Open Contacts is described as 'Even though we are not having any problem sharing our mobile number with all third parties, people in our phone book might have. We should not be sharing their contact information online. So, keep your contacts safe in a different database' and is a Contact Manager in the Office & Productivity category. There are six alternatives to Open Contacts for a variety of platforms, including Android, Android Tablet, Online / Web-based, Windows and iPhone. The best alternative is Google Contacts, which is free. Other great apps like Open Contacts are Simple Contacts (Free, Open Source), Sync.ME (Freemium), DW Contacts & Phone & SMS (Freemium) 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.
A simple app for creating or managing your contacts from any source. The contacts can be stored on your device only, but also synchronized via Google, or other accounts. You can display your favorite contacts on a separate list.
Contact is a free and low size app for contacts sharing. It simplifies sharing and receiving contact information, helps to easily merge contacts, allows to call directly from app, has user friendly interface, and does not need internet connection to work.