Phoenix by Arize
Open-source LLM and agent observability with tracing, evaluations, and experiment tracking.
Overview
Phoenix by Arize: OSS LLM + Agent Observability
Phoenix by Arize is Open-source LLM and agent observability platform. LLM observability is the gap most teams hit between prototype and production. Phoenix is the free, OSS option that does the job — tracing, evals, and experiment tracking without vendor lock-in.
Key Features
- Open-source LLM and agent observability platform
- OpenTelemetry-native distributed tracing
- Automated evaluations (hallucination, toxicity, relevance)
- Prompt iteration and dataset management
- 4K+ GitHub stars
Ideal Use Case
Engineering teams running LLM applications and agents in production who need to debug issues, track regressions, and prove their agents are behaving correctly over time.
Why Use Phoenix by Arize
LLM observability is the gap most teams hit between prototype and production. Phoenix is the free, OSS option that does the job — tracing, evals, and experiment tracking without vendor lock-in.
FAQ
Q: vs Langfuse / Helicone? A: All three are LLM observability platforms; Phoenix is differentiated by Arize's eval-science depth and OTel-native architecture.
Q: Free? A: Yes — fully OSS; Arize sells the enterprise platform.
tl;dr
Open-source LLM observability. OTel-native. From Arize AI. 4K+ stars.
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Looking for more options? Browse the Developer Tools directory or read our best AI coding tools listicle. Phoenix by Arize is also tracked on Crunchbase.
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