Postman vs Langfuse

Postman

Langfuse

Postman · 17 features

• API Documentation — Public + private docs from collections.
• API Versioning — Manage multiple API versions.
• Collection Runner — Run N iterations with data.
• Collections — Saved request groups + runners.
• Desktop App — Native Mac/Win/Linux.
• Environments — Per-env variables.
• Flows (low-code) — Visual workflow builder.
• Governance — API design rules enforcement.
• Mock Servers — Auto-generated mocks.
• Monitors — Scheduled collection runs + alerts.
• Newman CLI — CI/CD collection runner.
• Postman AI — Generate tests + docs with AI.
• Pre-request / Test Scripts — JS scripts + assertions.
• Public API Network — Discoverable APIs marketplace.
• Request Builder — GUI for any HTTP request.
• Request History — Per-user request log.
• VS Code Extension — Requests inside VS Code.

Langfuse · 16 features

• Annotation Queues — Human reviewers rate traces. Unlimited on Pro+.
• Dashboards — Aggregate metrics, cost, quality across projects.
• Datasets — Curate test sets from production traces. Run experiments.
• EU Cloud Region — GDPR-compliant hosting in EU.
• Evaluations — LLM-as-judge, manual scores, custom model-graded evaluators.
• LLM Cost Tracking — Automatic cost calculation per provider/model.
• OpenTelemetry Native — OTel SDK → Langfuse endpoint works out of box.
• Playground — Test prompts + models + variables live.
• Prompt Management — Version, tag, label prompts. Reference from code by label.
• Public API — Full REST API for ingest, query, prompt management.
• Python @observe decorator — One-line decorator to trace any function.
• Self-Hosting — Docker Compose + k8s Helm chart.
• Sessions — Group related traces (conversations, agent runs).
• Tracing — Capture every LLM call, tool call, nested span with inputs/outputs/cost.
• Users Tracking — Segment traces by user ID, track per-user cost.
• Webhooks — Subscribe to trace completion events.