Which is more popular, langwatch or phoenix?

phoenix has more GitHub stars (11,689 vs 4,908).

Which is more actively developed, langwatch or phoenix?

langwatch had more commits in the last 90 days (1,587 vs 1,198).

Compare their capabilities, limitations and "best for" notes above. Trying each on a small task is the fastest way to decide.

Side-by-side comparison of two AI agent tools

phoenix is growing faster: +415 GitHub stars in the last 30 days vs +275 for langwatch.
Pick langwatch for: the platform for LLM evaluations and AI agent testing. Pick phoenix for: aI Observability & Evaluation.

From GitHub data refreshed daily.

The platform for LLM evaluations and AI agent testing

AI Observability & Evaluation

+End-to-end agent simulation capabilities that test against full stack including tools, state, and user interactions with detailed failure analysis
+Open standards approach with OpenTelemetry/OTLP support ensuring no vendor lock-in and framework-agnostic compatibility
+Integrated workflow combining tracing, evaluation, prompt optimization, and monitoring in a single platform eliminating tool sprawl

-As a specialized platform, may require learning curve and setup time for teams new to LLM evaluation workflows
-Self-hosting option available but may require infrastructure management for teams preferring on-premises deployment

•Regression testing of AI agents before production deployment using realistic scenario simulations to identify breaking points
•Production monitoring and observability of LLM-powered applications with detailed tracing and performance evaluation
•Collaborative prompt engineering and optimization with domain expert annotations and version control integration

Which is more popular, langwatch or phoenix?: phoenix has more GitHub stars (11,689 vs 4,908).
Which is more actively developed, langwatch or phoenix?: langwatch had more commits in the last 90 days (1,587 vs 1,198).
Should I use langwatch or phoenix?: Compare their capabilities, limitations and "best for" notes above. Trying each on a small task is the fastest way to decide.