Prokey is described as 'Optimum is a web-based hardware wallet that allow you manage 1500+ cryptocurrencies through a browser only, without install any application and bridges. on the other hand, it's protected from supply-chain attack because of using mutual authentication' and is a Crypto Wallet in the Bitcoin & Cryptocurrency category. There are more than 25 alternatives to Prokey for a variety of platforms, including Android, iPhone, Mac, Windows and Linux. The best alternative is Exodus, which is free. Other great apps like Prokey are BitPay Wallet (Free, Open Source), Coinomi (Free), Blockchain Wallet (Free, Open Source) and Cake Wallet (Free, Open Source).
Manage your finances in one app with the secure, open-source BitPay Wallet. Get up and running fast with blockchain security, store and send funds, buy gift cards from major brands, and turn cryptocurrency into dollars with the BitPay Visa Card.
Blockchain is one of the few wallet applications that keeps control over your money in your own hands. In the original spirit of Bitcoin, it is physically impossible for BlockChain to "freeze" your account or any such nonsense.