AI Governance Safety & Evaluation Freemium

Langtrace

Open-source OpenTelemetry observability and evaluation for LLM applications

Visit official website
PricingFreemium
Starting price$39/user/mo
Free planYes
Free trialYes
APIYes
Open sourceYes
DeploymentHybrid
Last verifiedAugust 2, 2026
Overview

Tool overview

Langtrace is listed under AI Governance Safety & Evaluation AI tools.

Summary

What is Langtrace?

Langtrace is an open-source observability platform for LLM applications. Its Python and TypeScript SDKs emit OpenTelemetry traces to Langtrace or other backends, while the web dashboard supports usage, cost, latency, success-rate, accuracy, evaluations, prompts, datasets, and annotations.

Best fit

Best for

Developers needing open LLM traces, evaluations, and cost visibility

Audience

Who is it for?

LLM application developersAI platform engineersEvaluation teamsObservability and DevOps teams
Recommendation

Decision note

Accepted for Preview after independent V411 official-source research. Apply only after failures = 0, warnings = 0, unmapped = 0, and all proposed changes are reviewed.

Capabilities

Key features

OpenTelemetry-based LLM traces

Usage, cost, latency, and success-rate analysis

Prompt management, datasets, and evaluations

Hosted dashboard or self-hosted deployment

Workflows

Use cases

Trace production LLM applications

Analyze token cost and latency

Evaluate prompts and model outputs

Export telemetry to existing observability stacks

Strengths

Pros

  • Open-source application and SDKs
  • OpenTelemetry avoids backend lock-in
  • Free hosted tier and self-hosting option
Considerations

Limitations

Evaluation accuracy depends on chosen criteria and datasets

Self-hosting requires operating the dashboard and storage stack

Cost

Pricing details

Pricing modelFreemium
Starting price$39/user/mo
Free planYes
Free trialYes
Pricing context

Billing options

FreeMonthly per userUsage-based overageCustom enterprise
Pricing context

Pricing note

Starter is free forever for one user and up to 10,000 spans per month. Growth costs $39 per user per month and includes 50,000 spans before a $0.005 charge for each additional span. Scale pricing is custom.

View official pricing
Compatibility

Supported languages

  • English
Connectivity

Integrations

OpenAI

Anthropic

LangChain

OpenTelemetry exporters

Specs

Technical details

PlatformsWeb, API
Multilingual supportYes
Login requiredYes
Open sourceYes
LicenseAGPL-3.0
DeploymentHybrid
CompanyScale3 Labs
Models / versionsPython SDK TypeScript SDK
Editions / plansStarter Growth Scale
Data confidenceHigh
Last verifiedAugust 2, 2026
Documentation → Source code → Release notes → Data source →
Decision hub

Finish your evaluation of Langtrace

Move between similar tools, comparison cards, quick answers, user reviews, and open discussion without leaving the page.

Tools, comparisons & answers

Explore the best next step before choosing Langtrace

Browse similar tools, open focused comparison cards, and answer the most common buying questions.

Similar tools Comparisons FAQ
Compare

Compare alternatives

See how Langtrace compares with the closest relevant AI tools.

Build custom comparison
Smart AI comparison Langtrace vs F5 AI Guardrails Compare pricing, ratings, features, AI score, and use cases. Enterprise only alternative View comparison Smart AI comparison Langtrace vs Superagent Compare pricing, ratings, features, AI score, and use cases. Freemium alternative View comparison Smart AI comparison Langtrace vs TrustAI Compare pricing, ratings, features, AI score, and use cases. Unknown alternative View comparison Smart AI comparison Langtrace vs Traceloop Compare pricing, ratings, features, AI score, and use cases. Freemium alternative View comparison
Answers

Frequently asked questions

Langtrace is an open-source observability platform for LLM applications. Its Python and TypeScript SDKs emit OpenTelemetry traces to Langtrace or other backends, while the web dashboard supports usage, cost, latency, success-rate, accuracy, evaluations, prompts, datasets, and annotations.
Developers needing open LLM traces, evaluations, and cost visibility
The listed pricing model for Langtrace is freemium. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
Community proof

User reviews

Real user feedback helps others understand strengths, limitations, and the best-fit workflows before choosing this tool.

No reviews Average rating
0 Total reviews
No reviews yet

Be the first to review Langtrace

Share what worked, what did not, who this AI tool is best for, and what buyers should verify before choosing it.

Ask in discussion
Tool discussion

Ask or discuss this tool

Ask questions, share workflows, or discuss your experience with this AI tool.

ReplyContinue threads
EditUpdate your posts
ReportKeep it useful
0Total messages
0Threads
0Replies
Start a useful threadAsk, compare workflows, or reply to reviews

Keep it specific and helpful. You can edit or delete your own messages after posting.

Please log in to join the discussion.

Live discussion

Community messages

Reply to messages and keep the discussion useful. Use Report for abuse or spam. Your own posts can be edited or deleted.

No discussion yetBe the first to ask a question or share a useful workflow.