Open source alternatives to Zapier

4 projects on starwire do the same job. Ranked by how much of what Zapier does each one covers, read from its README and website. Ties go to the most active.

What Zapier does

Automate workflows between appscore
Triggers and actions across thousands of appscore
Multi-step workflows
Filters and branching logic
Schedules and webhooks
AI steps and agents
Run history and error alerts

Each dot in the table is one job, in this order. Square dots are core jobs and count double. Full means yes, half means partly. "See the evidence" under a project shows the line behind each one. Coverage is what a project documents, not how well it works or how hard it is to move to. How we score this

Project	Covers	Stars	Commits, 12 weeks	Last release	Closed vs opened	Setup	License
open-flowVisual workflow automation in TypeScript with isolated runs and a Control API	Replaces it94%	301+3	933	None	89%	Hosted version	Custom license
Covers all 2 core jobs. Partly: Run history and error alerts.See the evidence Automate workflows between appscoreYesuses AI to automate work across apps Triggers and actions across thousands of appscoreYes1,600+ apps and services. 20,000+ ready-to-use tools. Multi-step workflowsYesCombine JavaScript, connected apps, AI, branching, and human approval Filters and branching logicYesRoute work with conditions and give repeated logic a clear interface Schedules and webhooksYesStart work manually, on a schedule, through a webhook AI steps and agentsYesUse Agent Tasks when a job needs several tool calls. Run history and error alertsPartlyRun history keeps the execution tied to the revision
simWorkspace for building, deploying and monitoring agent workflows in Next.js	Replaces it89%	30k+63	2,535	3 days ago	80%	Hosted version	Apache-2.0
Covers all 2 core jobs. Not shown: Filters and branching logic.See the evidence Automate workflows between appscoreYesA workspace to build, deploy and manage AI agents and workflows. Triggers and actions across thousands of appscoreYes270+ integrations (5,400+ actions, 520+ triggers) Multi-step workflowsYesSim connects blocks, models, and integrations into agent logic. Filters and branching logicNot shownNeither the README nor the website mentions it. Schedules and webhooksYesMonitor runs, logs, schedules, and workflow activity AI steps and agentsYesBuild agents visually, conversationally, or with code Run history and error alertsYesSim traces every agent run block by block, including failures.
automatischSelf-hosted workflow automation tool with a visual low-code builder	Replaces it33%	14k+7	0	15 months ago	20%	Hosted version	Custom license
Covers 1 of 2 core jobs. Partly: Triggers and actions across thousands of apps. Not shown: Multi-step workflows; Filters and branching logic; Schedules and webhooks; AI steps and agents; Run history and error alerts.See the evidence Automate workflows between appscoreYeslets you connect different services like Twitter, Slack Triggers and actions across thousands of appscorePartlyWe integrate with the most widely used online services Multi-step workflowsNot shownNeither the README nor the website mentions it. Filters and branching logicNot shownNeither the README nor the website mentions it. Schedules and webhooksNot shownNeither the README nor the website mentions it. AI steps and agentsNot shownNeither the README nor the website mentions it. Run history and error alertsNot shownNeither the README nor the website mentions it.
huginnBuild agents that watch the web and act on events for you	Not checked yet	51k+20	216	5 days ago	100%	Needs a server	MIT

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