Helicone

Free tier

AI Gateway & LLM Observability for building reliable AI applications

Free tier available·Technical·API available·Open source

Key strengths

Unified AI gateway supporting OpenAI, Anthropic, Azure, and many more providersLLM observability with request logging, session tracking, and user analyticsPrompt management with datasets and playground for iterative improvementRate limiting and alerting for production reliabilityFast integration — route traffic through Helicone with a single line change

Free tier + paid plans

San Francisco, United States

Founded 2023

Self-hostable

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Helicone operates as a high-performance AI gateway and observability layer that proxies LLM API calls with minimal latency overhead. It integrates with providers including OpenAI, Anthropic, Azure OpenAI, LiteLLM, Anyscale, Together AI, and OpenRouter via a simple base URL swap or SDK wrapper. The platform captures full request/response logs, enabling rich dashboards with metrics on cost, latency, token usage, error rates, and custom segments. Helicone also provides a Datasets and Playground feature for prompt engineering, plus rate limiting and alerting primitives for production safeguards.

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The AI Native Cloud — full-stack platform for inference, compute, and model shaping

Usage-based pricing for serverless inference (per token), batch inference, provisioned throughput (token-based capacity with SLAs), dedicated model inference, and dedicated container inference. GPU compute clusters also available.

GPU ClustersModel LibraryInference APIsFine-tuning+1

Free tierDevAPI

Open-source models (e.g., DeepSeek, Gemma, Llama, Qwen, GLM, MiniMax, Kimi)Popular