Compare Tools
Pick a category, then select 2–3 tools to compare side by side.
Category
Select 2–3 tools to compare
Datadog
LangfuseLlm Tracing
Cost Tracking
Evaluation
Prompt Management
Real Time Monitoring
Pricing
Free tier (5 hosts)$15/host/mo Infrastructure$31/host/mo APMCustom Enterprise
Free (self-hosted)Free cloud (50k observations)$59/mo ProCustom Enterprise
Open Source
Self-Hosted
SDK Languages
pythonjavascriptgojavarubycsharpphp
pythonjavascripttypescript
Frameworks
langchainopenai-agents
langchainllamaindexvercel-aiopenai-agents
Compliance
soc2hipaagdprpci-dssiso27001
soc2gdpr
Best For
Full-stack observability at scale — infrastructure, APM, logs, and LLM tracing in one platform
Open-source LLM tracing, prompt management, and evaluation — self-hostable with broad framework support
Limitations
Expensive at scale; LLM observability is newer and less mature than dedicated tools like Langfuse; vendor lock-in on proprietary data format
Smaller ecosystem than Datadog; self-hosted requires Postgres + ClickHouse; evaluation features are still maturing
Supported Not supported Unverified