Arize Phoenix vs Braintrust
Arize Phoenix is listed under Observability, Braintrust under Observability. Shared focus: evals, tracing. Each name links to the product's own site.
| Category | Observability | Observability |
|---|---|---|
| Pricing | Free | Freemium |
| Public code | Yes | No |
| Tags | phoenix, arize, tracing, evals | braintrust, evals, tracing, prompts |
| Website | phoenix.arize.com | braintrust.dev |
What Arize Phoenix does
Phoenix is a free tool you can self-host for tracing and evaluating LLM apps and agents. It accepts OpenTelemetry data and runs in a notebook, in a container or on Arize's hosted service.
What Braintrust does
Braintrust combines evaluation, tracing and a prompt playground. Teams use it to score model outputs against datasets, compare changes and watch production traffic for regressions.
Other options
See all Observability, or alternatives to Arize Phoenix and Braintrust.