# OpenLIT

> OpenLIT is an open source Harness Engineering platform. Trace LLMs and agents with OpenTelemetry, run LLM evaluations, manage prompts, compare models, and self-host free under Apache 2.0.

OpenLIT is an open source Harness Engineering platform. This file helps agents find clean Markdown versions of key marketing pages. Product documentation has its own index at https://docs.openlit.io/llms.txt.

## Marketing site (Markdown)

- [Open source Harness Engineering Platform](https://openlit.io/index.md): Trace LLMs and AI agents with OpenTelemetry, run LLM evaluations, manage prompts, compare models, store API keys in Vault, and self-host free under Apache 2.0.
- [OpenLIT Pricing: Free Open Source Self-Host and Cloud](https://openlit.io/pricing.md): OpenLIT pricing is simple. Self-host the open source Harness Engineering platform free under Apache 2.0 with unlimited usage. OpenLIT Cloud is coming soon for fully hosted teams.
- [About OpenLIT](https://openlit.io/about-us.md): OpenLIT is building the open source Harness Engineering platform for production AI systems.
- [OpenLIT vs Alternatives](https://openlit.io/compare.md): Compare OpenLIT against Langfuse, Helicone, LangSmith, and Datadog for LLM observability.
- [OpenLIT vs Langfuse](https://openlit.io/compare/openlit-vs-langfuse.md): Compare OpenLIT and Langfuse for LLM observability. See how OpenTelemetry-native monitoring, GPU tracking, and self-hosted deployment stack up.
- [OpenLIT vs Helicone](https://openlit.io/compare/openlit-vs-helicone.md): Compare OpenLIT and Helicone for LLM observability. OpenLIT is SDK-based with no proxy latency, OpenTelemetry-native, and fully self-hostable.
- [OpenLIT vs LangSmith](https://openlit.io/compare/openlit-vs-langsmith.md): 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](https://openlit.io/compare/openlit-vs-datadog.md): 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.

## HTML pages

- Home: https://openlit.io/
- Pricing: https://openlit.io/pricing
- About: https://openlit.io/about-us
- Compare: https://openlit.io/compare
- Blog: https://openlit.io/blogs

## Full content dump

- https://openlit.io/llms-full.txt

## Product documentation

- Docs llms.txt: https://docs.openlit.io/llms.txt
- Docs overview: https://docs.openlit.io/latest/overview
- Quickstart: https://docs.openlit.io/latest/openlit/quickstart-ai-observability

## Project

- GitHub: https://github.com/openlit/openlit
- License: Apache 2.0
- Contact: contact@openlit.io