AI agents
langflow
Build AI workflows by wiring components together visually
★ 154k
September 2026
MIT
AI agents
What we checked ourselves
Not copied from the project's own blurb. These are things we opened and verified, with the date.
- 7 Sept 2026We checked that the link to the project still resolves.
- 13 Sept 2026We read the licence text itself (LICENSE). No unusual restrictions were stated.
- 31 Aug 2026We read the project's own documentation and found no sign that development has stopped.
Where this sits among the 114 tools we list in AI agents
- Commercial use confirmed as allowed95 of 114
- Requires terminal commands21 that do not →
- Requires an API key29 that do not →
- Sends your input to the provider11 that do not →
Counted from our own checks: every tool we list is examined against the same criteria.
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.
| Tool | Command line | API key | Sends data out | Phone | Commercial use |
|---|---|---|---|---|---|
| langflow (this page) | Required | Required | Yes | No | Yes |
| LangGraph | Required | Required | Yes | No | Yes |
| sim | Required | Required | Yes | No | Yes |
| pyspur | Required | Required | Yes | No | Yes |
"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.