Best AI Guardrail Software in 2026
Updated
When you add AI guardrails to a product or workflow, the right fit depends on where policies run and what risks they can catch. Compare custom policies, deployment options, jailbreak detection, prompt injection defense and PII detection, alongside SDK languages and whether a free plan is available or paid access has a starting price. The entries are ranked, with Enkrypt AI Guardrails, Pangea AI Guard and Fiddler Guardrails among those near the top. Use those criteria to weigh how each option could fit your stack and the protections you need, rather than treating the ranking as a substitute for checking specific requirements.
AI Guardrail Software, one module each.A lit port is something its maker publishes; 16 of 16 with a known API signal have a public API.
- 01 Enkrypt AI Guardrails API yesFREE yesDOCS 7.4$134/mo
- 02 Fiddler Guardrails API yesFREE yesDOCS 7.3Free
- 03 Openlayer Guardrails API yesFREE yesDOCS 7.3Free
- 04 PromptGuard API yesFREE yesDOCS 7.3$19/mo
- 05 CyberSecEval API yesFREE yesDOCS 7.2Free
- 06 NVIDIA NeMo Guardrails API yesFREE yesDOCS 7.2Free
- 07 LLM Guard API yesFREE yesDOCS 7.1Free
- 08 HiddenLayer AI Runtime Security API yesDOCS 7.0
- 09 Pangea AI Guard API yesDOCS 7.0
- 10 Guardrails AI API yesDOCS 6.9
- 11 OpenAI Guardrails API yesDOCS 6.9
- 12 VotalAI API yesDOCS 6.9
- 13 Amazon Nova ReelAmazon Web Services API yesDOCS 6.8
- 14 Check Point AI Guardrails API yesDOCS 6.8
- 15 OpenGuardrails API yesFREE noDOCS 6.8$10/mo
- 16 Radware Alteon API yesDOCS 6.8
- 17 OpenSecureAI Prompt Firewall FREE yesDOCS 6.0$49/mo
- 18 Amazon Bedrock Guardrails FREE yesDOCS 5.9$0.07/mo
- 19 Oracle Mobile Authenticator FREE yesDOCS 5.9Free
- 20 PII Firewall FREE yesDOCS 5.8Free
- 21 Microsoft Custom Neural Voice DOCS 5.2
Compare all 21 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | Deployment | Prompt injection defense |
|---|---|---|---|---|---|---|---|---|
| 1 | Enkrypt AI Guardrails | 7.4 | Free plan | $134/mo | Yes | 134 /mo | Yes | |
| 2 | Fiddler Guardrails | 7.3 | Free plan | Free | Yes | hybrid | Yes | |
| 3 | Openlayer Guardrails | 7.3 | Free plan | Free | Yes | hybrid | Yes | |
| 4 | PromptGuard | 7.3 | Free plan | $19/mo | Yes | |||
| 5 | CyberSecEval | 7.2 | Free plan | Free | Yes | |||
| 6 | NVIDIA NeMo Guardrails | 7.2 | Free plan | Free | ||||
| 7 | LLM Guard | 7.1 | Free plan | Free | ||||
| 8 | HiddenLayer AI Runtime Security | 7.0 | hybrid | Yes | ||||
| 9 | Pangea AI Guard | 7.0 | Yes | hybrid | Yes | |||
| 10 | Guardrails AI | 6.9 | ||||||
| 11 | OpenAI Guardrails | 6.9 | hybrid | Yes | ||||
| 12 | VotalAI | 6.9 | ||||||
| 13 | Amazon Nova Reel | 6.8 | No | |||||
| 14 | Check Point AI Guardrails | 6.8 | ||||||
| 15 | OpenGuardrails | 6.8 | No | $10/mo | No | 10 /mo | hybrid | Yes |
| 16 | Radware Alteon | 6.8 | cloud | Yes | ||||
| 17 | OpenSecureAI Prompt Firewall | 6.0 | Free plan | $49/mo | Yes | 49 /mo | hybrid | Yes |
| 18 | Amazon Bedrock Guardrails | 5.9 | $0.07/mo | No | ||||
| 19 | Oracle Mobile Authenticator | 5.9 | Free plan | Free | Yes | |||
| 20 | PII Firewall | 5.8 | Free plan | Free | self_hosted | No | ||
| 21 | Microsoft Custom Neural Voice | 5.2 |
Is your platform on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.