Best AI Guardrail Software in 2026
Updated
In short: PromptGuard is ranked #1 of 21 as of 5 October 2026, ahead of Enkrypt AI Guardrails and OpenSecureAI Prompt Firewall. 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.
Putting guardrails around AI calls for a clear view of both policy controls and the risks a product addresses. Compare custom policies and deployment with jailbreak detection, prompt injection defense and PII detection. SDK languages can help you assess integration requirements, while free-plan availability and paid-from pricing provide cost context. PromptGuard, Enkrypt AI Guardrails and OpenSecureAI Prompt Firewall are among the entries shown, along with Fiddler Guardrails and Amazon Bedrock Guardrails. Consider which protections matter for your use case and where they need to run. The listed criteria help you compare the options without assuming that any one set of controls fits every application.
21 AI guardrail software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Compare all 21 in a table
| # | Tool | Score | Free plan | From | Free plan | Paid from | Deployment | Prompt injection defense |
|---|---|---|---|---|---|---|---|---|
| 1 | PromptGuard | 7.3 | Free plan | $19/mo | Yes | — | — | — |
| 2 | Enkrypt AI Guardrails | 7.1 | Free plan | $134/mo | Yes | 134 /mo | — | Yes |
| 3 | OpenSecureAI Prompt Firewall | 7.1 | Free plan | $49/mo | Yes | 49 /mo | hybrid | Yes |
| 4 | Fiddler Guardrails | 7.0 | Free plan | Free | Yes | — | hybrid | Yes |
| 5 | Amazon Bedrock Guardrails | 6.9 | No | $0.07/mo | No | — | — | — |
| 6 | HiddenLayer AI Runtime Security | 6.9 | No | — | — | — | hybrid | Yes |
| 7 | Openlayer Guardrails | 6.9 | Free plan | Free | Yes | — | hybrid | Yes |
| 8 | Radware Alteon | 6.7 | No | — | — | — | cloud | Yes |
| 9 | Guardrails AI | 6.6 | No | — | — | — | — | — |
| 10 | OpenAI Guardrails | 6.6 | No | — | — | — | hybrid | Yes |
| 11 | Pangea AI Guard | 6.5 | No | — | Yes | — | hybrid | Yes |
| 12 | OpenGuardrails | 6.4 | No | $10/mo | No | 10 /mo | hybrid | Yes |
| 13 | Oracle Mobile Authenticator | 6.4 | No | — | Yes | — | — | — |
| 14 | Microsoft Custom Neural Voice | 6.0 | No | — | — | — | — | — |
| 15 | PII Firewall | 5.9 | Free plan | Free | — | — | self_hosted | No |
| 16 | Check Point AI Guardrails | 5.7 | No | — | — | — | — | — |
| 17 | Amazon Nova Reel | 5.6 | No | — | No | — | — | — |
| 18 | NVIDIA NeMo Guardrails | 5.3 | No | — | — | — | — | — |
| 19 | VotalAI | 5.2 | No | — | — | — | — | — |
| 20 | CyberSecEval | 5.0 | No | — | Yes | — | — | — |
| 21 | LLM Guard | 4.7 | No | — | — | — | — | — |
Is your tool 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 Specifiction?
PromptGuard is ranked #1 of 21 with a score of 7.3. Enkrypt AI Guardrails is second and OpenSecureAI Prompt Firewall third.
How many of these have a free plan?
6 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 on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.