Agenta vs Arize Phoenix
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
AI tool · Open source
An open-source LLMOps platform combining a prompt playground, prompt versioning, evaluations and tracing.
AI tool · Open source
An open-source tool for tracing, evaluating and experimenting with LLM and agent applications, built on OpenTelemetry.
The short answer
Choose Agenta if you need…
- Teams wanting a self-hostable prompt platform
- Systematic prompt evaluation
Choose Arize Phoenix if you need…
- Local debugging of LLM traces
- OpenTelemetry-based stacks
Side-by-side
| Agenta | Arize Phoenix | |
|---|---|---|
| Type | Prompting · Prompt managers | Prompting · Evaluation & observability |
| Price | Open source | Open source |
| Platforms | Web, Self-hosted, API | Self-hosted, Web, API |
| Works with | LangChain, OpenAI | LangChain, LlamaIndex, OpenAI |
| Hands-on tested by us | Not yet | Not yet |
| Last checked | 2026-10-29 | 2026-10-29 |
What each one is
Agenta
An open-source LLMOps platform combining a prompt playground, prompt versioning, evaluations and tracing. Good all-in-one open option. Smaller community than the biggest players, so expect fewer integrations.
Arize Phoenix
An open-source tool for tracing, evaluating and experimenting with LLM and agent applications, built on OpenTelemetry. Standards-based and free to run locally. Enterprise features live in Arize's paid platform.
Best for
Agenta
- Teams wanting a self-hostable prompt platform
- Systematic prompt evaluation
Arize Phoenix
- Local debugging of LLM traces
- OpenTelemetry-based stacks
Strengths
Agenta
- Prompt playground and versioning
- Human and automatic evaluation
- Tracing
- Self-hosting
Arize Phoenix
- OpenTelemetry tracing
- LLM-as-judge evals
- Prompt playground
- Datasets and experiments
Frequently asked questions
What is the difference between Agenta and Arize Phoenix?
Agenta: An open-source LLMOps platform combining a prompt playground, prompt versioning, evaluations and tracing. Arize Phoenix: An open-source tool for tracing, evaluating and experimenting with LLM and agent applications, built on OpenTelemetry. Agenta suits teams wanting a self-hostable prompt platform, while Arize Phoenix suits local debugging of llm traces.
Are Agenta and Arize Phoenix free?
Agenta: Open source. Arize Phoenix: Open source.
What are other alternatives to Agenta and Arize Phoenix?
Other options people compare them with include PromptLayer, PromptHub, Langfuse, LangSmith, Opik.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.