Langflow

Open source alternative to Relevance AI and Stack AI

155.9K stars
MIT
Active this week
Last commit today

Last verified Oct 22, 2026

Build AI agents and workflows with a visual interface; deploy each as an API or MCP server. MIT licensed, self-hosted on Docker or desktop.

Visit website GitHub155.9K Deploy on Hostinger

Read the full breakdownWho it is for, how it works, trade-offs, the quick start and the FAQ

who it's for

Who Langflow is for#

Python developers building production AI agents

Langflow's combination of visual prototyping and Python-first customization fits developers who want to compose an agent quickly on the canvas, verify it in the playground, and expose it as a REST API to a production application. The per-component Python access means advanced logic never requires leaving the tool.

Skip if:

Teams working entirely in a non-Python stack may find the Python-centric component model awkward; a framework with native language bindings for their stack will likely fit better.

Teams migrating off managed LLMOps platforms

Organizations running workflows on Relevance AI or Stack AI who want to stop paying per-execution fees can move flows to self-hosted Langflow and keep a visual authoring experience. The MCP server export enables integrating migrated flows into existing toolchains without a rewrite.

Skip if:

Teams with no server infrastructure who want zero operational overhead should compare the total cost of running Langflow against the subscription cost of their current managed platform before migrating.

Developers prototyping chatbots and RAG pipelines

The interactive playground lets you test retrieval-augmented generation configurations with per-step node visibility, making it faster to tune retrieval parameters without writing test scripts. Conversation memory and multi-turn support are built into the component library.

Skip if:

Simple single-prompt chatbots that do not require retrieval, multi-step logic, or agent memory are better served by a direct SDK call; the visual builder adds overhead not justified for straightforward completions.

AI platform teams building internal tools

Teams building internal AI tools for non-technical users can expose Langflow workflows as API endpoints, hiding agent complexity behind a clean API surface. The MCP server export turns any flow into a tool that other AI systems can call programmatically.

Skip if:

If the final product needs a fully branded end-user-facing UI, Langflow's built-in chat interface may not fit; you would build the UI separately and call the Langflow API from it.

the problem

The problem it solves#

Building AI agents from scratch means wiring together LLM calls, vector database queries, tool integrations, and conversation memory, all in Python code. Each integration is a brittle contract: when an upstream API changes, the glue code breaks. Teams that start with custom scripts often end up with a tangle of Python files no one wants to modify.

The alternative is a managed LLMOps platform that abstracts the integration layer, but those services execute your workflows on their infrastructure, charge per run or per seat, and give you no way to inspect or modify how your agent actually runs. Switching later requires rewriting every flow from scratch.

how Langflow solves it

How it solves it#

Visual drag-and-drop canvas

Langflow's React-based canvas lets you connect LLM models, vector databases, memory stores, and custom tools by snapping components together. Each edge in the graph maps to a typed data connection, so mismatches surface at build time rather than at runtime.

Full Python access for every component

Every built-in component exposes its Python source, and you can add custom Python classes to the component library at any time. This means you can use the visual canvas for scaffolding and drop to code for any logic that does not fit the drag-and-drop model.

Interactive playground with step-by-step control

The built-in playground runs a flow in your browser with per-step visibility into inputs and outputs. You can freeze or replay individual nodes to isolate failures without writing test scripts.

API and MCP server export

Every flow can deploy as a REST API endpoint or as an MCP server that exposes the flow as a callable tool for MCP clients. Both outputs integrate into any language or framework without additional integration code.

Multi-agent orchestration

Langflow supports orchestrating multiple agents in a single flow, with conversation history and retrieval-augmented generation built in. You can compose a planner agent, worker agents, and routing logic without custom coordination code.

Observability with LangSmith and LangFuse

LangSmith and LangFuse integrations plug into any flow. Traces, latency metrics, and token counts route to the observability backend automatically once the integration is configured, with no additional code in the flow itself.

strengths · trade-offs

Strengths and trade-offs#

Strengths

MIT license with no execution restrictionsThe full self-hosted version is MIT licensed, so teams can run it on internal infrastructure and use it commercially without execution fees or seat limits. Managed LLMOps platforms typically charge per workflow run or per API call; Langflow's self-hosted model makes high-volume agent deployments cost-predictable.
Deploys as API and MCP server without extra scaffoldingEvery Langflow workflow can publish as a REST API endpoint or an MCP server that exposes the flow as a callable tool, both built into the tool. No additional integration layer is needed to make a finished flow callable from an external application or agent.
155,000+ GitHub stars and active maintenanceOver 155,000 GitHub stars, 10,000 forks, and a last push in October 2026 confirm the project is actively maintained and widely adopted. This scale of community signals that common integration patterns and issues get attention quickly.
Desktop app for zero-dependency onboardingLangflow Desktop for Windows and macOS bundles all Python dependencies, so a developer can run the full builder without managing virtual environments or installing packages separately. This removes onboarding friction for teams new to Python tooling.

