# Langfuse vs W&B Weave

Langfuse is freemium — a usable free tier with paid plans above it. W&B Weave is freemium — a usable free tier with paid plans above it.

| | Langfuse | W&B Weave |
|---|---|---|
| Pricing | Free tier + paid plans | Free tier + paid plans |
| Free to start | Yes | Yes |
| Category | AI Models & Local Execution | AI Models & Local Execution |
| Type | LLM Eval & Observability | LLM Eval & Observability |
| Best for | Fully open-source and self-hostable for free via Docker Compose/Kubernetes, not just a hosted SaaS | Agent-native tracing model with sessions, steps, tools and sub-agents as first-class concepts (not generic spans) |

## FAQ

### Langfuse vs W&B Weave: what is the difference?

Langfuse is freemium — a usable free tier with paid plans above it and is listed for fully open-source and self-hostable for free via Docker Compose/Kubernetes, not just a hosted SaaS. W&B Weave is freemium — a usable free tier with paid plans above it and is listed for agent-native tracing model with sessions, steps, tools and sub-agents as first-class concepts (not generic spans). Both sit in LLM Eval & Observability.

### Is Langfuse or W&B Weave cheaper to start with?

Neither — Langfuse and W&B Weave are both freemium, so the choice comes down to capability rather than cost. Both entries list what they uniquely do above.

### Which should I choose, Langfuse or W&B Weave?

Choose Langfuse if you need fully open-source and self-hostable for free via Docker Compose/Kubernetes, not just a hosted SaaS; choose W&B Weave if you need agent-native tracing model with sessions, steps, tools and sub-agents as first-class concepts (not generic spans). Flocci AI Tools does not rank one above the other — it shows both feature sets side by side and lets the requirement decide.

## Related

- [Langfuse](https://aitools.flocci.in/tool/langfuse)
- [W&B Weave](https://aitools.flocci.in/tool/w-b-weave)
- [Langfuse alternatives](https://aitools.flocci.in/alternatives/langfuse)
- [W&B Weave alternatives](https://aitools.flocci.in/alternatives/w-b-weave)
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Source: Flocci AI Tools — https://aitools.flocci.in/compare/langfuse-vs-w-b-weave

Facts last verified: October 2026