# automaticallySync A Boolean value that determines whether the engine syncs automatically. ``` @property (assign) BOOL automaticallySync; ``` ## Discussion By default, the sync engine uses the system scheduler to automatically schedule both send and fetch operations. If an operation fails due to a recoverable error, such as a network failure, or when the server is enforcing request limits, the engine reschedules those operations as necessary. Unless you have a specific need, prefer to use the default behavior in your app. If you set this property’s value to , use [`fetchChangesWithCompletionHandler:`](/documentation/CloudKit/CKSyncEngine-4b4w9/fetchChangesWithCompletionHandler:) and [`sendChangesWithCompletionHandler:`](/documentation/CloudKit/CKSyncEngine-4b4w9/sendChangesWithCompletionHandler:) to invoke immediate sync operations, allowing for more control over when your app syncs its records. For example, you may want to sync at a specific time of day, or deterministically simulate certain conditions in your unit tests. The default value is . --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)