Braintrust vs Phoenix

Side-by-side comparison of Braintrust and Phoenix: pricing, features, API access, and community ratings.

AI comparison summary

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	Braintrust The AI observability platform for building quality AI products at scale Visit	Phoenix The open-source platform for AI agent development, tracing, and evaluation Visit
Category	AI observability	AI observability
Pricing	Freemium	Freemium
Starting price
Free tier
Audience	All audiences	Technical
API available
Open source
Self-hostable
Model provider		Vendor Agnostic
Founded
Headquarters	US	US
Key strengths	·Real-time trace inspection for prompts, responses, and tool calls ·Automated pattern discovery via Topics clustering ·Flexible eval scoring with LLMs, code, or human reviewers ·Custom-built Brainstore database optimized for AI trace data at scale	·Full OpenTelemetry-native tracing for LLM agents ·LLM-as-a-judge and human annotation for evaluation ·Vendor-agnostic — works with any model, framework, or language ·Self-hostable with zero data leaving your infrastructure