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Braintrust vs TruLens: catalog facts
Braintrust	TruLens
Freemium Self-serve sign-up with paid plans listed on the pricing page.	Free Free and open source.
Web	Windows, macOS, Linux
Real-time tracing of prompts, responses and tool calls Evals scored by LLMs, code or humans	OpenTelemetry-native tracing of every agent step Judges explain their scores, not just give numbers
Hosted service that requires an account Aimed at teams building LLM products, not individual users	Aimed at developers comfortable writing code LLM judges add their own model calls and cost
Hosted service	Downloadable app
Closed source	Open source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.