How Makers Build
Check my stackPlan my stack
Menu

Ragas

Open-source Python library for evaluating LLM and RAG applications, with metrics such as faithfulness and context precision and synthetic test-set generation.

Visit ragas.io ↗Pricing & calculatorAlternatives
Works with AI agents:llms.txt
Ask your AI about this, with this page as the source:ChatGPT ↗Claude ↗Perplexity ↗

Where it fits

LLM Observability & Evals · Eval and test CLIScoring RAG pipelines — how faithful answers are to the retrieved context and how relevant that context is — and generating test questions from your documents.Trade-off: A Python library, not a platform — no tracing of live traffic or UI, and LLM-judged metrics cost tokens per run.

How Ragas itself is built

2 tools, from its own code, website and Product Hunt page.

ResendVercel

Who uses it

No maker's live product on record yet, and 10 open-source projects that declare it in their code.

Declared in code 10How evidence is collected →

We haven't found a maker's live product that uses Ragas yet — only the open-source projects below, which declare it in their code.

Open source: a project that declares Ragas as a dependency in its public code — verifiable, but not necessarily a live product.

Reliability and open issues

Most wanted on GitHubOpen on 2026-10-04 in vibrantlabsai/ragas, with activity in the last year — issues and feature requests by 👍.

Alternatives to Ragas

All alternatives by situation →
LangSmithApps built on LangChain or LangGraph, where tracing works with almost no setup.Free tier11 makers · LLM observability & evalsCompare with Ragas →
LangfuseTracing, prompt management and evals in one tool you can run on your own server for free.Open sourceFree tier33 makers · LLM observability & evals
Arize PhoenixOpenTelemetry-based tracing and evals you can start locally in a notebook, then self-host or move to its cloud.Self-hostableFree tier
HeliconeGetting request logs, costs and latency by changing one base URL, with no SDK instrumentation.Open sourceFree tier13 makers · LLM observability & evals
BraintrustEval-driven work — scoring outputs and comparing prompts and models side by side in experiments.Free tier5 makers · LLM observability & evals
OpikTracing, evaluations and prompt optimization in an Apache-licensed platform you self-host with Docker or Kubernetes, or use on Comet's cloud.Open sourceFree tier
PromptfooRunning prompts and models against test cases from the command line or CI, including red-team tests for prompt injection and data leaks.Open sourceFree tier
DeepEvalWriting LLM evals as pytest-style tests in Python, with ready-made metrics for hallucination, faithfulness and answer relevancy.Open sourceFree tier

Questions makers ask about Ragas

Is Ragas free?

Yes — it is free, open-source software.

Is Ragas open source or self-hostable?

Open source, and you can self-host it. source ↗

Can AI coding agents work with Ragas?

It serves an llms.txt docs index.

Who uses Ragas?

No maker's live product we track yet; 10 open-source projects declare it in their code. source ↗