Dify vs Sim

Dify

Dify is the pragmatic choice when a team wants a visual builder for agents and retrieval that it can self-host today and hand to non-engineers tomorrow; the Community Edition is real software, not a demo, and the 158K GitHub stars reflect that. Pay for Cloud only if you do not want to run Docker — the $59 Professional tier is one workspace with three seats and metered message credits, so a developer team will outgrow it or self-host. It is less suited to teams that want code-first pipelines or a single-vendor model stack.

Pros

• +Open-source Community Edition with single-command Docker deployment and an active repository
• +One canvas covers workflows, agents and a knowledge pipeline with retrieval testing
• +Apps publish as API endpoints, embeds or MCP tools with logs and feedback built in
• +Plugin marketplace for model providers, tools, data sources and MCP integrations
• +Self-hosted and cloud editions share the same product, so you can move between them

Cons

• −Cloud tiers meter message credits, members and storage per workspace, and annual billing is the headline
• −The open-source licence carries commercial conditions (multi-tenant and logo clauses) rather than plain Apache
• −Visual workflows get hard to review and version once they grow past a few dozen nodes
• −Enterprise features such as SSO, RBAC and audit logs are reserved for the paid Enterprise edition

Sim

Sim covers the unglamorous half of agent work — memory, tables, file storage, logs — in the same place you draw the workflow, and the open repository means you can host it yourself if the meter bothers you. The meter is the catch: credits are the unit of everything, and an agent that loops or fans out consumes them faster than the per-seat headline suggests.

Pros

• +Three ways to build the same agent: visual canvas, prompt, or code
• +Ships knowledge bases, data tables and file storage alongside the workflow engine
• +Open source on GitHub with a documented self-hosting route
• +Free tier of 1,000 monthly credits, one workspace and 5 GB of storage

Cons

• −Every plan is metered in credits, so cost tracks usage rather than headcount
• −Concurrency is capped per plan — 10 simultaneous executions on Free, 50 on Pro
• −SSO, access control and SOC2 paperwork sit behind the quoted Enterprise tier

Is Dify cheaper than Sim?

They charge in different units, so there is no like-for-like answer: Dify starts at $59/mo, Sim at $25/seat/mo. Entry price is the lowest paid plan as we last verified it.

Does Dify or Sim have a free tier?

Both: Dify has a free tier, and Sim has a free tier.

Which has a public API, Dify or Sim?

Both ship a public API, so either can be built on; the fact table above shows the platforms each one runs on.