---
title: "Braintrust vs Langfuse: Which is Better in 2026? | App Stack Builder"
description: "Braintrust vs Langfuse compared for 2026 — pricing, free tiers, features, pros & cons. See which llm observability & evals tool is the better fit for your startup."
source: https://appstackbuilder.com/compare/braintrust-vs-langfuse
retrieved: 2026-10-07
---

![](https://www.google.com/s2/favicons?domain=braintrust.dev&sz=128)

vs

![](https://www.google.com/s2/favicons?domain=langfuse.com&sz=128)

# Braintrust vs Langfuse: Which is Better in 2026?

LLM Observability & Evals

Choosing between [Braintrust](https://appstackbuilder.com/tools/braintrust) and [Langfuse](https://appstackbuilder.com/tools/langfuse)? Both are popular llm observability & evals tools. Below we compare them on pricing, free tiers, features, and pros & cons so you can pick the right fit for your stack.

Quick verdict

Both are solid llm observability & evals options. Langfuse is cheaper to start, but the right choice depends on the specific features and integrations you need.

## Braintrust vs Langfuse — Side by Side

|                | Braintrust                             | Langfuse                                       |
| -------------- | -------------------------------------- | ---------------------------------------------- |
| Category       | LLM Observability & Evals              | LLM Observability & Evals                      |
| Pricing        | Free · paid from $249/mo               | Free · paid from $29/mo                        |
| Starting price | Free tier available                    | Free tier available                            |
| Free tier      | ✓                                      | ✓                                              |
| Rating         | 4.6                                    | 4.7                                            |
| Best for       | LLM Observability & Evals — llm, evals | LLM Observability & Evals — llm, observability |

## Pros & Cons

![](https://www.google.com/s2/favicons?domain=braintrust.dev&sz=128)

[Braintrust](https://appstackbuilder.com/tools/braintrust)

* ✓Strongest eval and experiment workflow in the category
* ✓Unlimited users, so PMs and domain experts can review outputs
* ✓Generous startup program
* ✗$0 to $249 is a steep step with nothing in between
* ✗Closed source, and only Enterprise can self-host
* ✗Short default retention on both self-serve plans

![](https://www.google.com/s2/favicons?domain=langfuse.com&sz=128)

[Langfuse](https://appstackbuilder.com/tools/langfuse)

* ✓Genuinely open source and self-hostable
* ✓Unit pricing does not punish adding teammates
* ✓Framework-agnostic: OpenTelemetry, LangChain, LlamaIndex, raw SDKs
* ✓Prompt management and evals in the same tool as tracing
* ✗Self-hosting at scale means running ClickHouse, Postgres and Redis
* ✗Units add up quickly for agent traces with many spans
* ✗Longer retention is gated behind the $199 plan

## Key Features Compared

### Braintrust

* ✓5 GB processed data (+$3/GB)
* ✓50k scores (+$1.50 / 1k)
* ✓30-day retention
* ✓Unlimited users
* ✓6–12 months free for qualifying startups

### Langfuse

* ✓100k units / month included
* ✓$8 per extra 100k units
* ✓Unlimited users
* ✓90 days of data access

### Choose Braintrust if…

* ✓You want a free tier to validate before paying.
* ✓Strongest eval and experiment workflow in the category
* ✓Unlimited users, so PMs and domain experts can review outputs
* ✓Generous startup program
[Braintrust review & pricing ](https://appstackbuilder.com/tools/braintrust)

### Choose Langfuse if…

* ✓You want a free tier to validate before paying.
* ✓Budget is tight — paid plans start lower ($29/mo vs $249/mo).
* ✓Genuinely open source and self-hostable
* ✓Unit pricing does not punish adding teammates
[Langfuse review & pricing ](https://appstackbuilder.com/tools/langfuse)

## Frequently Asked Questions

Is Braintrust better than Langfuse?⌄

Both are solid llm observability & evals options. Langfuse is cheaper to start, but the right choice depends on the specific features and integrations you need.

What is the difference between Braintrust and Langfuse?⌄

Braintrust — Eval-first AI observability with unlimited users on every plan. It is priced on data processed and scores run, not seats. Langfuse — Open-source LLM tracing, evals and prompt management: MIT-licensed, self-hostable, and $29/month in the cloud with unlimited users. Both are llm observability & evals tools; the comparison table above breaks down pricing, free tiers, and what each is best for.

Braintrust vs Langfuse: which is cheaper?⌄

Braintrust pricing: Free · paid from $249/mo. Langfuse pricing: Free · paid from $29/mo. Confirm current pricing on each tool's official site, as plans change.

Which is rated higher, Braintrust or Langfuse?⌄

In our catalog, Braintrust rates 4.6 out of 5 and Langfuse rates 4.7 out of 5, so Langfuse has a slight edge on reviews.

See more options in our guide to the [best llm observability & evals tools for startups](https://appstackbuilder.com/categories/llm-observability).

## Still not sure which to pick?

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