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

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

vs

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

# LangSmith vs OpenTelemetry: Which is Better in 2026?

LLM Observability & Evals

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

## LangSmith vs OpenTelemetry — Side by Side

|                | LangSmith                                      | OpenTelemetry                                      |
| -------------- | ---------------------------------------------- | -------------------------------------------------- |
| Category       | LLM Observability & Evals                      | LLM Observability & Evals                          |
| Pricing        | Free · paid from $39/seat/mo                   | Free                                               |
| Starting price | Free tier available                            | Free tier available                                |
| Free tier      | ✓                                              | ✓                                                  |
| Rating         | 4.5                                            | 4.6                                                |
| Best for       | LLM Observability & Evals — llm, observability | LLM Observability & Evals — observability, tracing |

## Pros & Cons

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

[LangSmith](https://appstackbuilder.com/tools/langsmith)

* ✓Best-in-class visibility into LangGraph and LangChain agents
* ✓Mature evals, datasets and annotation queues
* ✓Accepts OpenTelemetry traces from non-LangChain code
* ✗Per-seat and per-trace pricing both scale with you
* ✗Trace pricing has changed repeatedly, so budgets drift
* ✗Self-hosting requires an Enterprise contract

![](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

### LangSmith

* ✓10,000 base traces / month included
* ✓Pay as you go beyond that
* ✓Unlimited seats
* ✓Extended 180-day retention available

### 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 LangSmith if…

* ✓You want a free tier to validate before paying.
* ✓Best-in-class visibility into LangGraph and LangChain agents
* ✓Mature evals, datasets and annotation queues
* ✓Accepts OpenTelemetry traces from non-LangChain code
[LangSmith review & pricing ](https://appstackbuilder.com/tools/langsmith)

### 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 LangSmith better than OpenTelemetry?⌄

Both LangSmith 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 LangSmith and OpenTelemetry?⌄

LangSmith — LangChain's tracing and evaluation platform, the deepest fit for LangGraph agents. It is priced per seat plus per trace. 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.

LangSmith vs OpenTelemetry: which is cheaper?⌄

LangSmith pricing: Free · paid from $39/seat/mo. OpenTelemetry pricing: Free. Confirm current pricing on each tool's official site, as plans change.

Which is rated higher, LangSmith or OpenTelemetry?⌄

In our catalog, LangSmith rates 4.5 out of 5 and OpenTelemetry rates 4.6 out of 5, so OpenTelemetry 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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