Thanks for all the suggestions!
I've added euro support, as well as showing the fetched time (I decided to not go for automatic refreshing since I felt the UX is better if you manually refresh):
https://user-images.githubusercontent.com/100208905/167059806-bc491cae-bbe3-41e5-a90b-aa9a58f2dcbe.pngThis week's To Do: fetch the exchange on the backend and not rely on coingecko.I'm also not in love with the domain url (.me), but the nicer alternatives are either taken or too expensive. preev is a great catchy name and it works amazing. Dark mode is a most for me (I spent a lot of time with lights dimmed and babies asleep).
I always appreciate projects with a platform that can help the community I've bookmarked some of the Bitcoin conversion platforms and I'm going to bookmark yours for reference, comparison, and recommendations. I also have one set up and it's been online for 5 years now I hope you can keep up yours and sustain it, our community needs something like this.
Congratulations on launching your converter and good luck.
These are now the converter I'm using and have included yours. (...)
Thanks, happy to see btc2fiat.me included.
It's good that you created it as open source, but I saw many similar websites already available, so you need to provide something special if you want to attract more people.
You may want to add direct github link and open source license on the bottom of the page (without going to About page).
You can easily use Coingecko directly (since you are using their API) with uBlocker Origin extension, and you won't see any ads on their page

I know other useful websites that can convert Bitcoin to fiat currencies and smaller units, one of them was created by our forum member Bitmover if I remember correctly:
https://bitcoindata.science/bitcoin-units-converter.htmlI added the link to Github on the footer, but it might still not be clear. Maybe just write "Open source"? Also, the main point was to make it very lightweight to load.