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Arize Phoenix vs SigNoz
Quick verdict
Arize Phoenix and SigNoz are closely matched on licensing, self-hosting and OpenTelemetry support — the decision comes down to pricing and framework integrations below.
Side-by-side comparison from the Agent Observability Index: licensing, self-hosting, pricing model and integrations — no vendor copy, primary sources linked.
| Arize Phoenix | SigNoz | |
|---|---|---|
| One-liner | Open-source, OpenTelemetry-based tracing and evaluation library that runs locally or self-hosted, serving as the OSS on-ramp to Arize's enterprise platform. | Open-source OpenTelemetry APM that handles LLM observability via standard OTel instrumentation rather than an LLM-specific SDK. |
| Category | Observability & Tracing | Observability & Tracing |
| OpenTelemetry-native | Yes | Yes |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Pricing model | free | freemium |
| Pricing notes | Fully free OSS (Elastic License v2); hosted Phoenix Cloud has a free tier | OSS self-host free; cloud from $49/mo usage-based |
| Frameworks | openai-sdk, langchain, llamaindex, dspy, opentelemetry, smolagents | opentelemetry, openai-sdk, langchain |
| GitHub stars | 10.1k | 27.3k |
| Maturity (GitHub signal) | 90/100 (Mature) | 90/100 (Mature) |
| Funding / ownership | Backed by Arize AI ($70M Series C, Feb 2025) | YC W21; $6.5M seed |
How to choose
- Both link to primary pricing sources below — verify current tiers before committing; this market shifts monthly.
Sources: Arize Phoenix · SigNoz
Frequently asked questions
Is Arize Phoenix or SigNoz open source?
Arize Phoenix: Yes. SigNoz: Yes.
Can Arize Phoenix and SigNoz be self-hosted?
Arize Phoenix: Yes. SigNoz: Yes.
Arize Phoenix vs SigNoz: which should I choose?
Arize Phoenix and SigNoz are closely matched on licensing, self-hosting and OpenTelemetry support — the decision comes down to pricing and framework integrations below.