Guardrails AI
Open-source framework for validating LLM inputs and outputs with configurable guardrails.
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About Guardrails AI
Guardrails AI is listed in our security & governance category and is aimed at builders. Open-source framework for validating LLM inputs and outputs with configurable guardrails. Pricing, as the maker states it: Open source + cloud. Maturity: Mature. We last checked the official link on 2026-10-16.
What is Guardrails AI?
Guardrails AI is an open-source framework for validating LLM inputs and outputs with configurable guardrails.
As of July 2026, validators are moving to standard PyPI packages, and Guardrails is discontinuing hosted remote inferencing (planned cutoff August 25, 2026).
Sources: the official README and our directory listing, checked 2026-10-18. Official site: guardrailsai.com.
Who is Guardrails AI for?
Developers who need to validate and constrain LLM output.
Guardrails AI at a glance
- Open source: Yes (Apache License 2.0)
- GitHub: guardrails-ai/guardrails · 7,547 stars (as of Oct 21, 2026)
Key features
- Input and output validation
- Configurable validators
- Validators as PyPI packages
Guardrails AI FAQ
What is Guardrails AI?
Guardrails AI is an open-source framework for validating LLM inputs and outputs with configurable guardrails.
Who is Guardrails AI for?
Developers who need to validate and constrain LLM output.
Is Guardrails AI free?
Guardrails AI's pricing, as the maker states it: Open source + cloud. Open-source tools are free to use, though you may still pay for model API usage or a hosted plan. Check the official site for current plans.
Is Guardrails AI open source?
Yes. Guardrails AI is released under the Apache License 2.0, according to its GitHub repository.
What are alternatives to Guardrails AI?
Similar tools include Tracecat, PentestAgent, Cisco MCP Scanner, Phase, Is My Agent Safe and Eleven.
Guardrails AI ratings and reviews
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