Numio is described as 'Buy, sell, trade, earn crypto with DeFi, collect NFTs, and more, while saving you up to 100x on Ethereum fees. All Numio products are non-custodial' and is a cryptocurrency exchange in the bitcoin & cryptocurrency category. There are more than 100 alternatives to Numio for a variety of platforms, including Web-based, iPhone, Android, iPad and Windows apps. The best Numio alternative is Bisq, which is both free and Open Source. Other great apps like Numio are Exodus, Coinbase, Binance and Robinhood.