Ragas vs DeepEval vs Promptfoo vs Arize Phoenix

A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.

Ragas Widely adopted open-source framework for evaluating RAG pipelines with... Visit DeepEval Pytest-style unit testing for LLM outputs, 50+ metrics, Apache 2.0 Visit Promptfoo MIT-licensed LLM eval and red-teaming CLI, now owned by OpenAI Visit Arize Phoenix Open-source LLM evaluation and observability Visit
RECATOOLS Score 7.5 / 10 8 / 10 8.1 / 10 7.8 / 10
Capability — 8 8 8
Value for money — 9 8.5 9
Ease of use — 8 7.5 6
ASEAN readiness — 6.5 6.5 8
API quality — 7.5 8 8
Pricing Freemium Open Source Freemium Open Source
Free tier Open-source library (Apache-2.0) is free; you pay only for evaluator model calls. — — Free and open source — self-host at no cost
Paid from Paid hosted platform (app.ragas.io) for dashboards and team features. — — —
Has API ✓ ✓ ✓ ✓
Open source ✓ ✓ ✓ ✓
Free to use ✓ ✓ ✓ ✓
Users 15K+ GitHub stars — — —
Founded 2023 — — 2023
Maker Exploding Gradients — OpenAI (acquired March 2026) —
Verdict

What this is for: Measuring the quality of RAG pipelines with faithfulness, relevancy, and context metrics, plus synthetic test-set generation. Who this is for: Developers and ML teams who need to quantify and regressio...

DeepEval's whole pitch is that evaluating an LLM shouldn't require learning a new tool — if your team already writes pytest, you already know how to write a DeepEval test. That framing, plus Apache 2.0 licensing with no...

Promptfoo built its reputation as the eval tool developers actually reach for instead of rolling their own harness — YAML configs, 50-plus provider support, and a red-teaming mode that generates jailbreak and prompt-inje...

Arize Phoenix is an open-source observability and evaluation toolkit for LLM and AI applications, offering tracing, prompt and RAG debugging, evals, and OpenTelemetry-based instrumentation that runs locally or self-hoste...
Full review → Full review → Full review → Full review →
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Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.