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Guardrails review

Adding guardrails to large language models.

Updated Nov 1, 2026. Review written Nov 1, 2026 from the project's own sources; usage data refreshed every Monday.

Guardrails at a glance

Category
Evals and observability
Website
www.guardrailsai.com/docs

Is Guardrails growing? Usage data

In the week of Oct 25–31, 2026, Guardrails ranked #265 on the Devtoolwatch Board and #14 in Evals and observability, with a momentum score of 36 out of 100. Its main package had 33.3k downloads that week, +32% against its own 4-week average.

New GitHub stars per week for Guardrails12 weeks from Aug 9, 2026: 30, 28, 22, 28, 43, 31, 20, 34, 26, 29, 28, 14 new stars, an average of 28 a week.Aug 9week of Oct 25
New GitHub stars per week for the last 12 weeks, from GitHub's stargazer history (today's stargazers by the week they starred).
Show the weekly numbers
New GitHub stars per week for Guardrails
Week ofNew stars
Aug 9, 202630
Aug 16, 202628
Aug 23, 202622
Aug 30, 202628
Sep 6, 202643
Sep 13, 202631
Sep 20, 202620
Sep 27, 202634
Oct 4, 202626
Oct 11, 202629
Oct 18, 202628
Oct 25, 202614

The Board ranks tools by four signals each week: new stars, new stars for the repo's size, added downloads and download growth beyond the market. How the ranking works.

Guardrails alternatives

Other LLM evals and observability tools on the Board in the week of Oct 25–31, 2026, by momentum:

Evals and observability ranked by momentum, the week of Oct 25–31, 2026
RankToolStarsDownloads/wk
#1SkillSpectorSkillSpector is NVIDIA's security scanner that checks AI agent skills for vulnerabilities, malicious patterns, and supply-chain risks…23.7k–
#2JudgevalJudgeval is an open-source Python SDK for tracing and evaluating LLM-powered agents with prompt-based judges and online monitoring.1.1k80.2k
#3A.I.G (AI-Infra-Guard)A full-stack AI Red Teaming platform securing AI ecosystems via Agent Scan, Skills Scan, MCP scan, AI Infra scan and LLM jailbreak…7.2k–
#4LangfuseLangfuse is an open source LLM engineering platform for tracing, evaluating, prompt management, and debugging LLM applications and agents.36.8k9.8M
#5OpikOpik is an open-source platform from Comet for tracing, evaluating, and monitoring LLM applications, RAG systems, and AI agents.23.1k709.1k
#6promptfoopromptfoo is a CLI and library for evaluating and red-teaming LLM-based apps, including prompts, agents, and RAG pipelines.26.7k1.2M

All LLM evals and observability tools, ranked

Guardrails FAQ

How popular is Guardrails?

Guardrails has 7.6k GitHub stars as of Nov 1, 2026. It gained 14 new stars in the week of Oct 25–31, 2026, against a 12-week average of 28 a week. Its main package had 33.3k downloads that week, +32% against its own 4-week average. That made it #14 among LLM evals and observability tools on the Devtoolwatch Board.

What are the best alternatives to Guardrails?

Other LLM evals and observability tools on the Devtoolwatch Board in the week of Oct 25–31, 2026, by momentum: SkillSpector (#1), Judgeval (#2), A.I.G (AI-Infra-Guard) (#3), Langfuse (#4), Opik (#5). The alternatives table above has their numbers.

Sources

  1. Devtoolwatch Board, the week of Oct 25–31, 2026

Guardrails README badge

Maintainers can show the tool's weekly Board rank in their README:

Devtoolwatch badge for Guardrails

[![Devtoolwatch](https://index.devtoolwatch.com/badge/guardrails.svg)](https://index.devtoolwatch.com/tools/guardrails/)

How this page is made: Devtoolwatch writes each review from the project's README, releases, package metadata and website, with an AI model, then checks every claim against the source it cites and drops what the sources don't support. The numbers come from Devtoolwatch's daily GitHub snapshots, GitHub's stargazer history, and the npm and PyPI download APIs. Spotted an error? Email [email protected].