ContactZapp

ContactZapp is for people who use separate personal and work address books and want contacts kept consistent across them. It syncs contacts between Google, Microsoft 365 and Outlook, Apple iCloud, and CardDAV servers. You can choose two-way syncing or make an account read-only, and set syncing to run hourly, daily, or manually. The app finds likely duplicate contacts within and across accounts, then lets you review and merge them, keeping details such as phone numbers, email addresses, and postal addresses. It also records changes so you can review or undo them. ContactZapp may suit people who want one up-to-date contact list across multiple services without copying changes between accounts by hand.

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