Helicone vs Phoenix by Arize
Detailed side-by-side comparison to help you choose the right tool
Helicone
🔴DeveloperLLM Observability
Open-source LLM observability and AI gateway — logs every prompt, response, cost, and latency across 20+ providers with a one-line proxy or async SDK, plus caching, retries, and prompt experiments.
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FreePhoenix by Arize
🔴DeveloperBusiness Analytics
Open-source AI observability and evaluation platform built on OpenTelemetry for tracing, debugging, and monitoring LLM applications and AI agents in production.
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FreeFeature Comparison
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Helicone - Pros & Cons
Pros
- ✓5-minute proxy integration captures full traces, cost, and latency across 20+ providers
- ✓Real AI gateway features (caching, retries, fallback, key vault) replace a custom proxy
- ✓MIT-licensed and self-hostable on Postgres + ClickHouse — passes regulated procurement
Cons
- ✗Proxy mode adds a network hop unless self-hosted in your own region
- ✗Prompt experiment UX is less mature than dedicated eval platforms like Braintrust
- ✗Self-hosting requires running ClickHouse, which is an extra ops surface
Phoenix by Arize - Pros & Cons
Pros
- ✓Built on OpenTelemetry OTLP and OpenInference, so instrumentation is standards-aligned and not tightly coupled to a proprietary trace format.
- ✓Combines tracing, evaluations, prompt iteration, datasets, and experiments in one workflow instead of only showing raw LLM logs.
- ✓Captures detailed agent and LLM execution steps, including model calls, retrieval, tool use, prompt templates, variables, outputs, and custom logic.
- ✓Strong integration coverage for common AI stacks including LlamaIndex, LangChain, DSPy, Mastra, Vercel AI SDK, OpenAI, Anthropic, Bedrock, Mistral, Vertex, Python, TypeScript, and Java.
- ✓Flexible deployment options: local development, Docker, Kubernetes with Helm, self-hosted cloud, and Phoenix Cloud instances.
- ✓Open-source and ELv2 licensed, with public development and an active community; Arize’s 2026 site reports millions of monthly downloads and thousands of GitHub stars.
Cons
- ✗Requires application instrumentation before it becomes useful; teams without engineering bandwidth may not get value from Phoenix immediately.
- ✗Self-hosted Phoenix leaves trace volume, ingestion volume, projects, retention, upgrades, and infrastructure operations to the user.
- ✗Evaluation quality depends on the team’s evaluator design, labels, datasets, and review process; Phoenix provides the workflow but does not automatically know what good output means for every product.
- ✗Some advanced managed capabilities, such as online evaluations, product observability monitors, custom metrics, longer retention, support, and enterprise controls, are positioned in Arize AX rather than the free Phoenix OSS tier.
- ✗The product has several related names and paths, including Phoenix OSS, Phoenix Cloud, and Arize AX, which can make pricing and deployment choices confusing for new teams.
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