Langfuse vs Traceloop / OpenLLMetry
Facts come from each vendor's own pages; download numbers are the headline package of each tool in 2026-W40.
| Fact | Langfuse | Traceloop / OpenLLMetry |
|---|---|---|
| PyPI downloads, week (rank) | 6,306,471 (#3)langfuse | 455,110 (#11)traceloop-sdk |
| npm downloads, week (rank) | 3,268,181 (#2)@langfuse/tracing | 147,877 (#8)@traceloop/node-server-sdk |
| GitHub stars (rank) | 35,491 (#2)langfuse/langfuse | 7,474 (#15)traceloop/openllmetry |
| PyPI series (12 weeks) | ||
| npm series (12 weeks) | ||
| Categories | Tracing & observability, Evaluation, Prompt management | Tracing & observability, Evaluation, Prompt management |
| Status | Generally available | Generally available |
| Licence | MIT (open core) | Apache-2.0 (open core) |
| Self-host | Yes | Enterprise only |
| OpenTelemetry | Native (OTLP) | Native (OTLP) |
| Pricing model | usage | contact |
| Entry price | $29/mo; Core cloud plan, 100k units/month included then $8/100k units; Hobby is free (50k units/month); self-hosting is a separate free option | Contact sales; Free Forever plan $0/mo (up to 50K spans/month, 5 seats, 24 h retention); Enterprise is 'Let's chat' with no published price. OpenLLMetry SDK itself is free. |
| Free tier | Yes | Yes |
| Measurability | Measured (mapped SDK packages) | Measured (mapped SDK packages) |
| Sources | pricing · licence · self-host · OTel (checked 2026-10-07) | pricing · licence · self-host · OTel (checked 2026-10-07) |
More downloads means more package installs (including CI and dependencies), not a better product. See the methodology.