Sync Backup & Merge Contacts is a free Android app developed by Code Technologies that allows users to backup, restore, and merge contacts from their smartphones without needing a computer. With this app, you can easily backup your contacts to the cloud and restore them to any mobile device, or export them as vCard files to use in other applications or share them via email, Dropbox, Google Drive, and more.

This app also features a powerful contact management tool that allows you to merge or replace duplicated contacts, delete multiple contacts selectively, and get notifications on new restores from other devices. Additionally, the premium service provided by Google's Admob framework lets you disable ads and switch them on/off from the navigation window inside the app. Overall, Sync Backup & Merge Contacts is an excellent app for managing your contacts and ensuring that you never lose them again.