LLM InfrastructureOpen Source✦ Free Tier
Arize Phoenix
ML/LLM observability and evaluation platform
⭐ 4,000 stars● Health 75 — ActiveApp Infrastructure
About
Open-source observability platform for ML and LLM applications. Supports tracing, evaluation, and dataset management with a strong eval framework.
Choose Arize Phoenix when…
- •You need ML observability beyond just LLMs
- •RAG pipeline tracing and eval integration is required
- •You're running experiments and need a notebook-friendly tool
Builder Slot
How do you see what's happening?Recommended for most stacks
Traces every LLM call, eval, and cost so you know exactly what your stack is doing
Dev Tools
Not applicable
App Infra
Recommended
Hybrid
Recommended
Other tools in this slot:
Stack Genome Detection
AIchitect's Genome scanner detects Arize Phoenix in your project via these signals:
pip packages
arize-phoenixopeninference-instrumentation-openaienv vars
PHOENIX_API_KEYAlternatives to consider (2)
Pricing
✦ Free tier available
EnterpriseCustom
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