<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+

psychopsia

You can see a overview of all field groups with the configuration of each field.
In <code>Options</code> column will include field properties that is not empty. 
If a field is created but is not found, <code>type</code> column will be marked in red.
This plugin requires ACF version 5 or above to work properly.
Repository:
https://github.com/nopticon/acf-overview/
Preview:
https://raw.githubusercontent.com/nopticon/acf-overview/master/doc/acf-overview.jpg
<h4>Compatibility</h4>
This ACF field type is compatible with: 
* ACF 5

ACF Overview

ACF Overview allows to quick view the configuration of all field groups

Advanced Custom Fields: Multisite Sync vs ACF Overview