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Tool
Category
Pricing
Free?
Updated
Helicone
AI Agents
Freemium
✓
Mar 2026
→
Open-source LLM proxy for logging, monitoring, and analyzing all AI API calls
Best for: LLM-proxy
Langfuse
AI Agents
Freemium
✓
Mar 2026
→
Open-source LLM observability platform for tracing, debugging, and monitoring AI agents
Best for: observability
PromptLayer
AI Agents
Freemium
✓
Mar 2026
→
Prompt management platform with logging and analytics for LLM API calls
Best for: prompt-management