Helicone vs OpenRouter (2026)
Updated April 29, 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.
OpenRouter is an LLM gateway with one OpenAI-compatible API for 500+ models from 80+ providers, billed at provider rates plus a platform fee.
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
- One OpenAI-compatible API for 500+ models from 80+ providers
- Auto-routing across providers
- Budgets and management API keys
- Prompt caching
- Bring your own keys, fee-free up to $25,000 a month
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
- One key and one bill across 80+ providers
- Model calls billed at provider rates
- Free plan for prototyping on free models
- BYOK fee-free up to $25,000 of list-price inference a month
- Broadcast sends request traces to tools like Langfuse and Datadog
Cons
- Platform fee of 5.5% on Standard and 8% on Business, with a $0.80 minimum on card purchases
- Doesn't score or evaluate outputs, so quality checks happen in another tool
- Credits may be expired one year after purchase
- Free plan capped at 50 requests a day until you've bought $10 in credits
Helicone or OpenRouter — 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 OpenRouter if you wantChoose if you want
- Building model-agnostic apps that switch providers freely
- Accessing many providers with one key and one bill
- Comparing models side by side from a single API
- Tracking spend per API key
- Prototyping on free models
Compare the models
How Helicone's and OpenRouter's models score on public benchmarks, and their live API status.
Compare Helicone and OpenRouter 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 1,000+ models through one gateway.
Try Respan free