What is coreduetd and why is this process running on my Mac?

Just shortly after starting the Apple Mac, it can happen that you are in it Activity indicator finds the coreduetd process with a comparatively high CPU load. This usually doesn't last long, but is only due to a few queries that the process makes. But what exactly does coreduetd actually do on macOS? I will answer this question for you in this guide. The good news right from the start: it is not um malicious software.

The coreduetd process on the Mac: Handoff and synchronizations

The coreduetd background process is, as its name suggests, a systemDaemon from macOS, which is responsible for synchronizing devices. Broken down, the name is “Core Duet Daemon.” He's since OS X Yosemite 10.10 mainly responsible for ensuring that two devices are coordinated and work in unison (i.e., in a figurative sense, forming a “duet”).

It ensures that “Handoff” works on the Mac and other Apple devices. This makes it possible for something started on device A to be continued seamlessly on device B. From documents to be edited to open websites in Safari, a lot can be automatically exchanged between Mac, iPhone, iPad and Watch.

Thanks to the coreduetd process, Apple devices that are logged into iCloud with the same Apple ID and are within easy reach of one another are not only exchanged. In addition to the data to be synchronized ad hoc, iCloud Drive queries and synchronization with Office 365 (if used) are also implemented. With coreduetd you stay up to date in various areas.

The requirements for Handoff use 

For example, to be able to seamlessly use Safari tabs open on the iPhone on the Mac without having to copy and send the link to the website, Handoff can be used. Continuing to work on documents via iCloud synchronization is also part of the Handoff feature. However, there are some requirements that must be met for implementation:

  • All devices must be signed in to iCloud with the same Apple ID.
  • Bluetooth and WiFi must be activated on each device.
  • The Handoff feature must be activated on every device.
  • Mac with macOS Ventura or later: About Apple logo -> System settings ... -> General -> AirDrop & Handoff Enable “Allow handoff between this Mac and your iCloud devices.”
  • Mac with older macOS versions: About Apple logo -> System settings ... -> General Enable “Allow handoff between this Mac and your iCloud devices.”
  • iPhone or iPad: About Settings -> General -> AirPlay & Handoff activate the “Handoff” switch.
  • Apple Watch: In the Apple Watch app on iPhone via General Use the “Enable Handoff” option.

Source: Support document 102426

Conclusion on coreduetd: Helper process for cross-device functions

So if you're wondering what the coreduetd process actually does on the Apple Mac, then you now know. It manages certain synchronizations of storage and devices, especially for the handoff function. If all the prerequisites are activated, you don't have to laboriously exchange files between your own devices, send links back and forth, etc. - you can continue where you left off with just a tap or click without any additional effort. This is particularly helpful when changing devices spontaneously.

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In the Sir Apfelot Blog you will find advice, instructions and reviews on Apple products such as the iPhone, iPad, Apple Watch, AirPods, iMac, Mac Pro, Mac Mini and Mac Studio.