Sim
Verified Oct 15, 2026 ActiveOpen-source workspace for building AI agents from a visual canvas, a prompt, or code
Listed on EffectHub ·
Pricing
- Pricing model
- Freemium
- Paid options from
- $25/seat/mo
- Billing
- Per seat, monthly
Free includes 1,000 one-time credits, one workspace and 10 concurrent executions. Pro is $25 per user/month for 6,000 credits plus 2,000 a week, three workspaces and unlimited log retention; Max is $100 per user/month for 25,000 credits plus 4,000 a week. Annual billing saves 15%; Enterprise (SSO, access control, SOC2, self-hosting support) is quoted.
Use tool ↗About Sim
Sim is a workspace for building and running AI agents. An agent is assembled on a visual canvas, described in chat, or written in code, and can call 270+ integrations and every major model provider. The platform carries the supporting parts too: knowledge bases, data tables, file storage shared between team and agents, and execution logs that trace each run block by block, including cost and failures. The code is open source on GitHub, with about 29.8k stars and a self-hosting path. The hosted service is metered in credits and sold per seat, with a one-time free allowance and paid plans at $25 and $100 per user per month; SSO, access control and SOC2 sit in a quoted Enterprise tier.
- Platforms
- Web · API
- API
- Yes
- Last verified
- Oct 15, 2026
Verified sources
- Pricing page: Free $0 with 1,000 one-time credits and 10 concurrent executions; Pro $25 per user/month with 6,000 credits/month plus 2,000/week; Max $100 per user/month with 25,000 credits/month plus 4,000/week; Enterprise custom; annual billing -15% (15 October 2026)sim.ai ↗
- Home page: open-source AI workspace connecting 270+ integrations and every major LLM; GitHub counter shows 29.8k (15 October 2026)sim.ai ↗
- Terms of Service name the operator Sim Studio, Inc. and are governed by California and US federal law (15 October 2026)sim.ai ↗
Is Sim legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- Domain registered
- Apr 23, 2018 (8 years ago)Registry record (RDAP), registrar GoDaddy.com, LLC, looked up Sep 11, 2026
- TLS certificate
- Issued by Amazon, valid until Mar 17, 2027Seen in our own connection to the site on Oct 15, 2026
- Last checked
- Oct 15, 2026The site answered
- Operated by
- Sim Studio, Inc., United StatesOur research, card verified Oct 15, 2026
Pros & cons of 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, chat, 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 plan with 1,000 starter credits, one workspace and 5 GB of storage
Cons
- Every plan is metered in credits, so cost tracks usage rather than headcount
- The free allowance is one-time, not monthly, so ongoing use means a paid seat
- 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
Best for
- Teams that want a visual agent builder they can also self-host
- Connecting agents to many SaaS tools without writing the glue code
- Prototyping an agent and keeping the traces to debug it afterwards
Not for
- Buyers who need a fixed monthly bill rather than a credit budget
- Single-prompt automations that a short script would already cover
Watch out: The pricing page lists credits per user but concurrency as a flat plan-level number, so a busy shared workspace can hit the execution ceiling long before it runs out of credits — confirm which limit applies before committing.
Alternatives to Sim
Sim head-to-head
Side-by-side fact sheets against the competitors our research or their makers name — pricing, platforms, API and both verdicts on one page.