Sim vs Dify: Open-Source AI Workspace vs LLM App / RAG Platform
Compare Sim and Dify for AI agents, RAG applications, workflow automation, licensing, deployment, and pricing. Learn when an AI workspace or an LLM app platform fits your team.
Choose Sim for an AI workspace that combines agents, workflows, Tables, Files, Knowledge Bases, and deployment surfaces under an Apache 2.0 license. Choose Dify for an LLM application platform centered on RAG and conversational experiences; review its current license before building a commercial product on it.
Sim supports conversational, visual, and programmatic building in one workspace. Dify documents a visual workflow and application-building model for LLM apps.
At the time of writing, Sim pricing lists Free, Pro, and Max plans, while Dify pricing lists Sandbox, Professional, Team, and Enterprise options. Compare the live pages before you buy.
Sim can deploy workflows as an API, a hosted chat experience, or an MCP tool. Dify documents application publishing and API access for its LLM applications in its deployment documentation.
Sim is a strong Dify alternative when you need a permissively licensed workspace for agents, business automation, and workflows that go beyond retrieval and chat. Dify is a focused option when the job is shipping a production LLM application centered on RAG and conversational interfaces, as reflected in its application and workflow documentation.
Dify serves developers who want a platform for creating and deploying LLM applications. Its documented workflow, knowledge, and application capabilities support RAG assistants and chat experiences. Sim serves technical builders who need a broader workspace where agents can reason, process structured data, call business tools, and run through deterministic control flow in the same graph.
The clearest split is license and scope. Dify ships under the Dify Open Source License, which is based on Apache 2.0 with additional conditions. Sim releases its core under standard Apache 2.0, a permissive license that allows commercial use, modification, and distribution subject to its terms.
Your application is RAG-first, where document retrieval defines the product. Dify's Knowledge documentation explains its knowledge-base workflow.
Your application is chat-first, where a conversational interface is the primary surface. Dify documents chat-oriented application types in its application guide.
Both products can be self-hosted: Sim publishes its source and license, while Dify documents self-hosted deployment. Self-hosting gives you control of infrastructure. The license determines whether and how you may modify the software, distribute it, sell access to a service built on it, or put your own brand on it.
Dify's license text adds conditions beyond Apache 2.0, including a condition related to multi-tenant operation and a condition related to Dify branding and copyright information in the frontend. Those terms can matter to SaaS vendors, agencies running shared client portals, and platforms that plan to resell a hosted version. Internal deployments and products where Dify is used only behind the scenes may present a different analysis, so map the license against your architecture.
Sim's open-source core uses standard Apache 2.0. The Apache License 2.0 text permits commercial use, modification, and distribution under its notice and attribution requirements, and includes an express patent grant. Sim enterprise offerings, trademarks, hosted services, and third-party components can carry separate terms.
Have counsel review the current repository license when multi-tenant resale, customer-facing branding, or redistribution is part of your business model. For a broader explanation of the distinction, see Apache 2.0 vs fair-code.
Dify centers on a visual workflow editor and application model. Its workflow guide describes connecting nodes to create LLM application flows, while its agent documentation covers agent-oriented workflows. That model fits developers who want an application-oriented interface without assembling the orchestration stack themselves.
Sim gives you three ways to build. Describe the system to Mothership in plain language, construct it on the visual canvas, or work through APIs. The same workspace can hold the resources those paths use, so a team can start conversationally and refine visually or programmatically.
Mothership operates across workspace resources rather than only a single workflow. It can create and modify workflows and work with Tables, Files, and Knowledge Bases from natural-language instructions. This is useful when the build process itself needs access to the resources a workflow will use.
Both platforms combine model reasoning with explicit logic, but their emphasis differs. Dify provides agent and workflow nodes for LLM applications. Sim combines Agent blocks with conditions, routers, loops, custom code, parallel execution, and approval steps in one graph. Predictable steps can stay deterministic while judgment and tool selection go to a model.
Sim also supports real-time workspace collaboration, allowing teammates to work on shared workflows. Teams comparing the category can use open-source AI agent platforms to evaluate the trade-offs among visual builders, frameworks, and workspaces.
Dify puts RAG at the center. Its Knowledge feature indexes documents for retrieval and supplies retrieved context to applications. If document retrieval and conversation define your product, that focus can be an advantage.
