Free open-source SaaS boilerplate
Open SaaS Alternative: build SaaS with source-owned modules.
Compare Open SaaS with StackFoundry when you want a free SaaS path but prefer source modules for an existing app.
Builders who like a free full-stack framework path and are comfortable adopting its architecture.
What Open SaaS is known for
Free open-source SaaS boilerplate positioning
Auth, payments, file uploads, jobs, and AI-ready features
A framework-led app architecture
A full starter application model
Where StackFoundry differs
Also free to use, with MIT-licensed source
Designed to add modules into an app you already own
No requirement to adopt a different full-stack framework
Registry recipes explain install order without hiding the source
When to choose StackFoundry instead
You want the open-source economics, but prefer a Next.js source registry and module-by-module installs.
Open SaaS alternativeopen source SaaS starterfree SaaS boilerplate
Source Registry
Dry-run a complete SaaS recipe before adopting any app shape.
Start with API SaaS, inspect the exact source files, then decide whether the modules belong in your app.
pnpm stackfoundry add recipe api-saas-starter --target ./my-app --dry-run