Open-source-core LLM observability with tracing, evals, prompt management and playground, offered as a managed cloud.
Pricing: Cloud: Hobby $0, Core $29/mo, Pro $199/mo, Enterprise $2,499/mo; usage overage ~$8 / 100k units. Core product is MIT open-source (self-host free).
Instant self-serve — free signup gives a key immediately (a human unblocks an agent in under 2 minutes).
Cloud Hobby tier free with no credit card; project keys (pk-lf-.../sk-lf-...) are created instantly in the UI. Programmatic org/project/key provisioning (Instance-Management/Admin API) exists ONLY on self-hosted Enterprise, not on Cloud.
Langfuse Cloud — Open-source-core LLM observability with tracing, evals, prompt management and playground, offered as a managed cloud.
Website: https://langfuse.com
Docs: https://langfuse.com/docs
Get a key: https://cloud.langfuse.com
Agent signup: self serve instant key — Cloud Hobby tier free with no credit card; project keys (pk-lf-.../sk-lf-...) are created instantly in the UI. Programmatic org/project/key provisioning (Instance-Management/Admin API) exists ONLY on self-hosted Enterprise, not on Cloud.
Auth: api-key
MCP server: https://langfuse.com/docs/api-and-data-platform/features/mcp-server
Pricing: freemium — Cloud: Hobby $0, Core $29/mo, Pro $199/mo, Enterprise $2,499/mo; usage overage ~$8 / 100k units. Core product is MIT open-source (self-host free).
Full record: https://dreaming.press/api/tools/langfuse-cloud.jsonMachine record: /api/tools/langfuse-cloud.json · add its MCP server →
# env: LANGFUSE_PUBLIC_KEY=pk-lf-..., LANGFUSE_SECRET_KEY=sk-lf-..., LANGFUSE_HOST=https://cloud.langfuse.com
# drop-in OpenAI wrapper auto-traces every call
from langfuse.openai import openai
resp = openai.chat.completions.create(
model="gpt-4o",
messages=[{"role": "user", "content": "Trace this call"}],
)
print(resp.choices[0].message.content)python · full docs →
Langfuse Cloud exposes an MCP server, so you can add its tools to Claude, Cursor, or any MCP client: https://langfuse.com/docs/api-and-data-platform/features/mcp-server
Langfuse Cloud is Open-source-core LLM observability with tracing, evals, prompt management and playground, offered as a managed cloud. It's in the Observability & evals (managed) category of the dreaming.press tool directory.
Langfuse Cloud is freemium — free to start, paid plans for scale. Cloud: Hobby $0, Core $29/mo, Pro $199/mo, Enterprise $2,499/mo; usage overage ~$8 / 100k units. Core product is MIT open-source (self-host free)..
Almost — signup is instant and self-serve (a free key with no sales call), so a human can unblock an agent in under two minutes. Cloud Hobby tier free with no credit card; project keys (pk-lf-.../sk-lf-...) are created instantly in the UI. Programmatic org/project/key provisioning (Instance-Management/Admin API) exists ONLY on self-hosted Enterprise, not on Cloud..
Yes — Langfuse Cloud offers a Model Context Protocol server, so you can add its tools to Claude, Cursor, or any MCP client: https://langfuse.com/docs/api-and-data-platform/features/mcp-server
Langfuse Cloud is a hosted API service, not an open-source project.
Langfuse Cloud offers Python, TypeScript, OpenTelemetry, REST.
We track the AI stack so you don't have to — pricing, MCP support, and which tools an agent can sign up for. Free.