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Arize Phoenix vs Helicone

Arize PhoenixHelicone

Bottom line: Arize Phoenix for engineers debugging LLM and agent apps; Helicone for teams wanting simple, cheap LLM logging.

Arize PhoenixArize Phoenix

Open-source LLM and agent observability built on OpenTelemetry.

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HeliconeHelicone

Open-source LLM observability and AI gateway in one line of code.

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Votes00
PricingFreemiumFreemium
CategoryCodingCoding
Tags
observabilityllm-evaluationopen-sourcetracingmonitoring
llm-observabilityai-gatewayopen-sourcemonitoringcaching
Best for
  • Engineers debugging LLM and agent apps
  • Teams wanting free, self-hosted observability
  • Eval-driven development workflows
  • Teams wanting simple, cheap LLM logging
  • Developers self-hosting an open-source gateway
  • Cost and usage monitoring across providers
Pros
  • Free and source-available, self-hosts in one command
  • Built on open OpenTelemetry standards
  • Strong tracing and evaluation for agents and RAG
  • Works locally, good for private/dev-time debugging
  • Backed by Arize's observability expertise
  • Extremely easy integration via a one-line base-URL swap
  • Open source under Apache 2.0 and free to self-host
  • Tiny Docker image that runs almost anywhere
  • Gateway features like caching, failover, and rate limiting cut cost and improve reliability
  • Generous free tier of 10,000 requests per month
Cons
  • Production-scale features require paid Arize AX
  • Self-hosting means you run the infrastructure
  • Dynatrace acquisition may change roadmap/governance
  • Observability setup still requires instrumentation effort
  • Evaluation quality depends on judge models and config
  • Product is in maintenance mode after the Mintlify acquisition, with no roadmap
  • Long-term hosted-service viability is uncertain and migration may be needed
  • Usage-based overages mean the Pro price is a floor, not a cap
  • Short retention on lower tiers (7 days free, 30 days Pro)
  • Large price jump from Pro to Team for compliance features

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