Helicone
Open-source observability layer for LLM API calls.
Best use cases
• LLM request monitoring
• Cost tracking
• Latency analysis
• Prompt logging
• Production debugging
Pros
• Open source
• Provider-agnostic
• Easy API-level integration
• Cost and usage tracking
• Works well in production
Cons
• Less opinionated guidance than LangSmith
• UI is more utilitarian
• Advanced features require hosted plan
Pricing
freemium
Free open-source version + paid hosted plans
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