---
title: "aigis vs fast-llm-security-guardrails"
type: "comparison"
canonical_url: "https://www.graphcanon.com/compare/killertcell428-aigis-vs-zenguard-ai-fast-llm-security-guardrails"
tools: ["killertcell428-aigis", "zenguard-ai-fast-llm-security-guardrails"]
---

# aigis vs fast-llm-security-guardrails

*GraphCanon updated Sep 20, 2026*

## Verdict

Pick aigis if aigis is a deterministic zero-dependency Python firewall for AI agents offering protection against threats like memory poisoning and prompt injection with no external dependencies or complex configurations; pick fast-llm-security-guardrails if fast-llm-security-guardrails, also known as ZenGuard, is designed for the rapid deployment of security measures into AI agent systems to ensure they operate within defined trust constraints.

[aigis](https://pypi.org/project/pyaigis/) reports 54 GitHub stars, 8 forks, and 13 open issues, last pushed Sep 8, 2026. [fast-llm-security-guardrails](https://zenguard.ai/) has 155 stars, 21 forks, and 0 open issues, last pushed Feb 3, 2026. Figures are from public GitHub metadata via [aigis's repository](https://github.com/killertcell428/aigis) and [fast-llm-security-guardrails's repository](https://github.com/ZenGuard-AI/fast-llm-security-guardrails).

| | [aigis](/tools/killertcell428-aigis.md) | [fast-llm-security-guardrails](/tools/zenguard-ai-fast-llm-security-guardrails.md) |
| --- | --- | --- |
| Tagline | Deterministic zero-dependency Python firewall for AI agents | The fastest Trust Layer for AI Agents |
| Stars | 54 | 155 |
| Forks | 8 | 21 |
| Open issues | 13 | 0 |
| Language | Python | Python |
| Adopt for | aigis is a deterministic zero-dependency Python firewall for AI agents offering protection against threats like memory poisoning and prompt injection with no external dependencies or complex configurations. | fast-llm-security-guardrails, also known as ZenGuard, is designed for the rapid deployment of security measures into AI agent systems to ensure they operate within defined trust constraints. |
| Persona | - | - |
| Runtime | - | - |
| License | Apache-2.0 | MIT |
| Categories | AI Agents, Evaluation & Observability | AI Agents, Evaluation & Observability |

## Trust and health

_Sourced signals - not a safety guarantee. No winner column._

| | [aigis](/tools/killertcell428-aigis.md) | [fast-llm-security-guardrails](/tools/zenguard-ai-fast-llm-security-guardrails.md) |
| --- | --- | --- |
| Maintenance | Very active (96%) | Slowing (36%) |
| Days since push | 4d | 222d |
| Open issues (now) | 13 | 0 |
| Open issues delta | +2 (30d) | 0 (30d) |
| Owner type | User | Organization |
| Full report | [trust report](/tools/killertcell428-aigis/trust.md) | [trust report](/tools/zenguard-ai-fast-llm-security-guardrails/trust.md) |

## Shared compatibility

- **Python**: [aigis](/tools/killertcell428-aigis.md) - Python runtime; [fast-llm-security-guardrails](/tools/zenguard-ai-fast-llm-security-guardrails.md) - Python runtime

## Decision facts: aigis

- **Adopt for:** aigis is a deterministic zero-dependency Python firewall for AI agents offering protection against threats like memory poisoning and prompt injection with no external dependencies or complex configurations.

## Decision facts: fast-llm-security-guardrails

- **Adopt for:** fast-llm-security-guardrails, also known as ZenGuard, is designed for the rapid deployment of security measures into AI agent systems to ensure they operate within defined trust constraints.

## Choose when

### Choose aigis if…

- License: aigis is Apache-2.0, fast-llm-security-guardrails is MIT.
- Tags unique to aigis: ai-security, compliance, cybersecurity, firewall.
- aigis ships Docker support for self-hosted deployment.
- When your AI application requires robust security measures with minimal setup complexity

### Choose fast-llm-security-guardrails if…

- License: fast-llm-security-guardrails is MIT, aigis is Apache-2.0.
- Tags unique to fast-llm-security-guardrails: agentic-ai, ai-agents, ai-runtime, cx-agent.
- Fast integration of privacy and security guardrails in environments where real-time evaluation and observability are critical.

