This demo project shows the use of Flutter Web together with the flutter_web3 package.
The goal was to connect to the Ethereum blockchain via a cryptowallet, connect to the Smart Contract (the address 0x6c6ddD04ADd0a6FC2c121E7DeB4e95744A8B9061 in lib/main.dart is the one available in my Ethereum network deployed with Ganache, so it does not make sense to other people) and use it.
The built UI resembles that which I have built for another demo of the library web3.js. In that case I used HTML, CSS and JavaScript together with Bootstrap and jQuery.
I would say this demo works better than the previous one, but please take a look at it here if you wish!