Langflow
Verified Oct 15, 2026 ActiveOpen-source visual builder for LLM agents and RAG flows, deployable as an HTTP API or an MCP server.
Listed on EffectHub ·
Pricing
- Pricing model
- 100% Free
No price list on the site. The project is MIT-licensed and free to self-host, a free cloud account is offered, and the desktop app is a free download behind a signup form; professional services and premier support go through a contact form.
Use tool ↗About Langflow
Langflow is a drag-and-drop canvas for wiring language models, vector stores, tools and data sources into agents and retrieval pipelines, where each finished flow can be exposed as an HTTP API or an MCP server. Components drop down into Python when the visual layer runs out, and a playground runs a flow interactively while you are still building it. It ships MIT-licensed on GitHub with roughly 154,000 stars, installs with pip or Docker on any Python 3.10–3.14 host, and also comes as a desktop app for Mac and Windows behind a short signup form. There is no pricing page: the project is free, and paid work is routed to a contact form for professional services and premier support.
- API
- Yes
- Last verified
- Oct 15, 2026
Verified sources
- Home page: 'Get Started for Free', flow as an API, free cloud account, same Langflow in OSS and cloud, no pricing page or price shown (15 October 2026)langflow.org ↗
- GitHub: MIT licence, about 155,700 stars, latest release v1.12.6 on 13 October 2026, pushed the same day as this check (15 October 2026)github.com ↗
Is Langflow legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- Domain registered
- Jun 6, 2023 (3 years ago)Registry record (RDAP), registrar CSC Corporate Domains, Inc., looked up Sep 6, 2026
- TLS certificate
- Issued by Let's Encrypt, valid until Dec 6, 2026Seen in our own connection to the site on Oct 15, 2026
- Last checked
- Oct 15, 2026The site answered
- Operated by
- LangflowOur research, card verified Oct 15, 2026
Pros & cons of Langflow
Langflow is the visual layer most teams reach for when a flow needs to be shown to someone who does not write Python, and the escape hatch into real code keeps it from becoming a toy. Deploying a flow as an API or MCP server in one step is the feature that earns it a place in production. The gap is commercial: no published pricing, no named vendor on the site, and support only via a contact form.
Pros
- MIT-licensed with roughly 154,000 GitHub stars and an active release cadence
- Any flow deploys as an HTTP API or an MCP server
- Runs identically self-hosted, in the free cloud, or as a desktop app
- Components can be edited as Python when the visual layer runs out
Cons
- No pricing or support tiers published anywhere on the site
- Desktop download requires a signup form and covers only Mac and Windows
- The site names no operating company or jurisdiction
- Visual flows get hard to reason about once they grow past a screen
Best for
- teams prototyping RAG and agent flows visually before coding them
- self-hosters who want an MIT-licensed orchestration layer
- exposing a flow to other tools as an MCP server
Not for
- buyers who need published support tiers and an SLA
- very simple single-prompt applications that need no orchestration
Watch out: The free cloud and the OSS build are the same product, but capacity and retention on the hosted tier are not documented — check before putting a production flow there.
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