Arize Phoenix vs LangWatch
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Arize Phoenix
Open-source LLM evaluation and observability
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LangWatch
OpenTelemetry-native LLMOps platform for tracing, evals and agents
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| RECATOOLS Score | 7.8 / 10 | 7.5 / 10 |
| Capability | ||
| Value for money | ||
| Ease of use | ||
| ASEAN readiness | ||
| API quality | ||
| Pricing | Open Source | Freemium |
| Free tier | — | — |
| Paid from | — | — |
| Has API | ✓ | ✓ |
| Open source | ✓ | ✓ |
| Free to use | ✓ | ✓ |
| Users | — | — |
| Founded | 2023 | — |
| Maker | — | — |
| Verdict | 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... |
LangWatch's most interesting move isn't a feature, it's the pricing shift it made in February 2026: away from per-trace billing (the model Langfuse and LangSmith both use, which can spike hard as usage grows) toward seat... |
| 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.