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Code & Dev Tools · verified 2026-07-11

Guardrails AI

Validators between the model and your app.

An open-source framework for checking LLM output against structure, safety and factuality rules, with automatic re-asking on failure.

OPEN GUARDRAILS AI

Rating: 4.0 / 5
Pricing: Open source
Best for: Safety, Developers, Evals
Platforms: API, Linux, macOS
Runs locally: Yes
Content policy: Standard filters

Matching filters

Writing code Building apps Research Automation Evals & observability Has a public API Open source Free or open source macOS Linux Desktop app API Runs locally Safety tuned

What stands out

Composable validators
Structured output enforcement
Apache licence

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