---
title: "Langfuse vs OpenTelemetry: Which is Better in 2026? | App Stack Builder"
description: "Langfuse vs OpenTelemetry 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/langfuse-vs-opentelemetry
retrieved: 2026-10-07
---

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

vs

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

# Langfuse vs OpenTelemetry: Which is Better in 2026?

LLM Observability & Evals

Choosing between [Langfuse](https://appstackbuilder.com/tools/langfuse) and [OpenTelemetry](https://appstackbuilder.com/tools/opentelemetry)? 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 Langfuse and OpenTelemetry are strong llm observability & evals choices. The right pick comes down to your specific feature needs, existing stack, and team preferences.

## Langfuse vs OpenTelemetry — Side by Side

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

## Pros & Cons

![](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

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

[OpenTelemetry](https://appstackbuilder.com/tools/opentelemetry)

* ✓No vendor lock-in: switch backends without re-instrumenting
* ✓One trace spans your API, database and model calls
* ✓Every serious observability vendor accepts OTLP
* ✓Apache 2.0 licensed, CNCF governed
* ✗No UI, evals or prompt management of its own
* ✗You still have to pick and pay for (or run) a backend
* ✗GenAI conventions are still evolving, so attribute names can shift

## Key Features Compared

### Langfuse

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

### OpenTelemetry

* ✓SDKs for every major language
* ✓OpenTelemetry Collector for routing and sampling
* ✓GenAI semantic conventions for LLM, agent and MCP spans
* ✓Export to any OTLP-compatible backend

### Choose Langfuse if…

* ✓You want a free tier to validate before paying.
* ✓Genuinely open source and self-hostable
* ✓Unit pricing does not punish adding teammates
* ✓Framework-agnostic: OpenTelemetry, LangChain, LlamaIndex, raw SDKs
[Langfuse review & pricing ](https://appstackbuilder.com/tools/langfuse)

### Choose OpenTelemetry if…

* ✓You want a free tier to validate before paying.
* ✓No vendor lock-in: switch backends without re-instrumenting
* ✓One trace spans your API, database and model calls
* ✓Every serious observability vendor accepts OTLP
[OpenTelemetry review & pricing ](https://appstackbuilder.com/tools/opentelemetry)

## Frequently Asked Questions

Is Langfuse better than OpenTelemetry?⌄

Both Langfuse and OpenTelemetry are strong llm observability & evals choices. The right pick comes down to your specific feature needs, existing stack, and team preferences.

What is the difference between Langfuse and OpenTelemetry?⌄

Langfuse — Open-source LLM tracing, evals and prompt management: MIT-licensed, self-hostable, and $29/month in the cloud with unlimited users. OpenTelemetry — The vendor-neutral standard for traces, metrics and logs, with GenAI conventions that describe LLM calls, agents and MCP in one shared schema. Both are llm observability & evals tools; the comparison table above breaks down pricing, free tiers, and what each is best for.

Langfuse vs OpenTelemetry: which is cheaper?⌄

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

Which is rated higher, Langfuse or OpenTelemetry?⌄

In our catalog, Langfuse rates 4.7 out of 5 and OpenTelemetry rates 4.6 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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