TruLens
Open-source library for feedback-function-based evaluation and tracing of RAG and agent apps, now stewarded by Snowflake.
| Category | Evals & Testing |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | free |
| Pricing notes | Free OSS (MIT); maintained under Snowflake after TruEra acquisition |
| Framework integrations | langchain, llamaindex, openai-sdk |
| Funding / ownership | TruEra acquired by Snowflake (2024) |
Pricing/feature source: https://github.com/truera/trulens