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Sim

Open source

A collaborative workspace for building, deploying and monitoring AI agents and workflows, with 1,000+ integrations, built-in tables and knowledge, in cloud or self-hosted form.

Open-source alternative to

GitHub stars
30k
Last commit
today
Repository age
21 months
Version
v0.9.10
Licence
Apache-2.0
Self-hosted
Yes

About Sim

Sim is a workspace for building, deploying and managing AI agents and workflows. You can build visually, conversationally or with code, connect more than a thousand integrations such as Slack, Notion, HubSpot, Salesforce and databases, and use any major LLM provider. The platform includes monitoring of runs, logs, schedules and workflow activity.

Beyond workflows, the same workspace also holds tables, files and knowledge. Tables act as a built-in database, files give the team and every agent one shared store, and knowledge bases serve as the agents' memory, ingesting files and structured data. The workspace is available in the browser and also as a desktop app for macOS 12 and later, for both Apple Silicon and Intel, which can be pointed at a self-hosted deployment.

Sim can be used as a cloud-hosted service at sim.ai or self-hosted, which requires Node.js 20 or newer and Docker. An interactive npx sim-setup wizard creates a deployment directory, provisions the database, generates secrets, writes the environment file and starts the services. The code is Apache-2.0 licensed and written in TypeScript with Next.js.

Key features

  • Visual, conversational and code-based agent building
  • 1,000+ integrations and major LLM support
  • Built-in tables, files and knowledge bases
  • Run, log and schedule monitoring
  • macOS desktop app
  • Interactive self-hosting setup wizard

Good fit for

  • →Building AI agents connected to business apps
  • →Automating workflows with LLM steps
  • →Giving a team a shared agent workspace
Tags
ai-agents
workflow-automation
low-code
llm
integrations
self-hosted
nextjs
agentic-workflow

Sim: questions and answers

What is Sim used for?
Sim is a collaborative workspace for building, deploying and monitoring AI agents and workflows, with 1,000+ integrations, built-in tables and knowledge, in cloud or self-hosted form. It is a good fit for building AI agents connected to business apps, automating workflows with LLM steps and giving a team a shared agent workspace.
Is Sim open source?
Yes. Sim is open source under the Apache-2.0 licence. Its source code is on GitHub at simstudioai/sim and is written mainly in TypeScript.
Is Sim free?
Yes. Sim is open source, so the software itself is free to use. A managed cloud version is also available, with paid plans from $25 per seat per month.
Can I self-host Sim?
Yes. Sim can be self-hosted on your own server or infrastructure.
What is Sim an alternative to?
Sim is an open-source alternative to Gumloop, Lindy and Vellum. Other open-source alternatives to Gumloop include Dify, Langflow and LoomFlow.
Is Sim actively maintained?
Yes. The most recent commit to Sim was on 2 October 2026, and the latest release is v0.9.10, published on 2 October 2026. The project has 30k stars on GitHub.

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