Arize Phoenix vs LangWatch
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Arize Phoenix
Free, self-hosted LLM tracing and evaluation
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LangWatch
OpenTelemetry-native LLMOps for tracing, evals and agent simulation
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| RECATOOLS Score | 7.8 / 10 | 7.5 / 10 |
| Capability | ||
| Value for money | ||
| Ease of use | ||
| ASEAN readiness | ||
| API quality | ||
| Pricing | Free | Freemium |
| Free tier | Self-host Phoenix free: no licence fees, usage limits or feature gates. Arize AX Free cloud tier: 25k spans, 1 GB ingest a month, 15-day retention | Developer: free forever, 50k events/mo, 14-day data, 2 users, 3 scenarios/simulations/custom evals. Self-hosting free under Apache 2.0 |
| Paid from | Phoenix is free. Arize's managed AX Pro plan is $50/month | Growth €29 (US$34) per core seat/mo + €5 per 100k events beyond 200k |
| Has API | ✓ | ✓ |
| Open source | ✓ | ✓ |
| Free to use | ✓ | ✓ |
| Users | — | — |
| Founded | 2023 | — |
| Maker | Arize AI | Independent (LangWatch Reasoning Engine B.V.) |
| Verdict | Arize Phoenix is one of the most complete no-cost options for finding out why an agent or RAG pipeline behaved as it did: OpenTelemetry tracing, evals, datasets, experiments and a prompt playground, self-hosted with no f... |
LangWatch has become a genuinely open-source LLMOps platform, with strong agent simulation, evaluation and gateway features and generous self-hosting terms. Its pricing advantage over rivals is argued in its own blog rat... |
| 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.