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RunVouch vs Langfuse
Langfuse is excellent open-source LLM observability: traces, evals, prompt management. RunVouch is not a tracing tool — it's the watchdog that tells you a scheduled agent is broken or expensive, without instrumenting your code.
| Langfuse | RunVouch | |
|---|---|---|
| Traces, spans, prompt versions, evals | yes | no |
| Requires SDK in your code | yes | no — wrap the command or install the plugin |
| Missed-run / dead man's switch | no | yes |
| Evidence the task was done | no | yes |
| Retry-storm alert | you can find it in traces | automatic |
| Hard cost cap + pause | dashboards | yes |
| Pricing | free self-host; cloud per unit | free 3 agents; $9 / $29 |
When to use which
They're complementary. Langfuse answers "why did this prompt produce that"; RunVouch answers "did last night's agent run, finish, prove it, and stay under budget". If you only want the second, you don't need the first.