✓
Tool
Category
Pricing
Free?
Updated
Weights & Biases Weave
AI Agents
Freemium
✓
Mar 2026
→
W&B toolkit for tracing, evaluating, and improving AI agent applications
Best for: W&B
Galileo AI
AI Agents
From $1/mo
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Mar 2026
→
AI quality management platform for automated LLM evaluation and hallucination detection
Best for: evaluation
Langfuse
AI Agents
Freemium
✓
Mar 2026
→
Open-source LLM observability platform for tracing, debugging, and monitoring AI agents
Best for: observability
LangSmith
AI Agents
Freemium
✓
Mar 2026
→
Developer platform for debugging and monitoring LangChain-based AI agent applications
Best for: LangChain
Helicone
AI Agents
Freemium
✓
Mar 2026
→
Open-source LLM proxy for logging, monitoring, and analyzing all AI API calls
Best for: LLM-proxy
Vertex AI Reasoning Engine
AI Agents
Paid
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Mar 2026
→
Google Cloud managed runtime for deploying and scaling AI agents in production
Best for: Google Cloud