# Langfuse

29 Hacker News commenters recommended Langfuse and 12 criticized it, November 2025 to November 2026. It was recommended in 9 of 13 months. It meets the Hacker Approved badge rule.

**Verdict:** People recommend it for tracing and debugging LLM calls, with OpenTelemetry support and a self-hostable option. The most common caveat is confusing documentation and a hard implementation.

## Why people recommend it

- Strong tracing and debugging support (5 comments): "Langfuse/LangSmith are useful for cost tracking and debugging post-hoc." ([source](https://news.ycombinator.com/item?id=47321343)) "Langfuse + custom OTEL spans has been the most practical combo for us" ([source](https://news.ycombinator.com/item?id=47321314)) "Langfuse is great for debugging technical issues on individual traces" ([source](https://news.ycombinator.com/item?id=48110594))
- Works well with OpenTelemetry (3 comments): "We like Langfuse for observability via OpenTelemetry. Prompt management is too basic for our needs." ([source](https://news.ycombinator.com/item?id=46663717)) "if you want to mix Sentry, Langfuse, Datadog, etc, OTel is still probably the best option" ([source](https://news.ycombinator.com/item?id=49396804)) "Langfuse + custom OTEL spans has been the most practical combo for us" ([source](https://news.ycombinator.com/item?id=47321314))
- Well-liked go-to observability tool (3 comments): "Langfuse has been my favorite LLM observability solution so far." ([source](https://news.ycombinator.com/item?id=46657787)) "Langfuse is by far the best of the langs" ([source](https://news.ycombinator.com/item?id=46651042)) "I love langfuse, it is my goto." ([source](https://news.ycombinator.com/item?id=46657767))
- Integrates with LiteLLM and frameworks (3 comments): "Langfuse has ongoing conferences and is still used by many frameworks." ([source](https://news.ycombinator.com/item?id=48022564)) "it's got nice integration with langfuse for observability" ([source](https://news.ycombinator.com/item?id=46299429)) "Eventually I chose litellm+langfuse" ([source](https://news.ycombinator.com/item?id=46657214))

## What people warn about

- Confusing docs and hard implementation (3 comments): "I struggled a lot with actually implementing langfuse due to numerous bugs/confusing AI driven documentation" ([source](https://news.ycombinator.com/item?id=46656961)) "I think the docs are great to read, but implementing was a completely different story for me" ([source](https://news.ycombinator.com/item?id=46657025)) "maybe clickhouse can finally make sense of the langfuse documentation" ([source](https://news.ycombinator.com/item?id=46656691))
- GDPR concerns after ClickHouse acquisition (3 comments): "Since clickhouse is headquartered in the US that means the langfuse cloud is no longer GDPR compliant." ([source](https://news.ycombinator.com/item?id=46659028)) "Very sad, for all their marketing around EU, GDPR, privacy and so on." ([source](https://news.ycombinator.com/item?id=46659303)) "Will be moving away immediately for this reason." ([source](https://news.ycombinator.com/item?id=46659277))
- Complex setup and feature-heavy (2 comments): "Tools like Langfuse exist, but they aren't designed for game loops and require complex observability setups." ([source](https://news.ycombinator.com/item?id=49009644)) "Langfuse is great but tends to be more feature-heavy" ([source](https://news.ycombinator.com/item?id=47256536))
- Stops at tracing, lacks cost rollups (2 comments): "they tell 'which' agent failed, but my tool (Argus) tells 'why' that agent failed." ([source](https://news.ycombinator.com/item?id=49701608)) "they show traces but don't roll up to "feature X costs $0.12/invocation."" ([source](https://news.ycombinator.com/item?id=47395801))

## Alternatives hackers recommend

- [LangSmith](https://hackerapproved.com/p/langsmith.md): 6 recommend
- [Laminar](https://hackerapproved.com/p/laminar.md): 5 recommend

## Cite as

Hacker Approved, "Langfuse", https://hackerapproved.com/p/langfuse/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).