A small shift changes everything.
Parallax is a hub of tiny, beautifully simple calculators for the questions you'd Google but wish had a prettier home.
What this site is
Parallax is a small collection of free, ad-supported web calculators. Each tool answers one curiosity — how old you'd be on Mars, what an average life looks like as a grid of weeks, where your years have quietly gone.
How it's built
Every tool runs entirely in your browser. No accounts, no backend, no tracking. The site is plain HTML, CSS, and a small amount of JavaScript — it loads instantly and works offline once you've visited a page.
How it's paid for
Parallax shows display ads from Google AdSense. That's the only way it's funded. If you'd like to support the site without buying anything, turning off your ad blocker here helps.
Who made it
A small team of two, making tools we wanted to use ourselves. Questions or suggestions? Send us a note.
Credits
The "life in weeks" idea originates with Tim Urban's 2014 essay. Orbital periods are standard sidereal values; day lengths are planetary averages.