I do like it, although for now preev still wins (sorry) because at least it has more fiat currencies. Yes, I know that you'll add those, it'll be a great step forward.

Although I use it rarely, I'd love to see something like https://thecryptocoinconverter.com/ which actually works (I've just looked up there a conversion from an altcoin to my local currency and it was awfully off), maybe you consider it as a second project or an extension.

But back to this actual project:
* it could be useful to update price from time to time automatically without the need for refresh
* it could be useful to put the price in page title

However, great job!