Apple, Google, or email.
The day is tied to the account you choose, not to a single phone.
Sign in once. The timeline, plan, and memory follow the account across iPhone and the browser.
Example You add the prescription pickup on the web at your desk, then check it off on iPhone on the train home.
The day is tied to the account you choose, not to a single phone.
Updates travel with the account so a change on one screen can show on another.
Apple Health, widgets, and Live Activity stay on iPhone. The day itself does not.
Life Tracker
Free on iPhone. The same account opens on the web.