ProKeys is described as 'Save time and effort in emails, etc. with ProKeys! Define snippets, do math in browser, auto complete braces, and much more' and is an app in the Web Browsers category. There are five alternatives to ProKeys for a variety of platforms, including Windows, Online / Web-based, Android, iPhone and Chrome OS. The best alternative is PhraseExpress. It's not free, so if you're looking for a free alternative, you could try Texpand or Auto Text Expander for Google Chrome. Other great apps like ProKeys are PhraseExpander (Paid) and QuickTextPaste (Free).
PhraseExpander saves time typing texts, filling forms, launching programs, opening websites and automating common tasks by using customized shorts. It can also correct your spelling mistakes and includes a clipboard history manager.