Ragas
The de-facto open-source metric library for RAG evaluation (faithfulness, context precision/recall), used standalone or inside other platforms.
| Category | Evals & Testing |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | free |
| Pricing notes | Apache-2.0 OSS; hosted app in development by Exploding Gradients |
| Framework integrations | langchain, llamaindex, openai-sdk, haystack |
| Funding / ownership | Y Combinator alum (Exploding Gradients) |
| GitHub stars | 14,355 |
| Maintenance | slow (2026-02-24) |
| License (GitHub) | Apache-2.0 |
| Open issues | 429 |
| Maturity signal | 79/100 (Established) — computed from public GitHub signals, see methodology |
Pricing/feature source: https://github.com/explodinggradients/ragas
Maturity signal is computed from public GitHub data only. How it is calculated.
Frequently asked questions
Is Ragas open source?
Yes. Licensed under Apache-2.0.
Can I self-host Ragas?
Yes — Ragas can run in your own infrastructure.
How much does Ragas cost?
Free. Apache-2.0 OSS; hosted app in development by Exploding Gradients