Best ZeroTrusted AI Firewall Alternatives in 2026
The top ZeroTrusted AI Firewall alternatives are Guardrails AI, LLM Guard and NVIDIA NeMo Guardrails: 15 LLM security tools our editors would look at instead of ZeroTrusted AI Firewall, in our ranking order.
ZeroTrusted AI Firewall: Broad inline protection for organizations running LLMs, agents, and AI APIs. Where it falls short: custom enterprise pricing can make budgeting less direct.
Switching from ZeroTrusted AI Firewall? For most llm security tools buyers the best ZeroTrusted AI Firewall alternative is Guardrails AI, built for open-source runtime validation and policy enforcement. On a budget, PromptGuard starts at $19/seat/mo.
Why People Look for a ZeroTrusted AI Firewall Alternative
- Custom enterprise pricing can make budgeting less direct
- No free plan is available
- The published offering centers on one Enterprise plan
- No free plan — 3 of the alternatives below have it
Quick Picks by What You Need
- Best overallGuardrails AI9.3
Open-source runtime validation and policy enforcement
Visit Guardrails AI - Lowest pricePromptGuard8.9
Paid plans from $19/seat/mo
Visit PromptGuard - Best free optionGuardrails AI9.3
Has a free plan (ZeroTrusted AI Firewall has none)
Visit Guardrails AI
All 15 ZeroTrusted AI Firewall Alternatives, Ranked
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
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Best forOpen-source runtime validation and policy enforcement
- Better than ZeroTrusted AI Firewall:
- Editor score 9.3 vs 8.5
A broad open-source toolkit for runtime LLM validation, policy enforcement, and risk detection.
- Secrets detection
- PII redaction
- Output guardrails
9.3/10★★★★★Visit Guardrails AI -
Best forSelf-hosted prompt and output scanning
- Better than ZeroTrusted AI Firewall:
- Editor score 9.2 vs 8.5
A self-hosted toolkit for scanning prompts, outputs, PII, secrets, and LLM risks.
- Secrets detection
- PII redaction
- Output guardrails
9.2/10★★★★★Visit LLM Guard -
Best forTeams wanting broad open-source guardrails
- Better than ZeroTrusted AI Firewall:
- Editor score 9.1 vs 8.5
A broad, self-hosted toolkit for controlling inputs, outputs, tools, and AI-agent behavior.
- PII redaction
- Output guardrails
- Prompt injection defense
9.1/10★★★★★Visit NVIDIA -
Best forAWS-centric teams needing managed guardrails
- Better than ZeroTrusted AI Firewall:
- Editor score 9.0 vs 8.5
A broad managed guardrail layer for teams building around Amazon Bedrock.
- Secrets detection
- PII redaction
- Output guardrails
9.0/10★★★★☆Visit AWS -
Best forAffordable teams needing LLM red teaming
- Better than ZeroTrusted AI Firewall:
- Free plan
- Editor score 8.9 vs 8.5
Affordable LLM red teaming with broad integrations and CI/CD testing.
8.9/10★★★★☆Visit PromptGuard -
Best forEnterprises securing agents and AI supply chains
- Better than ZeroTrusted AI Firewall:
- Editor score 8.8 vs 8.5
A broad enterprise platform for discovering, governing, testing, and protecting AI systems.
- Model-abuse detection
- Secrets detection
- PII redaction
8.8/10★★★★☆Visit Noma Security -
Best forOrganizations needing governed AI activity visibility
- Better than ZeroTrusted AI Firewall:
- Editor score 8.7 vs 8.5
A broad control layer for governing employee, application, agent, and MCP activity.
- Model-abuse detection
- Secrets detection
- PII redaction
8.7/10★★★★☆Visit WitnessAI -
Best forTeams protecting multimodal agents and MCP
- Better than ZeroTrusted AI Firewall:
- Editor score 8.6 vs 8.5
A runtime defense layer for teams securing multimodal agents and MCP connections.
- Model-abuse detection
- Secrets detection
- PII redaction
8.6/10★★★★☆Visit Straiker -
Best forMature enterprises needing AI gateway controls
A broad AI security platform for runtime inspection, guardrails and gateway enforcement.
- Secrets detection
- PII redaction
- Output guardrails
8.4/10★★★★☆Visit Prisma AIRS -
Best forSecurity teams needing broad AI threat monitoring
Broad AI threat monitoring with guardrails, telemetry, and enterprise deployment controls.
