Helicone
Add full LLM observability, cost tracking, and caching by changing one line of code. Helicone proxies your API calls and logs everything instantly.
Overview
Helicone is an LLM observability and proxy platform that sits between your application and any LLM provider — logging every request, tracking costs, measuring latency, and enabling caching with a single line of code change. Where Langfuse requires SDK integration throughout your codebase, Helicone works as a proxy: swap one URL and you instantly get full observability without modifying application code. It supports OpenAI, Anthropic, Mistral, and custom models, and includes features for prompt management, A/B testing different model configurations, and sharing dashboards with stakeholders. Used by teams that need quick visibility into LLM usage without a major engineering lift.
Key Features
- Proxy-based setup — one line of code
- Cost and latency dashboards
- Prompt versioning
- Caching to reduce API costs
- A/B testing models
- Team dashboards
- • Fastest observability setup in the category — no SDK required
- • Significant cost savings from intelligent caching
- • Works with all major LLM providers
- • Proxy adds a small latency overhead
- • Less evaluation depth than Langfuse or Braintrust