Arize Phoenix vs Helicone

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.	Helicone LLM observability and cost tracking via proxy or async logging.
Category	observability	observability
Vendor type	hybrid	hybrid
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	+ Drop-in proxy integration + Cost dashboards readable by non-engineers + Open source with managed option
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	− Proxy adds a small latency hop (mitigated by async mode)
Used in stacks	0	13