Guides

Practical, step-by-step guides for the STSApps tools

Short, useful walk-throughs that show how to get a real result with an STSApps tool. Each guide links straight to the tool it covers.

Calculators

How to split a group bill fairly

A clear, repeatable method for dividing a shared bill, plus the math that keeps every share honest.Updated Image tools

How to resize images for the web

How to choose dimensions, avoid upscaling, and keep image files small enough to load fast.Updated Marketing tools

How to build campaign URLs that report cleanly

How UTM parameters work, a naming convention that prevents split reports, and where QR codes fit in.Updated