Mars: Currency Converter

Catching Comets

About this app

A currency converter where every row is both input and output. Tap any currency, type a number, and all the others update instantly. No base currency, no extra steps.

- 30 currencies to choose from, tap to convert between any of them
- Fresh rates each time you open the app, cached so it still works offline
- Swipe left to remove a currency, right to copy the amount, hold to move one to the top
- Pure black and white, switch between dark and light in settings
- No ads, no tracking, no account needed

I built this because every currency converter I found was either ugly, bloated, or both. I wanted one clean list where every number talks to every other number, nothing more.

Mars — Minimalist And Really Simple. A growing family of small, calm tools built around one idea: solve one problem well, and never fight for your attention. No ads, no tracking, nothing built to keep you hooked. Made by one person, out of conviction — tools that work for you, not on you.

What’s new

60 currencies to choose from, including the Vietnamese dong and many more frequently travelled destinations. Currencies without a meaningful minor unit, like yen and dong, now show as whole numbers. Settings are a tap away in the status bar.