Langfuse vs Respan
A side-by-side comparison of Langfuse and Respan, two Observability tools, drawn from Ignaite's continuously-verified listings.
Compared from listings verified as of
Langfuse
ObservabilityOpen-source LLM observability. Self-hostable, OpenTelemetry-native.
View LangfuseAt a glance
| Attribute | Langfuse | Respan |
|---|---|---|
| Category | Observability | Observability |
| Pricing | FREEMIUM | FREEMIUM |
| License (differs) | Open core | Proprietary |
| Deployment (differs) | Hybrid | Cloud |
| Platforms | API, Web | API, Web |
| Model support | Model-agnostic | Model-agnostic |
| Vendor (differs) | Langfuse | Keywords AI, Inc. |
| Capabilities (differs) |
|
|
The honest brief
Langfuse
The MIT-licensed, self-hostable answer to LangSmith — own your observability data, framework-agnostic.
- Own your observability data
- Framework-agnostic, OTel-native
- Tracing + evals + prompt mgmt
- Transparent unit-based pricing
- Self-host infra cost at scale
- Less deep LangChain integration
- Setup heavier than hosted-only
Respan
Bundles an AI gateway, observability, and an automated eval agent in one loop — detect, decide, and fix in production without stitching tools.
- Trace trees, dashboards, and alerts
- 500+ models via one endpoint
- Rule checks, AI judges, human review
- Spend caps and fallback routing
- Generous free tier (100k logs)
- Proprietary, no self-host option
- Recent rebrand can confuse search
- Team tier jumps to $199/mo
When to pick which
Both cover LLM observability and LLM evaluation.
Pick Langfuse if you need Prompt management.
- Prompt management (secondary capability)
Pick Respan if you need LLM gateway / routing and Multi-model access.
- LLM gateway / routing (primary capability)
- Multi-model access (primary capability)
Langfuse leans on LLM observability as a headline capability; Respan treats it as secondary.
- LLM observability (primary capability)
They also differ on:
- License
- Open core · Proprietary
- Deployment
- Hybrid · Cloud