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OpenLIT is an open-source Agent Harness Engineering platform for LLM tracing, evaluations, prompt management, and cost tracking, built on OpenTelemetry and free to self-host under Apache 2.0.
See how OpenLIT compares with other AI engineering and LLM observability tools.
Why teams choose OpenLIT
- OpenTelemetry-native: vendor-neutral, portable telemetry data
- GPU monitoring for NVIDIA GPUs out of the box
- Self-hostable with Apache 2.0 license, free forever
- Vector DB monitoring alongside LLM tracing
- 60+ integrations across LLMs, frameworks, Vector DBs, and GPUs
- Prompt Hub, Vault, and Fleet Hub included
Detailed Comparisons
OpenLIT vs Langfuse
Compare OpenLIT and Langfuse for LLM observability. See how OpenTelemetry-native monitoring, GPU tracking, and self-hosted deployment stack up.
OpenLIT vs Helicone
Compare OpenLIT and Helicone for LLM observability. OpenLIT is SDK-based with no proxy latency, OpenTelemetry-native, and fully self-hostable.
OpenLIT vs LangSmith
Compare OpenLIT and LangSmith for LLM monitoring. OpenLIT is open-source, self-hostable, and framework-agnostic. LangSmith is a proprietary cloud platform optimised for LangChain.
OpenLIT vs Datadog LLM Observability
Compare OpenLIT and Datadog for LLM observability. OpenLIT is purpose-built, open-source, and free to self-host. Datadog is a general-purpose platform with LLM monitoring as a paid add-on.
OpenLIT vs Arize Phoenix
Compare OpenLIT and Arize Phoenix for LLM observability. OpenLIT is Apache 2.0 with a full self-hosted platform (traces, evals, Prompt Hub, GPU). Phoenix is Elastic License 2.0 with strong tracing and eval UX.
OpenLIT vs Comet Opik
Compare OpenLIT and Comet Opik for LLM observability. Both are Apache 2.0 and self-hostable. OpenLIT adds OTel-native GPU telemetry, Prompt Hub, Vault, and a full AI engineering platform around traces and evals.
OpenLIT vs Braintrust
Compare OpenLIT and Braintrust for LLM evaluation and prompt management. OpenLIT is Apache 2.0 and free to self-host with OTel-native tracing. Braintrust is a commercial, cloud-first platform strong on experiments and eval UX.
OpenLIT vs OpenLLMetry
Compare OpenLIT and OpenLLMetry. OpenLLMetry is an OpenTelemetry instrumentation library. OpenLIT is a full self-hosted AI engineering platform plus SDKs that also speak OTLP.
Get started
Ready to use the OpenLIT UI in production?
Self-host or connect your stack in minutes. Same harness UI for traces, dashboards, prompts, and evaluations.