Best GLACIS Alternatives in 2026
The top GLACIS alternatives are Guardrails AI, LLM Guard and NVIDIA NeMo Guardrails: 15 LLM security tools our editors would look at instead of GLACIS, in our ranking order.
GLACIS: A hybrid runtime control layer for governing AI actions and recording decisions. Where it falls short: integrations cover only OpenAI, anthropic, and google gemini.
Switching from GLACIS? For most llm security tools buyers the best GLACIS 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 GLACIS Alternative
- Integrations cover only OpenAI, Anthropic, and Google Gemini
- The runtime enforcement engine and Notary are not open source
- Advanced production capabilities are split across multiple plan listings
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
Visit Guardrails AI
All 15 GLACIS 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 GLACIS:
- Editor score 9.3 vs 7.9
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 GLACIS:
- Editor score 9.2 vs 7.9
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 GLACIS:
- Editor score 9.1 vs 7.9
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 GLACIS:
- Editor score 9.0 vs 7.9
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 GLACIS:
- Editor score 8.9 vs 7.9
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 GLACIS:
- Editor score 8.8 vs 7.9
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 GLACIS:
- Editor score 8.7 vs 7.9
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 GLACIS:
- Editor score 8.6 vs 7.9
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 forSecurity teams needing broad inline AI protection
- Better than GLACIS:
- Editor score 8.5 vs 7.9
Broad inline protection for organizations running LLMs, agents, and AI APIs.
- Model-abuse detection
- Secrets detection
- PII redaction
8.5/10★★★★☆Visit ZeroTrusted.ai -
Best forMature enterprises needing AI gateway controls
- Better than GLACIS:
- Editor score 8.4 vs 7.9
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
- Better than GLACIS:
- Editor score 8.3 vs 7.9
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
- Better than GLACIS:
- Editor score 8.2 vs 7.9
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
- Better than GLACIS:
- Editor score 8.1 vs 7.9
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
- Better than GLACIS:
- Editor score 8.0 vs 7.9
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 gateway-based guardrails
A free gateway and SDK layer for prompt, data, and output controls.
- PII redaction
- Output guardrails
- Prompt injection defense
7.8/10★★★★☆Visit Openlayer
GLACIS Alternatives: Common Questions
What is the best alternative to GLACIS?
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 GLACIS?
Yes. Guardrails AI, LLM Guard, NVIDIA NeMo Guardrails, PromptGuard and Openlayer Guardrails have a free plan or a free tier.
Why do people look for GLACIS alternatives?
Integrations cover only OpenAI, Anthropic, and Google Gemini; The runtime enforcement engine and Notary are not open source; Advanced production capabilities are split across multiple plan listings.
How do I switch from GLACIS?
Export your data from GLACIS (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 GLACIS.
How to Switch from GLACIS
- Export your data from GLACIS (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 GLACIS.
GLACIS vs Each Alternative
| # | Tool | Paid from | Prompt injection defense | PII redaction | Secrets detection | Output guardrails | Score |
|---|---|---|---|---|---|---|---|
| 15 | GLACIS | Yes | Yes | Yes | 7.9 | ||
| 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 | ZeroTrusted AI Firewall | Yes | Yes | Yes | Yes | 8.5 | |
| 10 | Prisma AIRS | Yes | Yes | Yes | Yes | 8.4 | |
| 11 | GuardionAI | Yes | Yes | Yes | Yes | 8.3 | |
| 12 | Lasso AI Security Platform | Yes | Yes | Yes | Yes | 8.2 | |
| 13 | VotalAI | Yes | Yes | Yes | Yes | 8.1 | |
| 14 | Check Point AI Guardrails | Yes | Yes | Yes | 8.0 | ||
| 15 | Openlayer Guardrails | Yes | Yes | Yes | 7.8 |
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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