Nomics https://nomics.com/ Most transparent crypto site!
Lists cryptocurrencies that are not listed on other exchange pages due to censorship.

CoinPaprika https://coinpaprika.com/

Best for desktop, laptop, computer.
Lists cryptocurrencies that are not listed on other exchange pages due to censorship.

CoinGecko. https://www.coingecko.com/ Best app for desktop and mobile phone!
You can create an account where you can gather your portfolio for a quick overview.

Everyone has their pros and cons but these are my top 3 best sites and apps for checking out new cryptocurrencies and checking current prices. To know which crypto exchange app is best for you, it is best to try different and see which one suits you best!