# Langflow

**Canonical:** https://apis.io/providers/langflow/  
**Website:** https://www.langflow.org  
**APIs profiled:** 15

Langflow is an open-source low-code visual builder for AI agents, RAG pipelines, and LangChain-based workflows. It pairs a drag-and-drop React Flow frontend with a FastAPI backend that exposes every flow as a REST API, an MCP server, and an OpenAI-compatible Responses endpoint. Components are editable Python and ship with integrations across most major LLMs, vector stores, and observability platforms. Langflow was acquired by DataStax in 2025; DataStax itself was acquired by IBM and the deal closed on May 28, 2025, making Langflow an IBM property while remaining MIT-licensed open source. The project is the canonical reference implementation for visually composing LangChain agents — 149k+ GitHub stars, distributed via PyPI, Docker, Helm, and native Desktop apps, with a hosted cloud option run by DataStax.

## Kin Score — 37.1 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 37.1).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 61.1 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 21.1 |
| Developer Ergonomics | 57.1 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

## Agent readiness — 36.5 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | documented |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | documented |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (15)

- **Langflow Base API** — The Base API from Langflow — 6 operation(s) for base.
- **Langflow Chat API** — The Chat API from Langflow — 6 operation(s) for chat.
- **Langflow Files API** — The Files API from Langflow — 11 operation(s) for files.
- **Langflow Flow Events API** — The Flow Events API from Langflow — 1 operation(s) for flow events.
- **Langflow Flows API** — The Flows API from Langflow — 8 operation(s) for flows.
- **Langflow Health Check API** — The Health Check API from Langflow — 2 operation(s) for health check.
- **Langflow Log API** — The Log API from Langflow — 2 operation(s) for log.
- **Langflow MCP API** — The MCP API from Langflow — 2 operation(s) for mcp.
- **Langflow mcp_projects API** — The mcp_projects API from Langflow — 4 operation(s) for mcp_projects.
- **Langflow Monitor API** — The Monitor API from Langflow — 12 operation(s) for monitor.
- **Langflow OpenAI Responses API API** — The OpenAI Responses API API from Langflow — 1 operation(s) for openai responses api.
- **Langflow Projects API** — The Projects API from Langflow — 4 operation(s) for projects.
- **Langflow Traces API** — The Traces API from Langflow — 2 operation(s) for traces.
- **Langflow Users API** — The Users API from Langflow — 4 operation(s) for users.
- **Langflow Workflow API** — The Workflow API from Langflow — 2 operation(s) for workflow.

## Agentic access (1)

- **Langflow Agentic Access** — 95 operations · 53 acting · 2 human-in-the-loop

## Security (2)

- **Langflow Authentication** — apiKey/oauth2 · 3 schemes
- **Langflow Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Artificial Intelligence, Agents, Workflows, Low-Code, Visual Builder, LangChain, RAG, MCP, Open-Source, FastAPI

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/langflow/). Scores are computed from the provider's own public artifacts under a published rubric.