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About

Langfuse is an open source LLM engineering platform to help teams collaboratively debug, analyze and iterate on their LLM Applications. Observability: Instrument your app and start ingesting traces to Langfuse Langfuse UI: Inspect and debug complex logs and user sessions Prompts: Manage, version and deploy prompts from within Langfuse Analytics: Track metrics (LLM cost, latency, quality) and gain insights from dashboards & data exports Evals: Collect and calculate scores for your LLM completions Experiments: Track and test app behavior before deploying a new version Why Langfuse? - Open source - Model and framework agnostic - Built for production - Incrementally adoptable - start with a single LLM call or integration, then expand to full tracing of complex chains/agents - Use GET API to build downstream use cases and export data

About

telemetry.dev is an OpenTelemetry-native observability platform for AI agents and LLM applications. Developers can trace model calls, tool steps, retrievals, logs, and metrics; inspect failures, latency, token usage, and estimated cost; and compare activity by model, provider, and environment. It supports first-party TypeScript and Python SDKs, provider and framework integrations, and standard OTLP/HTTP ingest. Environment-level capture controls, SDK masking, and server-side redaction help teams manage stored prompt, response, and telemetry content.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Software Engineers, AI Engineers, Data Scientists, Product Managers

Audience

Developers and engineering teams building, operating, and debugging AI agents and LLM applications.

Support

Phone Support Not Supported
24/7 Live Support Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

API

Offers API Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$29/month
Generous free tier and Pro Plans starting at USD 29/month.
Langfuse is open source so you will always be able to host the software yourself at no cost.
Free Version Supported
Free Trial Supported

Pricing

$0/month
Prices are per organization per month. Free includes 30,000 ingestion units per month, 14-day retention, 1 project, and 2 seats. Pro is $25 per month with 500,000 ingestion units, 30-day retention, 5 projects, and 5 seats. Team is $50 per month with 2 million ingestion units, 90-day retention, unlimited projects and seats, and priority support. One normalized span, OTLP log record, or metric data point counts as one ingestion unit. Paid ingestion continues beyond the listed allowances without automatic overage charges; the vendor may contact consistently high-usage customers.
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 5.0 / 5
ease 4.0 / 5
features 5.0 / 5
design 4.0 / 5
support 5.0 / 5

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Pros & Cons from Real Users

Pros

  • I like that this is exclusively designed for LLMs only, so it takes a lot of clutter out of having to deal with features to do with rest of the models. Scores are very comprehensive including the ones related to query/response, ability to find rag relevance, cost related metrics which other tools typically do not offer and comprehensive trace function.

Cons

  • There wasn't much but if I have to highlight something here, self hosting was difficult. And the main dashboard can have drill downs to take it to relevant sections in traces/generations etc

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Langfuse
Founded: 2023
Germany
langfuse.com

Company Information

telemetry.dev
telemetry.dev/

Alternatives

Alternatives

Arize Phoenix

Arize Phoenix

Arize AI
Grafana Cloud

Grafana Cloud

Grafana Labs

Categories

AI Observability Supported
LLM Evaluation Supported
Observability Supported
Prompt Management Supported

Categories

Integrations

LangChain Supported
LiteLLM Supported
OpenAI Supported
Amazon Bedrock Not Supported
Anthropic Not Supported
Claude Code Not Supported
CrewAI Not Supported
Flowise Supported
Lamatic.ai Supported
LlamaIndex Supported
Model Context Protocol (MCP) Not Supported
Netguru Omega Supported
OpenCode Not Supported
OpenRouter Not Supported
OpenTelemetry Not Supported
PydanticAI Not Supported
TierZero Supported
Vercel AI SDK Not Supported
Voker Supported
Workers by Delos Supported

Integrations

LangChain Supported
LiteLLM Supported
OpenAI Supported
Amazon Bedrock Supported
Anthropic Supported
Claude Code Supported
CrewAI Supported
Flowise Not Supported
Lamatic.ai Not Supported
LlamaIndex Not Supported
Model Context Protocol (MCP) Supported
Netguru Omega Not Supported
OpenCode Supported
OpenRouter Supported
OpenTelemetry Supported
PydanticAI Supported
TierZero Not Supported
Vercel AI SDK Supported
Voker Not Supported
Workers by Delos Not Supported
Claim Langfuse and update features and information
Claim Langfuse and update features and information
Claim telemetry.dev and update features and information
Claim telemetry.dev and update features and information