Sim supports retrieval and connects it to other workspace resources. The workspace model links Knowledge Bases with native Tables and Files. Knowledge Bases can supply semantic retrieval, Tables can hold structured records and workflow state, and Files can be used as inputs or outputs. One workflow can retrieve policy text, update a case record in a Table, and save a generated report as a File.
Sim connects that context to action through integrations, API calls, custom JavaScript, and MCP tools. Rather than comparing catalogs by a single count, evaluate whether the specific services, authentication patterns, and workflow controls you need are available. For background on publishing or consuming reusable tools, see what an MCP server is.
The practical difference is scope. Dify is a focused choice for RAG-first and chat-first applications. Sim fits workflows that need document retrieval, structured operational data, persistent files, and actions across external systems in the same workflow.
Dify documents production application publishing, APIs, and self-hosted deployment. Review those guides alongside its pricing page to understand which hosted and enterprise options apply to your plan.
Sim exposes deployed workflows as a REST API, a hosted chat experience, or an MCP tool through a workflow MCP server. The MCP surface lets compatible AI systems discover and call a deployed workflow as a reusable tool. You can evaluate Sim Cloud or self-host the Apache 2.0 core on infrastructure appropriate for your team.
Both platforms support model-provider connections. Dify documents supported providers in its model-provider guide. Sim offers managed access and bring-your-own-key options, and can connect to local model infrastructure. Choose based on the providers, key-management approach, and hosting pattern you actually need rather than a raw model count. For a deeper Sim-specific guide, read BYOK and multi-model agent building.
Dify's pricing page presents plans per workspace, while Sim pricing presents plans per user with usage credits. The two models produce different cost curves depending on team size, workload, and how many separate environments you need.
The free plans are not directly interchangeable. Dify's pricing page describes Sandbox as a limited-credit option, while Sim's pricing page describes its free plan and usage allowance. On paid plans, Dify's workspace pricing may suit a small group sharing one environment, while Sim's seat pricing changes with headcount. Model and tool consumption can also affect total cost.
Both vendors can change prices, credits, limits, and terms. Check the live Dify pricing and Sim pricing pages before you buy.
Dify fits developers building RAG-first or chat-first LLM applications. Its application builder and knowledge workflow provide a focused route to an LLM application without assembling retrieval and chat infrastructure from scratch.
Sim fits builders who need agents that work across business tools and data. A developer or technical founder can combine model reasoning with conditions, code, integrations, Tables, Files, and Knowledge Bases, then deploy the result as an API, hosted chat experience, or MCP tool.
Functional teams fit Sim when several people need shared workflows, credentials, context, and execution history. Operations, engineering, product, and RevOps can run automation in one workspace instead of treating every project as a separate application.
For enterprises, compare governance, self-hosting, key management, security requirements, and commercial terms against a real deployment. Dify remains a focused fit when an enterprise program is specifically about RAG applications and conversational interfaces.
Will your product serve multiple commercial tenants or carry your own branding? Review Sim's Apache 2.0 license and the Dify license against your deployment plan and UI.
Are you building a RAG-first chat application or a broader automation system? Consider Dify for a chat-first LLM application platform with retrieval capabilities. Choose Sim when agents need to combine automation, workspace resources, and deterministic logic.
Does your team build together? Evaluate the collaboration, permissions, and governance model each product provides for the plan you will use.
Which pricing structure fits? Compare Dify's workspace pricing with Sim's seat and usage pricing using your actual seat count, environment count, and workload volume.
Then run a representative workflow through both. You can start with Sim or inspect the Sim core repository before choosing a deployment path.
FAQ
Is Sim a good Dify alternative?
Sim is a strong alternative for teams that need agentic workflows and business automation alongside retrieval and chat. The better choice depends on whether your product is primarily an LLM application or a connected operational workflow.
Why should I compare licenses before choosing an AI platform?
A license determines the rights to use, modify, distribute, and host software. Review it against your actual deployment, commercial, multi-tenant, and branding plans before committing to a platform.
Does Sim support RAG?
Yes. Sim Knowledge Bases support retrieval workflows, and they can be used alongside Tables, Files, agents, tools, APIs, and scheduled workflows.
Can Sim be self-hosted?
Sim core is available under Apache 2.0. Teams can use the repository and deployment documentation to evaluate whether self-hosting fits their infrastructure and operational requirements.
How should I compare Sim and Dify pricing?
Model the cost using your real seat count, workspace count, environments, and expected model or tool usage. Check each vendor’s current pricing page because plans, credits, and limits can change.
