# Helicone

> Open-source LLM observability with prompt versioning and cost tracking.

- Official site: https://www.helicone.ai
- Category: Prompt Management & Testing
- Pricing: Open Source
- Works with: Most LLM providers
- Tags: open source, observability, cost
- Listed on TellPrompt: https://tellprompt.com/tool/helicone

## About

Helicone sits between your app and the model provider to log requests, track costs and manage prompt versions.

Useful if cost visibility matters as much as prompt quality.