- Model-abuse detection
- Secrets detection
- PII redaction
8.3/10★★★★☆Visit GuardionAI -
Best forNewer teams needing AI discovery and red teaming
A broad AI security platform for discovery, runtime defense, governance, and red teaming.
- Model-abuse detection
- Secrets detection
- PII redaction
8.2/10★★★★☆Visit Lasso Security -
Best forTeams needing identity-aware agent guardrails
Identity-aware guardrails for securing prompts, outputs, tools, and agent actions.
- Secrets detection
- PII redaction
- Output guardrails
8.1/10★★★★☆Visit VotalAI -
Best forEnterprises needing agent and MCP controls
A broad runtime defense layer for enterprise LLM apps, agents, and MCP workflows.
- PII redaction
- Output guardrails
- Prompt injection defense
8.0/10★★★★☆Visit Check Point -
Best forTeams wanting free hybrid runtime policy controls
- Better than ZeroTrusted AI Firewall:
- Free plan
A hybrid runtime control layer for governing AI actions and recording decisions.
- PII redaction
- Output guardrails
- Prompt injection defense
7.9/10★★★★☆Visit GLACIS -
Best forTeams wanting free gateway-based guardrails
- Better than ZeroTrusted AI Firewall:
- Free plan
A free gateway and SDK layer for prompt, data, and output controls.
- PII redaction
- Output guardrails
- Prompt injection defense
7.8/10★★★★☆Visit Openlayer
ZeroTrusted AI Firewall Alternatives: Common Questions
What is the best alternative to ZeroTrusted AI Firewall?
Guardrails AI: #1 in our LLM Security Tools ranking, with an editor score of 9.3 out of 10. A broad open-source toolkit for runtime LLM validation, policy enforcement, and risk detection.
Is there a free alternative to ZeroTrusted AI Firewall?
Yes. Guardrails AI, LLM Guard, NVIDIA NeMo Guardrails, PromptGuard and GLACIS have a free plan or a free tier (6 of the 15 alternatives on this page).
Why do people look for ZeroTrusted AI Firewall alternatives?
Custom enterprise pricing can make budgeting less direct; No free plan is available; The published offering centers on one Enterprise plan.
How do I switch from ZeroTrusted AI Firewall?
Export your data from ZeroTrusted AI Firewall (most tools have an export in their settings). Sign up for the alternative; start on its free plan or trial if it has one. Import your export and set up the integrations your team relies on. Run both side by side for a short while, then cancel ZeroTrusted AI Firewall.
How to Switch from ZeroTrusted AI Firewall
- Export your data from ZeroTrusted AI Firewall (most tools have an export in their settings).
- Sign up for the alternative; start on its free plan or trial if it has one.
- Import your export and set up the integrations your team relies on.
- Run both side by side for a short while, then cancel ZeroTrusted AI Firewall.
ZeroTrusted AI Firewall vs Each Alternative
| # | Tool | Paid from | Prompt injection defense | PII redaction | Secrets detection | Output guardrails | Score |
|---|---|---|---|---|---|---|---|
| 9 | ZeroTrusted AI Firewall | Yes | Yes | Yes | Yes | 8.5 | |
| 1 | Guardrails AI | Free | Yes | Yes | Yes | Yes | 9.3 |
| 2 | LLM Guard | Free | Yes | Yes | Yes | Yes | 9.2 |
| 3 | NVIDIA NeMo Guardrails | Free | Yes | Yes | Yes | 9.1 | |
| 4 | Amazon Bedrock Guardrails | $0.00075/unit usage-based | Yes | Yes | Yes | Yes | 9.0 |
| 5 | PromptGuard | $19/seat/mo | 8.9 | ||||
| 6 | Noma Security | Yes | Yes | Yes | Yes | 8.8 | |
| 7 | WitnessAI | Yes | Yes | Yes | Yes | 8.7 | |
| 8 | Straiker Defend AI | Yes | Yes | Yes | Yes | 8.6 | |
| 9 | Prisma AIRS | Yes | Yes | Yes | Yes | 8.4 | |
| 10 | GuardionAI | Yes | Yes | Yes | Yes | 8.3 | |
| 11 | Lasso AI Security Platform | Yes | Yes | Yes | Yes | 8.2 | |
| 12 | VotalAI | Yes | Yes | Yes | Yes | 8.1 | |
| 13 | Check Point AI Guardrails | Yes | Yes | Yes | 8.0 | ||
| 14 | GLACIS | Yes | Yes | Yes | 7.9 | ||
| 15 | Openlayer Guardrails | Yes | Yes | Yes | 7.8 |
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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