TruLens by Snowflake
Open-source library that traces AI agents with OpenTelemetry and scores each step with LLM judges.
LLM observability and evals Open source
Price
Free (open source)
you pay only for the compute it runs on
Free tier
Open source
SDK downloads
—
PyPI trulens
Status
—
no public status page
Pricing
| Free tier | — |
|---|---|
| Cheapest paid plan | — |
| Usage price | — |
| Good to know | MIT licensed; originally built by TruEra, now maintained by Snowflake. No paid offering listed. |
Open source: free to run on your own hardware; you pay only for the compute. Checked
Use it from an agent
| MCP server | None found |
|---|---|
| PyPI | pip install trulens |
Alternatives to TruLens
| API | Free | Price | SDK downloads / wk | GitHub stars | MCP |
|---|---|---|---|---|---|
| Opik Platform for tracing, testing, and evaluating AI agents and LLM applications. |
25k spans/month, 60-day retention | Free plan · paid from $19/mo | — | — | |
| Pydantic Logfire Observability platform for AI agents, services, and infrastructure with tracing, logging, and metrics. |
10 million spans, logs, or metrics per month | Free plan · paid from $49/mo | — | — | |
| Arize AX Observability and evaluation platform for AI agents and LLM applications. |
10 issues/month, 25k trace spans/month, 1 GB... | Free plan · paid from $50/mo | — | — | |
| Arthur AI Monitor AI model performance and ship trustworthy agents with governance and observability. |
4 use cases, 7-day data retention, 5k jobs,... | Free plan · paid from $60/mo | — | — | |
| Braintrust Observability platform for AI applications with tracing, evaluation, and storage infrastructure. |
1 GB processed data/month, 10k scores/month,... | Free plan · paid from $249/mo | — | — | |
| Confident AI LLM evaluation and observability platform for testing and monitoring AI applications. |
Free Forever: 5 test runs/week, 1 GB-month... | Free plan · paid from $200/mo | — | — |