Noble thought! We practically have loads of new aggregators available but only few are useful. If you can create a new app with a complete list of useful tools, that would be great!

Price comparison tool between exchanges is a great idea. I don't know if we have any other tool in the market with similar functionality!

We often use coinmarketcap website to check the prices of the cryptos and majority of the time, we only check the prices of the top 10 cryptos in the market. If you can create a similar list of cryptos and bifurcate the list based on volume and liquidity, that will be grand! All the best!