I built CalcTide — 131 free calculators on one fast, clutter-free site. What should I add next?

Hey everyone 👋

I've been building CalcTide (https://calctide.com), a free collection of 131

calculators across 9 categories — finance, health, math, converters, date & time,

business, and more.

The goal was simple: most calculator sites are slow, ad-stuffed, and confusing.

I wanted something that loads instantly, gives you a clean answer, and never makes

you sign up.

A few things I focused on:

• Fast, static pages (no clutter, mobile-friendly)

• Clear inputs and an instant result for every tool

• No login, no paywall — all free

I'd love feedback on two things:

1. Which calculators do you wish existed but can never find a good version of?

2. Anything that feels missing or confusing when you try a tool?

Happy to answer any questions about how it's built or where it's headed.

Thanks for taking a look!