Trade-offs

-Python 3.10+ or Docker required for self-hostingThe recommended install path uses the uv package manager and Python 3.10-3.14. Teams without an existing Python environment need to set one up before running Langflow locally. The Docker path reduces this to a container runtime dependency, but still requires familiarity with Docker to operate.
-Over 1,100 open issues in the trackerThe GitHub issue tracker shows 1,151 open items at time of writing. For a project with this adoption level, many are likely feature requests or edge cases rather than critical bugs, but teams using Langflow in production should validate the specific workflows they depend on and monitor upstream releases.

versus alternatives

Langflow vs alternatives#

Langflow vs Relevance AI

Relevance AI is a managed platform for building AI agents and automations where workflow execution runs on their cloud infrastructure. Langflow is open source and self-hosted under an MIT license.

The key practical difference is the deployment model. On Relevance AI, your workflows execute inside their environment on their compute, and you have no access to inspect or modify the execution layer. On Langflow, the execution layer runs wherever you deploy it, every component is inspectable, and the Python source is available for any customization.

Langflow is the clearer choice when data residency requirements, cost at scale, or the need to modify agent runtime behavior are priorities. Relevance AI is worth considering when the team wants a managed, no-infrastructure-management setup and is willing to accept the per-execution pricing model.

Langflow vs Stack AI

Stack AI targets enterprise teams who need fast LLM pipeline deployment with minimal engineering overhead, offering a no-code interface on managed cloud infrastructure.

Langflow is better suited when your team has Python expertise, requires direct API or MCP server exports from flows, or needs cost predictability on high-volume agent workloads. Stack AI is worth considering for non-technical teams or organizations that need vendor-managed compliance and security controls rather than self-hosted infrastructure ownership.

One concrete difference is extensibility. Langflow exposes every component's Python source, so a developer can add custom logic at any level of the workflow graph. Managed no-code platforms like Stack AI typically offer only the integrations they have built and shipped.

install · quick start

Quick start#

bash

Deploy with Docker or install the Python package using uv.
```bash
docker run -p 7860:7860 langflowai/langflow:latest
```

Python install via uv:
```bash
uv pip install langflow -U
uv run langflow run
```

tech stack · detected from GitHub

What it's built on#

Languages: JavaScriptPythonTypeScript
Frameworks: ReactReact Flow
Tooling: esbuild

frequently asked

FAQ#

Is Langflow free to use?

Yes. Langflow is MIT licensed and free to self-host on your own infrastructure with no usage caps or per-run fees. Both Python and Docker install paths are supported; the README documents setup with the uv package manager as the recommended local path.

What are the system requirements for self-hosting Langflow?

The local install requires Python 3.10 through 3.14 and the uv package manager. The Docker path requires only a container runtime and runs Langflow on port 7860. For production deployments, Langflow provides guides for all major cloud providers.

Can I run Langflow without managing a Python environment?

Yes. Langflow Desktop for Windows and macOS bundles all Python dependencies into a standalone application. You download and run it without installing Python or managing virtual environments separately.

Does Langflow support multi-agent workflows?

Yes. Multi-agent orchestration with conversation management and retrieval is a named feature in the README. You can wire planner agents, worker agents, and routing logic into a single flow without custom coordination code.

How does Langflow expose workflows to external applications?

Every Langflow flow can deploy as a REST API endpoint or as an MCP server that turns the flow into a callable tool for MCP clients. Both export paths are built into the tool; no additional integration code is required after the flow is built.

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Langflow vs Relevance AI

Relevance AI is a managed platform for building AI agents and automations where workflow execution runs on their cloud infrastructure. Langflow is open source and self-hosted under an MIT license.

Langflow vs Stack AI

Stack AI targets enterprise teams who need fast LLM pipeline deployment with minimal engineering overhead, offering a no-code interface on managed cloud infrastructure.

Who Langflow is for#

Python developers building production AI agents

Skip if:

Teams migrating off managed LLMOps platforms

Skip if:

Developers prototyping chatbots and RAG pipelines

Skip if:

AI platform teams building internal tools

Skip if:

The problem it solves#

How it solves it#

Visual drag-and-drop canvas

Full Python access for every component

Interactive playground with step-by-step control

API and MCP server export

Multi-agent orchestration

Observability with LangSmith and LangFuse

Strengths and trade-offs#

Strengths

Trade-offs

Langflow vs alternatives#

Langflow vs Relevance AI

Langflow vs Stack AI

Quick start#

What it's built on#

FAQ#

Similar open-source tools#

Open source tools in these categories#

AI & Machine Learning

LLMOps & AI Tooling

Developer Tools

No-Code & Low-Code

Find open source alternatives to paid software

Who Langflow is for#

Python developers building production AI agents

Skip if:

Teams migrating off managed LLMOps platforms

Skip if:

Developers prototyping chatbots and RAG pipelines

Skip if:

AI platform teams building internal tools

Skip if:

The problem it solves#

How it solves it#

Visual drag-and-drop canvas

Full Python access for every component

Interactive playground with step-by-step control

API and MCP server export

Multi-agent orchestration

Observability with LangSmith and LangFuse

Strengths and trade-offs#

Strengths

Trade-offs

Langflow vs alternatives#

Langflow vs Relevance AI

Langflow vs Stack AI

Quick start#

What it's built on#

FAQ#

Similar open-source tools#

Open source tools in these categories#

AI & Machine Learning

LLMOps & AI Tooling

Developer Tools

No-Code & Low-Code

Find open source alternatives to paid software