OneContact is described as 'Spend no more than 1 minute to keep your friends and colleagues up-to-date on where to reach you best. Create your contact card today and then just send your friends a link. That's it!' and is an app in the Office & Productivity category. There are three alternatives to OneContact for a variety of platforms, including Online / Web-based, Windows, Windows S, Windows Phone and Android. The best alternative is Google Contacts, which is free. Other great apps like OneContact are Contacts (Paid) and Microsoft People (Free).
Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
Contacts is a flexible and convenient place to store information for everyone you know. It’s easy to import names, numbers, addresses, and photos from Facebook, LinkedIn, Google, and even Microsoft Exchange.