# Braintrust vs Langfuse: which LLM evals + tracing platform should you ship in 2026?

**Source:** https://promtable.com/compare/braintrust-vs-langfuse

> Braintrust is the polished commercial evals platform with strong UX. Langfuse is the open-source observability + prompt-registry leader with self-host. Pick Braintrust for polish, Langfuse for OSS + self-host.

---
Braintrust is the polished commercial evals platform with strong UX. Langfuse is the open-source observability + prompt-registry leader with self-host. Pick Braintrust for polish, Langfuse for OSS + self-host.

## At a glance

| Dimension | Braintrust | Langfuse |
|---|---|---|
| Open source / self-host | Closed cloud | **Open source + self-host** ✓ |
| Evals UX | **Polished, best in class** ✓ | Solid |
| Tracing depth | Strong | **Strongest in OSS** ✓ |
| Prompt registry | First class | First class |
| LLM-as-judge ergonomics | **Excellent — built-in** ✓ | Solid |
| Production sampling + grading | First class | First class |
| SDK coverage | Python + TypeScript | **Python + TypeScript + Java + Go** ✓ |
| Pricing | Cloud subscription | **Free OSS + paid cloud** ✓ |

## Verdict

Braintrust is the right pick for teams that want the most polished evals + tracing experience and don't need self-host. Langfuse is the right pick for teams that want open source, self-host, broader SDK coverage, or a free-tier-friendly OSS path. Both are credible in 2026; pick by hosting preference and budget.

## When to pick which

- **Braintrust** — Polished commercial UX, strong LLM-as-judge ergonomics, cloud-first.
- **Langfuse** — Open source, self-host, broader SDK, OSS-friendly stack.

## FAQ

### Braintrust or Langfuse in 2026?

Braintrust for polished cloud workflow; Langfuse for OSS + self-host.

### Cheapest of the two?

Langfuse OSS is free; Langfuse cloud is competitive on price.

### Best for prompt registry?

Both are competitive; pick based on which surface (evals vs tracing) is your primary use.

## Related

- [/guides/ai-evals-observability-2026](https://promtable.com/guides/ai-evals-observability-2026)
- [/glossary/evals](https://promtable.com/glossary/evals)
- [/glossary/prompt-versioning](https://promtable.com/glossary/prompt-versioning)

*Last updated: 2026-06-01*
---

Original page: https://promtable.com/compare/braintrust-vs-langfuse
Maintained by Promtable (https://promtable.com). Content: CC BY 4.0. Cite as "Promtable — https://promtable.com/compare/braintrust-vs-langfuse".
Contact: info@vibecodingturkey.com.