Sim

Automation

Sim

Open-source AI agent workspace you can self-host for free

What it is

Sim is an open-source AI workspace for building, testing, and deploying AI agent workflows on a visual canvas. It connects to 1,000+ integrations and every major LLM provider, and the entire platform can be self-hosted for free under an Apache 2.0 license instead of requiring a subscription from day one.

Prototyping AI agent workflows without committing to a subscriptionDocument Q&A grounded in your own filesCustomer support automationInternal tooling that needs to stay self-hosted for data control

Price: $25; free tier available
Free tier: Yes; no card required
Platforms: 4; Web · Linux

What you get free vs paid

Verdict

Where it wins and loses

Pros

Fully open source and free to self-host, with no vendor lock-in
Visual canvas keeps multi-step workflow logic easy to follow
Copilot generates and fixes workflow nodes from plain-language instructions
Supports local models through Ollama for fully offline setups

Cons

Integration library and template count are smaller than mature competitors like n8n or Latenode
Self-hosting requires comfort with Docker, Bun, and PostgreSQL if you skip the cloud plan
Younger company, so long-term roadmap depth is less proven than incumbents

A genuinely good pick if you want a free, self-hostable AI agent builder and don't mind a smaller integration library than the big incumbents.
— QuestLoops verdict

Capabilities

Core features

Visual AI agent workflow canvas
Copilot node generation from natural language
1,000+ third-party integrations
Support for every major LLM provider
Local model support via Ollama
Self-hosted or cloud deployment
Realtime execution and debug view
Built-in vector store for document Q&A

All platforms

WebLinuxmacOSWindows

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Common questions

Sim · 3 questions

Is Sim free?

Sim offers a free tier you can use without paying. Browse QuestLoops for verified ways to get more out of it for free.

How much does Sim cost?

Sim's paid plans start at about $25. There's also a free tier for lighter use. Pricing changes over time — QuestLoops focuses on legitimate ways to reduce or avoid that cost.

What are the best alternatives to Sim?

You can compare Sim side-by-side with similar Automation on QuestLoops to weigh free-tier limits, pricing, and tradeoffs before deciding.

Community workarounds

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