Arize Phoenix vs Galileo

Pick two tools from the same category to compare side-by-side.

	Arize Phoenix Open-source LLM tracing and evaluation platform from Arize AI, built on OpenTelemetry.	Galileo LLM and agent evaluation and observability platform for testing, monitoring, and guardrailing GenAI apps.
Category	observability	observability
Vendor type	hybrid	commercial
Pricing	freemium	freemium
Strengths	+ OpenTelemetry-based instrumentation works across frameworks and providers + Built-in evals, datasets, and experiments alongside tracing + Self-hostable via pip, Docker, or Helm in addition to hosted cloud + Prompt playground for replaying and comparing traced LLM calls	+ Combines evaluation, observability, and real-time guardrails in one platform + Free tier with unlimited users and custom evaluations + Flexible deployment including hosted, VPC, and on-premises + Built for high-volume production agent monitoring
Tradeoffs	− Elastic License 2.0 (ELv2) restricts offering Phoenix itself as a managed service − Self-hosting means operating and scaling the collector and storage yourself − Advanced enterprise monitoring features live in the separate commercial Arize platform	− Closed-source and commercial, no self-hosted open-source option − Free plan limited to 5k traces per month − Advanced deployment and support gated behind Enterprise pricing
Used in stacks	0	0