LangSmith
Native tracing for LangChain and LangGraph
37 Best Respan Alternatives & Competitors (2026)
The top alternatives to Respan in the Observability, Prompts & Evals space, compared on features, pricing, and what they're best at.
Updated February 28, 2026
Why look beyond Respan?
Respan is the AI router with built-in observability and automated evals, and its AI observability turns every LLM call, tool run, retrieval, and agent turn into a span in one nested trace, each with its own input, output, latency, and cost. Threads group multi-turn sessions, so a bad output on turn five traces back to the context set on turn two.
Common reasons users explore alternatives
- The free plan retains data for 7 days
- The free plan includes 1k scores and 2 evaluators
- Ingestion throughput is metered per tier, starting at 412 logs per minute on Free
Top alternatives to Respan
MLflow
OpenTelemetry-based tracing for LLMs and agents
Weights & Biases
ML experiment tracking
Arize AI
ML observability with LLM support
Langfuse
Tracing for LLM calls, tool runs, and agent steps
Traceloop
OpenTelemetry
Helicone
Datadog LLM
LLM monitoring within Datadog platform
HoneyHive
Prompt management
Braintrust
Experiments comparing prompts and models
Promptfoo
Patronus AI
Automated LLM evaluation platform
Phoenix
OpenTelemetry-based LLM and agent tracing
Portkey
Humanloop
DeepEval
Sentry
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
Future AGI
Multimodal evaluation (text, image, audio, video)
Lunary
Parea AI
Chamber
ML infrastructure automation
Athina AI
Moda
Hallucination detection
Ashr
Multi-modal synthetic testing
Sentrial
Agent failure root cause analysis
Fiddler AI
Agentic observability across multi-step agent workflows
Laminar
Agent tracing with a readable transcript view
AgentOps
Session replay with time-travel debugging
OpenObserve
Logs, metrics, traces, RUM, and session replay
Run Observability, Prompts & Evals in production with Respan
One platform for routing, observability, tracing, and evals across every LLM provider.
Compare Respan alternatives with Respan
10KFree traces/mo
1,000+Models
5 minSetup
Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 1,000+ models through one gateway.
Try Respan free