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Langfuse

langfuse.com

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Spec score 9.3 #1 of 25 in Prompting Tool

What it is

Langfuse is an open-source AI engineering platform for teams debugging, analyzing, and iterating on AI agent applications. Its tracing records prompts, model responses, token use, latency, tool calls, retrieval steps, and metadata. Prompt Management stores, versions, deploys, and tests prompts, then links them to traces. Evaluation features include LLM-as-a-judge, code evaluators, user feedback, manual labeling, datasets, and experiments. Integrations include Python and JS/TS SDKs, OpenTelemetry, an API, CLI, MCP Server, and popular AI frameworks. Teams can self-host the MIT-licensed core on customer infrastructure using Docker, with options including Docker Compose, Kubernetes, AWS, and Azure. Langfuse reports annual SOC 2 Type 2 and ISO 27001 audits, external penetration tests, GDPR compliance, a DPA, and a HIPAA-ready region. Its Cloud traffic uses TLS 1.2+ and stored data uses AES-256 encryption. The free Hobby plan is free and includes 50k units per month, 30 days of data access, two users, and community support via GitHub. Core costs $29 a month, billed monthly.

Spec sheet

What it does
Langfuse is an open-source AI engineering platform for tracing, prompt management, evaluations, metrics, and iterative improvement of LLM applications and agents.Read 15 Oct 2026 · langfuse.com
Product
Langfuse is an open-source AI engineering platform that helps teams collaboratively debug, analyze, and iterate on AI agent applications.Read 30 Sep 2026 · langfuse.com
API
The public data platform includes APIs for observations, experiments, metrics, prompts, datasets, projects, exports, and an OpenAPI specification.Read 15 Oct 2026 · langfuse.com
Integrations
Langfuse lists more than 100 integrations spanning OpenTelemetry, Python and TypeScript, model providers, agent frameworks, gateways, and developer tools.Read 15 Oct 2026 · langfuse.com
Security
Langfuse reports annual SOC 2 Type II and ISO 27001 audits, external penetration tests, encryption, access controls, GDPR compliance, and a HIPAA-ready region.Read 15 Oct 2026 · langfuse.com
Support
Hobby includes community support via GitHub, Core includes in-app support, Pro includes prioritized in-app support, and Enterprise includes support SLA and a named lead support engineer.Read 30 Sep 2026 · langfuse.com
Headquarters
Berlin, Germany; San Francisco, United StatesRead 23 Sep 2026 · langfuse.com
Access control
Langfuse supports role-based access control and enterprise single sign-on through OIDC.Read 30 Sep 2026 · langfuse.com
Acquisition news
ClickHouse announced on January 16, 2026 that it had acquired Langfuse alongside a $400 million Series D financing.Read 15 Oct 2026 · clickhouse.com
Cloud regions
Langfuse Cloud lists US/HIPAA hosting in AWS us-west-2, EU hosting in eu-west-1, and Japan hosting in ap-northeast-1.Read 15 Oct 2026 · langfuse.com
Company legal identity
The legal entity is Langfuse GmbH, registered in Berlin, Germany, with an address on Oranienburgerstraße 91.Read 15 Oct 2026 · langfuse.com
Company locations and size
LinkedIn lists Langfuse as privately held, headquartered in San Francisco, founded in 2022, with 11–50 employees and an additional Berlin location.Read 15 Oct 2026 · linkedin.com
Company status
Langfuse joined ClickHouse in January 2026.Read 30 Sep 2026 · langfuse.com
Documentation
Documentation covers observability, prompt management, evaluation, metrics, APIs, SDKs, integrations, compatibility, deployment, and security with versioned self-hosting guides.Read 15 Oct 2026 · langfuse.com
Encryption
Langfuse Cloud protects traffic with TLS 1.2+ and stored data with AES-256 encryption.Read 30 Sep 2026 · langfuse.com
Evaluation
Evaluation features include LLM-as-a-judge, code evaluators, user feedback, manual labeling, datasets, and experiments.Read 30 Sep 2026 · langfuse.com
Evaluations
Evaluation supports LLM-as-a-Judge, heuristic or code evaluators, human review, annotation queues, and scoring of production data or experiments.Read 15 Oct 2026 · langfuse.com
Experiments
The UI can run prompt or model experiments over datasets and compare results side by side, optionally applying evaluators.Read 15 Oct 2026 · langfuse.com
