Calculator ownership
Sell a clone of one existing calculator with light branding or embed help.
Presale
Buy this calculator or get a custom one.
This page is the bridge from free utility into a small sale or a larger presale conversation.
Custom calculator build
Use this lane for bigger presales, more custom logic, and stronger implementation structure.
What this keeps clean
Separate site
This preview is its own project and does not replace the tools reference site.
Free-first
The calculators still do the job before any upsell appears.
Presale-friendly
You can attach real PayPal and Stripe links later without changing the page system.