8 Best Sim.ai Alternatives in 2026 (Open Source)
Sim.ai — Sim is the collaborative workspace to build, deploy, and monitor AI agents and workflows. Used by 100,000+ builders. Provides a unified workspace combining chat, workflows, tables, files, and knowledge with both cloud and extensive self-hosting options.
These 8 open-source tools do the same job. They are ordered by how closely they match Sim.ai, with live GitHub data so you can see which projects are actively maintained.
| Tool | GitHub stars | Stars / 30d | Last commit |
|---|---|---|---|
| Sim.ai(original) | 29.8k | +2,480 | 2026-09-30 |
| iX | 1.0k | +0 | 2024-03-03 |
| Flowise | 55.5k | +697 | 2026-08-13 |
| LLMStack | 2.3k | +2 | 2024-12-11 |
| AgentPilot | 568 | +5 | 2025-05-15 |
| Ekko Studio | 11.3k | +938 | 2026-09-30 |
| AutoGPT | 187.6k | +763 | 2026-09-30 |
| FastGPT | 29.8k | +2,481 | 2026-09-30 |
| n8n | 206.4k | +4,014 | 2026-09-30 |
1. iX
Autonomous GPT-4 agent platform
What sets it apart: vs LangChain/AutoGen: visual no-code drag-and-drop editor with native multi-agent orchestration and horizontal worker scaling — design complex agent workflows visually instead of writing code
Best for: Building custom multi-agent teams with visual no-code editor; Rapid prototyping of AI workflows without coding; Organizations needing self-hosted parallel agent execution at scale
2. Flowise
Build AI Agents, Visually
What sets it apart: Easiest no-code AI agent builder with one-command setup (npx flowise start) — simpler than Langflow, targeting non-developers who want AI workflows without Python
Best for: Non-technical users building AI chatbots and RAG applications; Quick prototyping of LLM workflows with drag-and-drop
3. LLMStack
No-code multi-agent framework to build LLM Agents, workflows and applications with your data
What sets it apart: vs Flowise / Dify: no-code AI platform with multi-tenant support, built-in vector DB, and Slack/Discord integration — deploy AI agents from Google Drive/Notion data without writing code
Best for: Non-developers wanting to build AI agents and chatbots without coding; Teams needing multi-LLM chain workflows with data integration; Organizations wanting self-hosted AI platforms with multi-tenant support
4. AgentPilot
A versatile workflow automation platform to create, organize, and execute AI workflows, from a single LLM to complex AI-driven workflows.
What sets it apart: vs ChatGPT/Claude desktop: local multi-agent workflow builder with graph-based design, 20+ LLM providers via LiteLLM, branching chats, and built-in multi-language code interpreter
Best for: Power users building complex multi-agent workflows on desktop; Developers wanting visual graph-based agent orchestration with code execution
5. Ekko Studio
Ekko Studio is a local-first AI workspace for multi-agent chat, coding, and visual workflows, available on desktop and the web.
What sets it apart: Combines local-first multi-agent runtime management with visual workflow automation across seven different agent frameworks in one workspace.
Best for: developers building multi-agent systems; teams needing local-first agent workspaces; visual workflow automation for AI agents
6. AutoGPT
AutoGPT is the vision of accessible AI for everyone, to use and to build on. Our mission is to provide the tools, so that you can focus on what matters.
What sets it apart: Pioneer of autonomous AI agents with visual workflow builder — most well-known brand in autonomous agents, unlike coding-focused frameworks like LangChain
Best for: Building autonomous multi-step AI workflows without coding; Content automation pipelines (video generation, social media posting)
7. FastGPT
FastGPT is a knowledge-based platform built on the LLMs, offers a comprehensive suite of out-of-the-box capabilities such as data processing, RAG retrieval, and
What sets it apart: Provides a visual workflow orchestration system specifically for building and deploying AI agents.
Best for: developers building complex AI agent applications; visual workflow design for agents; deploying question-answering systems
8. n8n
Fair-code workflow automation platform with native AI capabilities. Combine visual building with custom code, self-host or cloud, 400+ integrations.
What sets it apart: Unlike Zapier (pure no-code, closed-source), n8n combines visual workflow building with inline JavaScript/Python code and self-hosting, making it the go-to for technical teams who need both flexibility and control
Best for: Technical teams building AI-powered workflow automations with visual + code flexibility; Enterprises needing self-hosted automation with SSO and air-gapped deployment
FAQ
- What are the best alternatives to Sim.ai?
- The closest open-source alternatives to Sim.ai are iX, Flowise and LLMStack, followed by AgentPilot, Ekko Studio and AutoGPT. They are ranked by how closely they match what Sim.ai does.
- Which Sim.ai alternative is the most popular?
- n8n has the most GitHub stars among Sim.ai alternatives, with 206,374 stars.
- Which Sim.ai alternative is the most actively maintained?
- By recent activity, n8n (3,609 commits in the last 90 days) is the most actively developed alternative.