Langfuse vs Arize Phoenix
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Langfuse
Open-source LLM observability, tracing and evals
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Arize Phoenix
Free, self-hosted LLM tracing and evaluation
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| RECATOOLS Score | 8.4 / 10 | 7.8 / 10 |
| Capability | ||
| Value for money | ||
| Ease of use | ||
| ASEAN readiness | ||
| API quality | ||
| Pricing | Freemium | Free |
| Free tier | Self-host free under MIT (enterprise modules need a key); cloud Hobby plan free with 50k units/month, 30 days data access, 2 users | 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 |
| Paid from | $29/month (Langfuse Cloud Core) | Phoenix is free. Arize's managed AX Pro plan is $50/month |
| Has API | ✓ | ✓ |
| Open source | ✓ | ✓ |
| Free to use | ✓ | ✓ |
| Users | — | — |
| Founded | 2023 | 2023 |
| Maker | ClickHouse, Inc. | Arize AI |
| Verdict | Langfuse covers the core of LLM observability: nested traces with cost and latency, prompt versioning, datasets, experiments and LLM-as-judge evaluators, through framework-agnostic SDKs and OpenTelemetry. The MIT core se... |
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... |
| 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.