Respan
LLM tracing, evals, and gateway
The top alternatives to Sentrial in the Observability, Prompts & Evals space, compared on features, pricing, and what they're best at.
Updated March 27, 2026
Sentrial is a production monitoring platform purpose-built for AI agents — positioned as "Datadog for Agent Reliability." Part of YC W2026, it was founded by Neel Sharma (CEO, UC Berkeley CS, ex-Sense) and Anay Shukla (UC Berkeley CS, deployed DevOps agents at Accenture).
Respan
LLM tracing, evals, and gateway
LangSmith
Trace visualization for LLM chains
Weights & Biases
ML experiment tracking
MLflow
OpenTelemetry-native tracing
Arize AI
ML observability with LLM support
Langfuse
Open-source LLM observability
Helicone
Datadog LLM
LLM monitoring within Datadog platform
Traceloop
OpenTelemetry
Braintrust
Real-time LLM logging and tracing
HoneyHive
Prompt management
Patronus AI
Automated LLM evaluation platform
Promptfoo
Phoenix
OpenTelemetry-based LLM and agent tracing
Portkey
Humanloop
Sentry
DeepEval
Ragas
RAG-specific evaluation framework
LangWatch
Multi-turn agent simulation testing
Galileo AI
LLM output quality evaluation
PromptLayer
Maxim AI
Distributed tracing for LLM and agent apps
Confident AI
DeepEval open-source evaluation framework
Opik
Agenta
Lunary
Future AGI
Multimodal evaluation (text, image, audio, video)
Parea AI
Moda
Hallucination detection
Ashr
Multi-modal synthetic testing
Athina AI
Chamber
ML infrastructure automation
One platform for routing, observability, tracing, and evals across every LLM provider.
Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 500+ models through one gateway.
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