langflow

What it does

Compose what an AI should do by connecting blocks on a canvas, then expose the finished flow as an API or MCP server so it can be called from your own application. It ships with connectors for the major LLMs, vector databases and a growing set of tools. The canvas is visual, but getting there is not: you need Python 3.10-3.14 and the command line to install and start it, and you pay for the model calls yourself. MIT licensed.

Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.

Screenshots & visuals

Before you start

• Setup difficultySome setup needed
• Command lineRequired
• API keyRequired
• Sends data onlineYes

Judged automatically from the project's own metadata. Always confirm on the official page.

langflow FAQ

Is langflow free?

langflow itself is free, but it needs an API key for an external AI service. That service charges separately, though some have a free tier.

Do I need to install anything or write code to use langflow?

It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.

Does langflow work on a phone?

No. It needs a computer.

Can I use langflow commercially?

The licence is MIT, which permits commercial use. Conditions such as keeping the copyright notice still apply, so read the licence text before shipping it inside something.

How it compares

The conditions that decide whether you can actually use it, side by side.

"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.

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