- Category
- Agent platforms
- From
- $0 / forever
- Pricing model
- freemium
- Free tier
- Yes
- Deployment
- Both
- Interface
- Web
- Open source
- Yes
- Public API
- Yes
- Model / LLM
- Supports every major LLM
Facts re-verified
On this page
Our verdict
Sim positions itself as an open-source, all-in-one workspace for building and running AI agents, pairing workflow orchestration with a Knowledge Base, Tables, and a shared file store.
The API is unusually well documented for a young product, with explicit sync/async execution, cursor pagination, and 429 handling via Retry-After headers. Self-hosting and 29.4k GitHub stars back the open-source claim.
But core enterprise features like SSO, SOC2 compliance, and self-hosting sit behind the Enterprise tier, and the vendor's own pages disagree on how many integrations it actually offers, 244 versus 1,000+.
Independent coverage (GitHub's own repo page, plus write-ups at rywalker.com and dev.co) corroborates the open-source claim and the ~29k GitHub stars, but the 100,000+ builder figure and the 244-vs-1,000+ integrations discrepancy remain vendor-reported only — treat those two specifically as unverified.
What is Sim?
Sim is an open-source AI workspace for building, deploying, and managing AI agents, combining workflow orchestration with a Knowledge Base, Tables for structured data, and a shared file store. It supports every major LLM and connects to third-party apps, though the vendor's own pages list either 244 or 1,000+ integrations depending on where you look. Sim says it serves over 100,000 builders, is SOC2 compliant, and offers self-hosting as an alternative to its cloud product.
What does Sim do?
Sim lets teams assemble AI agent workflows that pull in LLMs, connected apps, and internal data. The Knowledge Base gives agents retrieval access to your documents, Tables gives them structured records to read and write, and Files acts as one shared store for team and agent content. Every agent decision is traced in live logs with real cost visibility attached to each run.
Workflows run through MCP-compatible tooling and can be published to a REST API: a workflow must be deployed before it can be called, executions default to synchronous (the API blocks until the run finishes), and long jobs can be triggered asynchronously with async:true, moving through queued, running, completed, failed, cancelled, or paused states.
List endpoints for workflows, logs, and audit logs use cursor-based pagination, every v2 endpoint enforces its schema and returns 400 on unrecognized fields, and rate limits (which vary by subscription plan and apply separately to sync and async calls) return 429 with a Retry-After header. A Billing Status endpoint exposes current credit and storage usage.
How Sim works
- Build a workflow in Sim connecting LLMs, integrations, the Knowledge Base, and Tables.
- Deploy the workflow, which is required before it can be executed via the API.
- Trigger runs synchronously for immediate results, or asynchronously with async:true for long-running jobs, and track status through queued, running, completed, failed, cancelled, or paused.
- Review live traces, logs, and per-run cost, and check usage through the Billing Status endpoint.
Key features
- Knowledge Base
- Gives agents memory of your data so workflows can retrieve and reason over internal documents.
- Tables
- Structured data store that agent workflows can read from and write to.
- Files
- One unified file store shared across the team and its agents.
- Workflow tracing
- Live traces and logs record every agent decision alongside real cost per run.
- MCP support
- Connects agent workflows to Model Context Protocol tools and servers.
- REST API
- Deploy a workflow, then run it synchronously or asynchronously, with cursor pagination and documented rate limits.
What are Sim's use cases?
- Cross-app agent automation
- A team wires an agent workflow through Slack, Notion, GitHub, and Gmail so routine cross-tool work runs without manual handoffs.
- Internal knowledge assistant
- An agent answers employee questions grounded in company documents ingested into the Knowledge Base.
- Structured data workflows
- A workflow uses Tables to track and update records like leads or support tickets as an agent processes them.
- Embedded agent execution
- A developer deploys a Sim workflow and calls it from an external application via the API, using async execution for longer jobs.
Who is Sim for?
- Teams building internal AI agent workflows that need to connect many SaaS apps
- Developers who want a self-hostable, open-source alternative to closed agent platforms
- Enterprises that need SOC2 compliance and SSO for agent deployments
Not forSmaller teams needing self-hosting or SSO on a budget: those controls are Enterprise-only, so anyone wanting compliance features without an Enterprise contract is blocked by plan tier, not product capability.
What does Sim integrate with?
- Slack
- Notion
- GitHub
- Gmail
Why use Sim?
- Vendor reports Sim is trusted by over 100,000 builders
- 29.4k GitHub stars indicate an active open-source project
- SOC2 compliance and a self-hosting option target security-conscious deployments
- API documentation covers sync/async execution, cursor pagination, and 429 rate-limit handling in detail
What are Sim's pros and cons?
What's great
- Open-source with 29.4k GitHub stars and a self-hosting option for teams that don't want to run on the vendor's cloud
- Well-documented API with synchronous and asynchronous execution, cursor pagination, schema validation, and clear 429/Retry-After handling
- Bundles Knowledge Base, Tables, and Files so agents can work with unstructured and structured data without bolting on separate tools
Watch-outs
- Self-hosting, SSO, and SOC2 compliance are gated to the Enterprise plan, so Free, Pro, and Max users cannot self-host
- The vendor's own site states two different integration counts (1,000+ in navigation versus 244 on the integrations page), making real coverage hard to verify
- Free plan log retention is capped at 30 days versus unlimited retention on paid plans
- Details here come from the vendor's own site; independent reviews are not available yet.
- Sim's site gives conflicting integration totals (1,000+ in navigation copy vs 244 listed on the integrations page), so the actual number of supported apps is unclear.
Sim pricing
Free
$0 / forever
Pro
$25/user
Max
$100/user
Enterprise
Custom
Frequently asked questions
Does Sim have a free plan?
Is Sim open source?
Can I self-host Sim?
Does Sim have an API?
How many integrations does Sim support?
Anything to add?
This page is researched and re-verified by our editors — but the people who actually use Sim know things we cannot see from the outside.
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