What is Velvet?

Velvet, now part of Arize, supplies a developer gateway that lets teams analyze, evaluate, and monitor AI‑powered features. It connects directly to Arize’s Unified Observability and Evaluation Platform, offering real‑time assessment and continuous improvement of AI applications and agents.

Velvet supports open‑source LLM tracing and evaluation through Phoenix, enabling rapid experimentation and optimization. Its LiteLLM LLM Gateway delivers model access, fallback mechanisms, and spend tracking across more than 100 LLMs while using the OpenAI API format.

Velvet pricing Freemium

Individual $39/mo

Startup $195/mo

Growth custom

Verify on the official pricing page.

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Velvet's key features

Developer gateway for AI analysis
Unified observability and evaluation platform
Open-source LLM tracing module
Real-time evaluation and optimization
LLM gateway for model access
Spend tracking across LLMs
OpenAI format compatibility

Velvet use cases

Enable real-time monitoring of your deployed LLMs with Velvet's open-source tracing, instantly detect performance drops and trigger fallback models to maintain user experience.
Track and optimize AI feature spend across multiple models using Velvet’s LiteLLM gateway and automated cost dashboards, ensuring budget adherence in both cloud and on-premise environments.
Accelerate model development cycles by integrating Velvet’s unified observability with Arize, allowing developers to evaluate and compare feature importance in real time, and quickly iterate on high-impact changes.