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