About HandyToolkits

HandyToolkits is a growing set of free, no-sign-up online tools. The first ones compare things side by side — sizes, screens and weights — drawn to scale and shareable. Everything runs in your browser.

Who is behind it

Sandeep Bandyopadhyay — Mechanical & aerospace engineer. 20+ years in aerospace structures and mechanical systems engineering (Boeing, GE Aviation, Siemens Gamesa, ITER). Reviews every page on this site before it is published.

The site is published by SEINTGLOBAL LLC.

Where the numbers come from

Sizes and weights come from manufacturer specifications, official figures for buildings and landmarks, and NASA data for planets. Animals and people use typical adult values — real individuals vary, so every tool lets you enter your own measurements. Found a wrong number? Tell us and we'll fix it. Read the editorial policy.

Contact

Corrections and suggestions: contact@handytoolkits.com.