Open source guardrails projects
Every project in the registry tagged guardrails, ranked by real GitHub adoption.
Ultra-fast AI gateway with enterprise-grade reliability
Open-source, end-to-end platform for evaluating, observing, and improving LLM and AI agent applications. Tracing · Evals · Simulations · Datasets · Gateway · Gu
Unified API for all LLM providers with analytics
Akto is the fastest growing AI Security platform for your teams to secure AI agents, MCPs, LLMs, Agent skills, Gen AI apps in your organization.
TypeScript framework for building autonomous AI agents
🕷️ The fastest open-source AI Gateway and LLM Gateway — one binary with built-in console to route, secure, budget and observe every LLM call across OpenAI, Ant
SDLC evidence store and policy engine for your Software Supply Chain attestations, SBOMs, VEX, SARIF, QA reports, and more
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Frequently asked questions
How many open source guardrails projects are there?
This registry tracks 7 projects tagged guardrails, with 16,719 GitHub stars between them. The most-adopted is Bifrost at 9,295 stars.
Are these guardrails projects free to use?
Yes — 6 of the 7 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which guardrails project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these guardrails projects still maintained?
7 of the 7 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.