# Helicone

> AI observability platform for monitoring and debugging LLM applications.

Helicone is an open-source LLM observability platform that provides logging, monitoring, caching, and cost analytics for AI applications with a single line of code change. It captures every LLM request with full prompt and response details, latency, token counts, and costs — providing the visibility needed to debug AI applications, optimize prompt performance, and control API spending. AI engineers building production LLM applications use Helicone to maintain operational awareness of their AI systems, identify performance bottlenecks, and make data-driven decisions about model selection and prompt optimization.

## Quick facts

- Categories: Data Analysis, Developer Tools
- Pricing: Freemium (free plan + paid tiers)
- Free plan: Yes
- Official site: https://helicone.ai
- Last checked: 2026-10-23

## Key features

- LLM observability and logging
- Cost tracking across providers
- Prompt caching analytics
- Request routing
- Evaluation tools
- Open-source platform

## Use cases

- Monitoring LLM API costs
- Debugging AI application issues
- Comparing model performance
- Optimizing LLM infrastructure

## Links

- Nextool.ai page: https://nextool.ai/tools/helicone/
- Alternatives: https://nextool.ai/alternatives/helicone/

Source: Nextool.ai (https://nextool.ai/tools/helicone/). Pricing and features change; confirm on the provider's site before relying on them.