Helicone
by Community
🧊 Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23 🍓
OSS
Helicone
Added 1 June 2026
Overview
Helicone is an open source observability platform for LLMs. It requires one line of code to integrate and provides monitoring, evaluation, and experimentation capabilities. The project is part of Y Combinator's Winter 2023 batch and is written in TypeScript.
Best for
Best for
LLM developers who need lightweight observability without heavy setup
Use cases
- Monitor LLM API usage and latency
- Evaluate prompt and response quality
- Experiment with different models and prompts
Notes
Helicone is an open source observability platform for LLMs. It requires one line of code to integrate and provides monitoring, evaluation, and experimentation capabilities. The project is part of Y Combinator’s Winter 2023 batch and is written in TypeScript.
5,766 stars on GitHub. Last updated 2026-05-18. Licensed Apache-2.0.
Use cases
- Monitor LLM API usage and latency
- Evaluate prompt and response quality
- Experiment with different models and prompts
Pros
- Quick integration with one line of code
- Open source with community support
- Combines monitoring and evaluation in one tool
Cons
- Limited to TypeScript ecosystem
- May require self-hosting for full control
- Young project with evolving features
Indexed from awesome-llmops and enriched against its public facts.
Pros
- Quick integration with one line of code
- Open source with community support
- Combines monitoring and evaluation in one tool
Cons
- Limited to TypeScript ecosystem
- May require self-hosting for full control
- Young project with evolving features
Pairs with
Other entries in the index that connect to this one. Click through to see the chain.
LangChain
Community
The agent engineering platform.
LiteLLM 🚅
Community
Python SDK, Proxy Server (AI Gateway) to call 100+ LLM APIs in OpenAI (or native) format, with cost tracking, guardrails, loadbalancing and logging. [Bedrock, Azure, OpenAI, Vertex