## When NOT to use aigis

- If your project strictly avoids adding third-party libraries
- When a full-fledged security solution with comprehensive features is necessary over minimal dependency footprint

## When NOT to use fast-llm-security-guardrails

- If your project requires a more customizable solution than what fast-llm-security-guardrails offers in its out-of-the-box configurations.
- For teams that operate without established runtime environments like LangChain or LlamaIndex, as this may necessitate significant adaptation of ZenGuard.

## Common questions

### What is the difference between aigis and fast-llm-security-guardrails?

aigis: Deterministic zero-dependency Python firewall for AI agents. fast-llm-security-guardrails: The fastest Trust Layer for AI Agents. See the comparison table for live GitHub stats and shared categories.

### When should I choose aigis over fast-llm-security-guardrails?

Choose aigis over fast-llm-security-guardrails when License: aigis is Apache-2.0, fast-llm-security-guardrails is MIT; Tags unique to aigis: ai-security, compliance, cybersecurity, firewall; aigis ships Docker support for self-hosted deployment; When your AI application requires robust security measures with minimal setup complexity.

### When should I choose fast-llm-security-guardrails over aigis?

Choose fast-llm-security-guardrails over aigis when License: fast-llm-security-guardrails is MIT, aigis is Apache-2.0; Tags unique to fast-llm-security-guardrails: agentic-ai, ai-agents, ai-runtime, cx-agent; Fast integration of privacy and security guardrails in environments where real-time evaluation and observability are critical.

### When should I avoid aigis?

If your project strictly avoids adding third-party libraries When a full-fledged security solution with comprehensive features is necessary over minimal dependency footprint

### When should I avoid fast-llm-security-guardrails?

If your project requires a more customizable solution than what fast-llm-security-guardrails offers in its out-of-the-box configurations. For teams that operate without established runtime environments like LangChain or LlamaIndex, as this may necessitate significant adaptation of ZenGuard.

### Is aigis or fast-llm-security-guardrails more popular on GitHub?

fast-llm-security-guardrails has more GitHub stars (155 vs 54). Stars measure visibility, not whether either tool fits your constraints.

### Are aigis and fast-llm-security-guardrails open source?

Yes - both are open-source projects on GitHub (aigis: Apache-2.0, fast-llm-security-guardrails: MIT).

### Where can I find alternatives to aigis or fast-llm-security-guardrails?

GraphCanon lists graph-backed alternatives at [aigis alternatives](/tools/killertcell428-aigis/alternatives) and [fast-llm-security-guardrails alternatives](/tools/zenguard-ai-fast-llm-security-guardrails/alternatives) ([aigis markdown twin](/tools/killertcell428-aigis/alternatives.md), [fast-llm-security-guardrails markdown twin](/tools/zenguard-ai-fast-llm-security-guardrails/alternatives.md)), ranked by typed relationship edges rather than popularity votes.

### Is there a machine-readable version of this comparison?

Yes. The markdown twin at [this comparison](/compare/killertcell428-aigis-vs-zenguard-ai-fast-llm-security-guardrails.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers.

### Which is better maintained, aigis or fast-llm-security-guardrails?

aigis: Very active. fast-llm-security-guardrails: Slowing. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance.

### Where are the full trust reports for aigis and fast-llm-security-guardrails?

GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [aigis trust report](/tools/killertcell428-aigis/trust); [fast-llm-security-guardrails trust report](/tools/zenguard-ai-fast-llm-security-guardrails/trust).

---

**Machine-readable endpoints**

- JSON: [`/api/graphcanon/graph?tool=killertcell428-aigis`](/api/graphcanon/graph?tool=killertcell428-aigis)
- LLM index: [/llms.txt](/llms.txt)
- Full corpus: [/llms-full.txt](/llms-full.txt)

_GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_