Observability
14 toolsOSSFreePopular
Langfuse
OSS LLM engineering platform (acquired by ClickHouse, Jan 2026)
⭐ 7,000
OSSFree
MLflow
Open-source MLOps platform with LLM experiment tracking and tracing
⭐ 19,800
OSSFree
Opik
Open-source LLM tracing and evaluation platform by Comet
⭐ 4,200
OSSFree
Arize Phoenix
ML/LLM observability and evaluation platform
⭐ 4,000
Free
AgentOps
Observability and replay platform built specifically for AI agents
⭐ 3,100
OSSFree
Helicone
LLM observability, cost tracking, request logging
⭐ 2,500
OSSFree
Traceloop
OpenTelemetry-based LLM observability
⭐ 2,000
OSSFree
LangWatch
LLM observability and evaluation with OpenTelemetry support
⭐ 2,000
Free
LangSmith
LLM tracing, evaluation, and dataset management
Free
Braintrust
AI evaluation platform with datasets and prompt mgmt
Free
Logfire
Observability platform by the Pydantic team
Free
Weights & Biases
ML experiment tracking and LLM evaluation
Free
Maxim AI
Agent-specific testing and observability platform
Free
Galileo
Real-time LLM evaluation with sub-200ms guardrail models
Other categories
Coding Assistants (24)Autonomous Agents (11)Agent Frameworks (17)Pipelines & RAG (12)LLM Infrastructure (43)Design & UI (11)DevOps & CI/CD (6)Documentation (9)Product & PM (6)MCP Servers (15)Prompt & Eval (9)Specifications (10)Spec-Driven Dev (3)AI Code Review (3)Fine-tuning (6)Voice AI (10)Multimodal (10)Browser Automation (7)Memory & Persistence (4)AI Guardrails (5)