Helicone vs Stainless
Updated March 10, 2026
Overview
Helicone is an open-source LLM observability and proxy platform. By adding a single line of code, developers get request logging, cost tracking, caching, rate limiting, and analytics for their LLM applications. Helicone supports all major LLM providers and can function as both a gateway proxy and a logging-only integration.
Powers the official SDKs for OpenAI, Anthropic, and others. The de facto gateway interface layer.
Key features
Core capabilities each platform advertises.
- LLM observability and monitoring
- Cost tracking and analytics
- Request caching
- Rate limiting and user management
- Open-source with managed option
- SDK generation
- API interface
- Type-safe clients
Strengths and tradeoffs
What each tool does well, and the limitations to keep in mind.
Pros
- Extremely simple integration (one line of code)
- Open-source with self-hosting option
- Generous free tier (100k requests)
- Supports all major LLM providers
Cons
- Advanced features require paid tiers
- Data retention limited on free tier
- Self-hosting requires technical expertise
Pros
- Automates SDK dev
- Type-safe code
- Multi-language
Cons
- Requires OpenAPI
- Limited customization
Helicone or Stainless — which should you choose?
Choose Helicone if you wantChoose if you want
- LLM cost monitoring and optimization
- Production request debugging
- User-level usage tracking and rate limiting
- Caching to reduce latency and cost
- Team-wide LLM spend management
Choose Stainless if you wantChoose if you want
Compare Helicone and Stainless on your own traffic
Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 500+ models through one gateway.