✓
Tool
Category
Pricing
Free?
Updated
Portkey AI
AI Agents
Freemium
✓
Mar 2026
→
AI gateway providing unified LLM access with reliability features and observability
Best for: AI-gateway
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
LlamaIndex ✓
AI Agents
Freemium
✓
Mar 2026
→
Framework for building production RAG systems and data-connected AI agents
Best for: rag
Gemini 3.1 Pro ✓
AI Writing
Freemium
✓
Mar 2026
→
Google's benchmark-leading AI with 77.1% ARC-AGI-2 score and multimodal capabilities.
Best for: ai-assistant
Humanloop
AI Agents
Freemium
✓
Mar 2026
→
Collaborative platform for prompt management, evaluation, and LLM fine-tuning
Best for: prompt-management
n8n
AI Automation
Freemium
✓
Mar 2026
→
Open-source workflow automation with AI agents, self-hosting, and 400+ integrations.
Best for: automation
Weights & Biases Weave
AI Agents
Freemium
✓
Mar 2026
→
W&B toolkit for tracing, evaluating, and improving AI agent applications
Best for: W&B
LangSmith
AI Agents
Freemium
✓
Mar 2026
→
Developer platform for debugging and monitoring LangChain-based AI agent applications
Best for: LangChain
Arize Phoenix
AI Agents
Freemium
✓
Mar 2026
→
Open-source AI observability tool with interactive tracing and RAG evaluation
Best for: observability