Langfuse
8.2#1 in prompting toolFrom $29 a monthFree planWebAPILinuxSelf-hosted
VisitLangfuse vs W&B Weave
What both publish
| Fact | Langfuse | W&B Weave |
|---|---|---|
| Acquisition news | ClickHouse announced on January 16, 2026 that it had acquired Langfuse alongside a $400 million Series D financing. | CoreWeave announced on 4 March 2025 that it would acquire Weights & Biases and completed the acquisition on 5 May 2025. |
| Encryption | Langfuse Cloud protects traffic with TLS 1.2+ and stored data with AES-256 encryption. | W&B states that data is encrypted in transit using TLS 1.2+ and at rest using AES 256. |
| Evaluations | Evaluation supports LLM-as-a-Judge, heuristic or code evaluators, human review, annotation queues, and scoring of production data or experiments. | An imperative evaluation API compares application or model changes with visualizations intended to expose regressions. |
| Headquarters | Berlin, Germany; San Francisco, United States | San Francisco, California, United States |
| Integrations | Langfuse lists more than 100 integrations spanning OpenTelemetry, Python and TypeScript, model providers, agent frameworks, gateways, and developer tools. | The deployment guide lists integrations for OpenAI, Anthropic, Cohere, Mistral, LangChain, LlamaIndex, DSPy, Google Gemini, Amazon Bedrock, Together and Groq. |
| 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. | The public Weave repository is released under the Apache-2.0 license. |
| Rating on G2 | 4.5 out of 5 from 1 review | 4.5 out of 5 from 83 reviews |
| Rating on Gartner Peer Insights | 4.6 out of 5 from 5 ratings | 5.0 out of 5 from 1 review |
| Rating on TrustRadius | No rating or review count displayed on the Langfuse profile | 10 out of 10 from 2 reviews |
| 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. | W&B describes AWS, Azure and Google Cloud hosting and says Trust Center certifications and security artifacts are available to approved customers. |
Langfuse plans
- HobbyFree
- Core$29 a month
- Pro$199 a month
- Teams Add-on$300 a month
- Enterprise$2,499 a month
W&B Weave plans
- FreeFree
- Pro$60 a month
- EnterprisePriced on request
Pick Langfuse if…
Langfuse suits teams building AI agent applications that need tracing, prompt management, and evaluation tools. It also supports teams that want to self-host the core on their own infrastructure.
Pick W&B Weave if…
Weave suits teams developing and monitoring production AI agents that need tracing, evaluations, and model or prompt comparisons. It also fits teams that use Python or TypeScript libraries or send OpenTelemetry traces.