2 Arize Phoenix Alternatives, Compared
Open-source AI observability for LLM apps sits in Agent Tracing. Below is every comparable tool we hold data on — 2 of them have a free tier.
Still want the original? Read our Arize Phoenix write-up.
| Tool | What it does | Pricing | Free tier |
|---|---|---|---|
| Open-source observability for your LLM application, based on OpenTelemetry  | Free tier | ||
| An open-source LLM engineering platform for tracing, evaluation, prompt management, and metrics. [#opensource](https://github.com/langfuse/langfuse) | Free tier |
Openllmetry — Open-source observability for your LLM application, based on OpenTelemetry 
Open-source observability for your LLM application, based on OpenTelemetry  Found in: kyrolabs/awesome-langchain
Langfuse — An open-source LLM engineering platform for tracing, evaluation, prompt management, and metrics. [#opensource](https://github.com/langfuse/langfuse)
An open-source LLM engineering platform for tracing, evaluation, prompt management, and metrics. [#opensource](https://github.com/langfuse/langfuse) Found in: steven2358/awesome-generative-ai
Common questions
What is the best Arize Phoenix alternative?
Openllmetry is the closest alternative to Arize Phoenix in the Agent Tracing category. Open-source observability for your LLM application, based on OpenTelemetry  Which one fits depends on whether you need a free tier — 2 of these 2 options have one.
Is there a free alternative to Arize Phoenix?
Yes — Openllmetry, Langfuse all offer a free tier.
How were these Arize Phoenix alternatives chosen?
They are tools listed in the same category as Arize Phoenix on Neura Market, ranked by how closely they match on capability. We list every option we hold data for rather than a paid-placement shortlist.