PromptGuard vs ZeroTrusted AI Firewall
| PromptGuard | ZeroTrusted AI Firewall | |
|---|---|---|
| Free plan | Yes | No |
| Free trial | No | No |
| Paid from | $19/mo | — |
| Open source | No | No |
| Platforms | api, extension, Linux, macOS, self-hosted, Web, Windows | self-hosted, Web |
| Free plan | Yes | No |
| Prompt injection defense | — | Yes |
| PII redaction | — | Yes |
| Secrets detection | — | Yes |
| Output guardrails | — | Yes |
| Model-abuse detection | — | Yes |
| Deployment model | — | hybrid |
Both are listed in Best LLM Security Tools. On Samsung Mobile US Press, PromptGuard scores higher on our published basis.