Database · ai-tools
Langfuse
An open-source platform for LLM observability, evaluation, metrics, prompt management, playgrounds, and datasets.
LLM observability and evaluation platform
Overview
A current open-source option for readers comparing tools to observe and evaluate LLM applications, with public cloud-pricing context.
Details
- Website
- https://langfuse.com/
- Pricing model
- Cloud Hobby is free. Official pricing lists 0–100k units free, then usage tiers beginning at $8 per 100k units; self-hosting is also offered.
- Platform
- Cloud service and self-hosted deployments
- Privacy relevance
- Observability tooling can collect prompts, outputs, traces, and datasets; assess retention, access controls, hosting, and connected-model settings before use.
- Strengths
- Observability and evaluation features; free cloud allowance; self-hosting option; open-source project.
- Limitations
- Usage costs apply beyond the free allowance; telemetry may contain sensitive application data unless collection and hosting are configured carefully.
- Last reviewed
- 2026-08-30