OmniFocus is a task and project manager from The Omni Group for Apple devices. It runs on Mac, iPhone, iPad, Apple Watch and Apple Vision Pro, and a web version is available in the browser. Tasks and projects sync across the user's devices, and the vendor offers a free sync server with end-to-end encryption. The app can be bought once or used by subscription.
The Omni Group is headquartered in Seattle, Washington, and describes itself as an employee-owned company, so no foreign parent company is named. As a US company it is subject to US law, including the CLOUD Act, wherever its data is stored. The vendor's pages do not state where sync data is hosted, and no GDPR statement or sub-processor list was found on the pages reviewed. A European organisation should ask the vendor directly where data is processed before relying on the sync service.