Extensibility
Langfuse provides a CLI, MCP server, agent skill, REST APIs, query SDKs, and blob-storage exports for scripts, CI/CD, and coding-agent workflows.Read 15 Oct 2026 · langfuse.com
Founded and accelerator
Y Combinator says Langfuse began during its W23 batch in San Francisco while GPT-4 was initially released.Read 15 Oct 2026 · ycombinator.com
Funding
Crunchbase lists one seed funding round with five investors, including Y Combinator, La Famiglia, and Lightspeed Venture Partners, but hides the total amount.Read 15 Oct 2026 · crunchbase.com
Licence
Langfuse states that all product features are MIT licensed, while a separate Enterprise license covers governance features such as project RBAC, audit logs, SCIM, and retention policies.Read 15 Oct 2026 · langfuse.com
Limit: G2 performance
The sole G2 reviewer reported that the product had recently become laggy and data sometimes failed to load.Read 15 Oct 2026 · g2.com
Limit: Gartner scale and polish
A Gartner reviewer said bulk queries can remain slow and that some workflows feel less polished as complexity and traffic increase.Read 15 Oct 2026 · gartner.com
Limit: independent practitioner reviews
Enterprise DNA characterized Langfuse as engineer-oriented, requiring infrastructure capability and still having gaps in evaluation depth, UI polish, and compliance coverage.Read 15 Oct 2026 · enterprisedna.co
Limit: self-hosting complexity
Panoply said current self-hosting requires Postgres, ClickHouse, Redis, and S3, and reported slower UI behavior on heavy traces.Read 15 Oct 2026 · panoply.io
Metrics
Metrics cover quality, cost, latency, and volume, with breakdowns by user, session, geography, feature, model, and prompt version.Read 15 Oct 2026 · langfuse.com
Notable product news
Langfuse's June 19, 2026 changelog entry added threshold monitors for cost, quality, and latency with Slack, webhook, and GitHub Actions notifications.Read 15 Oct 2026 · langfuse.com
Observability
Hierarchical traces capture LLM calls, tool invocations, and retrieval steps, with filtering by user, session, cost, latency, and metadata.Read 15 Oct 2026 · langfuse.com
Open source license
The core of Langfuse is MIT-licensed and available for self-hosting.Read 30 Sep 2026 · langfuse.com
Praise: G2 prompt management
The sole G2 reviewer praised prompt management, version tracking, and prompt testing.Read 15 Oct 2026 · g2.com
Praise: Gartner tracing and integration
Gartner reviewers repeatedly praised trace visualization for debugging multi-step pipelines, cleaner prompt versioning, straightforward FastAPI SDK setup, and self-hosting flexibility.Read 15 Oct 2026 · gartner.com
Praise: independent practitioner reviews
Enterprise DNA reported that tracing is strong, prompt management replaces substantial manual engineering work, and cost tracking reveals operational insights.Read 15 Oct 2026 · enterprisedna.co
Prompt management
Prompt Management provides versioning, one-click deployments, rollbacks, prompt labels, and per-version performance metrics.Read 15 Oct 2026 · langfuse.com
Rating on Capterra
0.0 out of 5 from 0 reviewsRead 15 Oct 2026 · capterra.com
Rating on G2
4.5 out of 5 from 1 reviewRead 15 Oct 2026 · g2.com
Rating on Gartner Peer Insights
4.6 out of 5 from 5 ratingsRead 15 Oct 2026 · gartner.com
Rating on GetApp
0 out of 5 from 0 reviewsRead 15 Oct 2026 · getapp.com
Rating on TrustRadius
No rating or review count displayed on the Langfuse profileRead 15 Oct 2026 · trustradius.com
SDKs
Official SDKs are Python v5 and JavaScript/TypeScript v6; other languages can use OpenTelemetry instrumentation.Read 15 Oct 2026 · langfuse.com
Security compliance
Langfuse reports annual SOC 2 Type 2 and ISO 27001 audits, external penetration tests, GDPR compliance, a DPA, and a HIPAA-ready region.Read 30 Sep 2026 · langfuse.com
Self-hosting
The OSS edition can be deployed with Docker Compose, Kubernetes Helm, or Terraform guides for AWS, GCP, and Azure, including offline or air-gapped installations.Read 15 Oct 2026 · langfuse.com
System requirements
The Kubernetes deployment guide requires Kubernetes 1.28 or newer, Helm 3.17 or newer, ClickHouse 25.12 minimum, Postgres 16 recommended, and Redis 7.2 recommended.Read 15 Oct 2026 · langfuse.com

