | — | — | — |
| 2 | Amazon Bedrock Guardrails | 6.4 | No | $0.07/mo | No | — | — | — |
| 3 | Enkrypt AI Guardrails | 6.4 | Free plan | $134/mo | Yes | 134 /mo | — | Yes |
| 4 | Fiddler Guardrails | 6.4 | Free plan | Free | Yes | — | hybrid | Yes |
| 5 | Openlayer Guardrails | 6.4 | Free plan | Free | Yes | — | hybrid | Yes |
| 6 | OpenSecureAI Prompt Firewall | 6.4 | Free plan | $49/mo | Yes | 49 /mo | hybrid | Yes |
| 7 | PII Firewall | 6.3 | Free plan | Free | — | — | self_hosted | No |
| 8 | HiddenLayer AI Runtime Security | 5.5 | No | — | — | — | hybrid | Yes |
| 9 | Check Point AI Guardrails | 5.4 | No | — | — | — | — | — |
| 10 | Guardrails AI | 5.4 | No | — | — | — | — | — |
| 11 | OpenAI Guardrails | 5.4 | No | — | — | — | hybrid | Yes |
| 12 | Oracle Mobile Authenticator | 5.4 | No | — | Yes | — | — | — |
| 13 | Pangea AI Guard | 5.4 | No | — | Yes | — | hybrid | Yes |
| 14 | VotalAI | 5.4 | No | — | — | — | — | — |
| 15 | Microsoft Custom Neural Voice | 5.2 | No | — | — | — | — | — |
| 16 | Amazon Nova Reel | 5.1 | No | — | No | — | — | — |
| 17 | Radware Alteon | 5.1 | No | — | — | — | cloud | Yes |
| 18 | NVIDIA NeMo Guardrails | 5.0 | No | — | — | — | — | — |
| 19 | OpenGuardrails | 5.0 | No | $10/mo | No | 10 /mo | hybrid | Yes |
| 20 | CyberSecEval | 4.9 | Free plan | Free | Yes | — | — | — |
| 21 | LLM Guard | 4.8 | No | — | — | — | — | — |
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 AI guardrail software is ranked first on Freedom251?
PromptGuard is ranked #1 of 21 with a score of 6.6. Amazon Bedrock Guardrails is second and Enkrypt AI Guardrails third.
How many of these have a free plan?
7 of the 21 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.