AI platform
Arize
Unified Observability and Evaluation Platform for AI. Arize helps you accelerate development of AI apps and agents, then perfect them in production.
Velvet is now part of Arize
Velvet made a developer gateway to analyze, evaluate, and monitor AI-powered features. Arize, the enterprise platform for AI evaluation and observability, acquired Velvet in 2025. Emma and Chris were the founders of Velvet, and joined forces with Arize to accelerate adoption of Arize's unified AI platform.
Open source
Phoenix
Open-source LLM tracing and evaluation to accelerate AI development. Seamlessly evaluate, experiment, and optimize AI applications in real time.
LLM gateway
LiteLLM
LLM Gateway to provide model access, fallbacks, and spend tracking across 100+ LLMs. All in the OpenAI format. Use as a platform, or deploy open source.