A agentindex
Comparison

Arize Phoenix vs Laminar

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

Arize Phoenix

Open-source LLM tracing and eval.

  • + Open source with OTel foundations
  • + Good LLM-as-a-judge evals built in
  • − Elastic license restricts some hosted offerings
  • − Enterprise features in the paid Arize cloud

Laminar

Open-source observability and eval for AI agents.

  • + Open source with a Rust core for performance
  • + Built-in eval and datasets
  • − Smaller community
  • − Newer project
Spec Arize Phoenix Laminar
Role Observability Observability
Tags observability, evaluation, persona-data-scientist, persona-platform-engineer observability, evaluation, persona-data-scientist, persona-platform-engineer
License Elastic-2.0 Apache-2.0
Open source Yes Yes
Self-hostable Yes Yes
MCP support No No
Pricing free freemium
Price Free tier Free tier
Usage cost No model cost No model cost
Models multi multi
Languages python, typescript typescript, rust
GitHub stars 10.4k 3.1k
Last activity 2026-07-04 2026-07-03