Guardrails AI
Open-source output-validation framework where composable validators enforce schemas, policies and safety constraints on LLM I/O.
| Category | Guardrails & Safety |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | freemium |
| Pricing notes | Apache-2.0 framework free; Guardrails Hub community validators; managed offering for enterprises |
| Framework integrations | openai-sdk, anthropic, langchain, litellm |
| Funding / ownership | $7.5M seed (2024) |
| GitHub stars | 6,999 |
| Maintenance | active (commit 2026-06-13) |
| License (GitHub) | Apache-2.0 |
| Open issues | 40 |
| Maturity signal | 98/100 (Mature) — computed from public GitHub signals, see methodology |
Pricing/feature source: https://www.guardrailsai.com
Maturity signal is computed from public GitHub data only. How it is calculated.
Frequently asked questions
Is Guardrails AI open source?
Yes. Licensed under Apache-2.0.
Can I self-host Guardrails AI?
Yes — Guardrails AI can run in your own infrastructure.
How much does Guardrails AI cost?
Freemium. Apache-2.0 framework free; Guardrails Hub community validators; managed offering for enterprises