<h3>What does it do?</h3>
This plugin does nothing else than to use the internal export function of ACF to filter the data from your main page. After that all fieldgroups of your subpage will be deleted and re-imported. So it’s more of a hack than a real sync.
This has the consequence that the ID integer of your posts shoots pretty in height with frequent use. But that doesn’t really matter I think.

Advanced Custom Fields: Multisite Sync

Sync your Advanced Custom Fields to all of your multisite installations with just one click. Needs ACF Pro 5.0+

Hiroshi Sekiguchi

PRESSMAN

kazunao

Shotaro Muraoka

kengotakeuchi

hommakoharu

This plugin enables you to add hint text in ACF field in addition to the default description.
You can choose how to display your hint text from two types. One shows the button to toggle the display of the hint text and the other is the icon, which shows help text when the pointer is over it.
This plugin requires Advanced Custom Fields plugin.

ACF Additional Hint

This plugin enables you to add hint text in ACF field.

Advanced Custom Fields: Multisite Sync vs ACF Additional Hint