Plans and prices

Hobby Free 50k units / month included · 30 days data access · 2 users · Community support via GitHub Read 30 Sep 2026 · langfuse.com
Hobby Free Free 50k units/month · 30 days data access · 2 users · community support Read 15 Oct 2026 · langfuse.com
Core $29 a month $29/ month 100k units/month included · $8/100k additional · 90 days data access · unlimited users · in-app support Read 15 Oct 2026 · langfuse.com
Core $29 a month monthly 100k units / month included · additional $8/100k units · 90 days data access · Unlimited users · In-app support Read 30 Sep 2026 · langfuse.com
Pro $199 a month $199/ month 100k units/month included · $8/100k additional · 3 years data access · data retention management · unlimited annotation queues · high rate limits · SOC2 & ISO27001 reports · HIPAA-ready region Read 15 Oct 2026 · langfuse.com
Pro $199 a month monthly 100k units / month included · additional $8/100k units · 3 years data access · Unlimited annotation queues · High rate limits · Prioritized in-app support Read 30 Sep 2026 · langfuse.com
Teams Add-on $300 a month monthly Enterprise SSO · SSO enforcement · Fine-grained RBAC · Dedicated Slack / MS Teams Channel support Read 30 Sep 2026 · langfuse.com
Teams Add-on $300 a month $300/mo Enterprise SSO · SSO enforcement · fine-grained RBAC · dedicated Slack or MS Teams support channel Read 15 Oct 2026 · langfuse.com
Enterprise $2,499 a month monthly 100k units / month included · additional $8/100k units · Audit Logs · SCIM API · Custom rate limits · Uptime SLA · Support SLA · Named lead support engineer Read 30 Sep 2026 · langfuse.com
Enterprise $2,499 a month $2499/ month Everything in Pro and Teams · audit logs · SCIM API · custom rate limits · uptime SLA · support SLA · named lead support engineer Read 15 Oct 2026 · langfuse.com

Every Langfuse plan and price →

Strong points and limits

Strong points

  • Traces prompts, token use, latency, tools, and retrieval.
  • Prompt tools link versions and tests to traces.
  • Evaluation includes datasets, experiments, and manual labeling.
  • MIT-licensed core can be self-hosted.
  • Free Hobby plan includes 50k units per month.

Limits

  • Hobby includes only 30 days of data access.
  • Hobby is limited to two users.
  • Core costs $29 a month, billed monthly.

Who it suits

Langfuse suits teams building AI agent applications that need tracing, prompt management, and evaluation tools. It offers both a hosted product and self-hosting options for teams using customer infrastructure.

Verdict

Langfuse combines tracing with prompt and evaluation workflows, and gives teams a self-hosting option. The free plan has stated limits on data access and users; Core is a paid monthly plan.

Where Specifiction places it

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