Langflow vs Sim

Langflow

• Developers prototyping agent and RAG applications on a canvas
• Teams that want to self-host an MIT-licensed builder
• Turning flows into API endpoints or MCP tools for other applications

Sim

• Teams building internal agents that share knowledge bases, tables and logs
• Developers who want a visual builder plus an API and a CLI
• Organizations that need to self-host an open-source agent platform

Langflow

• The docs cover only self-managed installs: Desktop, Docker, the Python package or Kubernetes. The homepage mentions a free cloud account but links no sign-up.
• Langflow Desktop is for macOS 13 or later and Windows, and lacks some features such as the Shareable Playground and Voice Mode.
• On Intel Macs, the ML and AI components that depend on PyTorch are limited or unavailable.
• The team gives no individual support by email: help comes through GitHub and community channels unless you subscribe to IBM Elite Support.

Sim

• The Free plan's 1,000 credits are a one-time grant with no weekly refresh, and it allows 1 workspace and no teammates.
• Every workflow run carries a base charge of 1 credit, even when you bring your own model keys.
• Sim Mailer, KB Live Sync, sandboxes and Slack Connect start at Max; access control and SSO are Enterprise only.
• The desktop app is for macOS only (macOS 12 or later); on other systems Sim is used in a browser.

Langflow

Visual flow editor

A flow is built by dragging component nodes onto a canvas and connecting them. Each component is one step, with parameters you fix or override at run time.

Playground

Test a flow and see its logic and responses in real time without building the rest of the application, or run a single component on its own.

Agents and tools

Agent components can call other components and whole flows as tools, running as a single agent or as several working together.

MCP server and client

Flows can be exposed as tools through Langflow's MCP server, and Langflow can connect to external MCP servers as a client.

API and deployment

Flows run from your own code through the Langflow API or are exported as JSON. The docs cover Docker, Kubernetes, remote servers and cloud providers.

Custom Python components

Components are written in Python, so you can edit the ones provided, write your own or install components shared by other users.

Sim

Workflow builder

Agent logic is laid out as connected blocks: agents, API calls, functions, conditions, routers, loops, parallel branches and human-in-the-loop steps.

Building in Chat

Describe a system in plain language and Chat scaffolds the workflows, tables and knowledge bases, which you then open, run and refine in the builder.

Knowledge bases, tables and files

Knowledge bases draw on uploaded documents and on connectors to sources such as Notion, Google Drive, Confluence and SharePoint. Tables hold structured rows, and files store agent inputs and outputs.

Triggers and deployment

Workflows start from a schedule, a webhook, an RSS feed or a table event, and are deployed as an API endpoint, a chat interface or an MCP server.

Logs and cost tracking

Each run is traced block by block, with token counts and cost per model, and alerts can be set on the logs.

Enterprise governance

The Enterprise plan adds SSO and SCIM provisioning, permission groups that decide which models and integrations a group may use, audit logs and data retention settings.

Langflow

• Langflow OSSFree

  The full MIT-licensed application, run with Langflow Desktop on macOS or Windows, a Docker image or the Python package.

• IBM Elite Support for LangflowCustom

  Optional subscription to IBM technical support for open-source deployments you run yourself. It covers support only and includes no software license.

Sim

• Free$0

  1,000 one-time credits, 1 workspace, 10 concurrent executions, 5 GB of file storage, 5 tables and 30-day log retention.

• Pro$21.25

  per user / month, billed annually ($255); $25 billed monthly

  6,000 credits a month plus 2,000 a week, 3 workspaces, teammates, 50 concurrent executions, 50 GB of storage and unlimited log retention.

• Max$85

  per user / month, billed annually ($1,020); $100 billed monthly

  25,000 credits a month plus 4,000 a week, 200 concurrent executions, 500 GB of storage, Sim Mailer, KB Live Sync, sandboxes and Slack Connect.

• EnterpriseCustom

  Custom credits and limits, with access control, SSO, SOC 2 compliance, self-hosting and dedicated support.

Langflow

No public discounts listed.

Sim

• Annual discount

  15% off with annual billing

  Sim's docs list annual billing at a 15% discount on all paid plans: Pro is $255 a year instead of $25 a month, and Max is $1,020 a year instead of $100 a month.