Other than the already mentioned points, the old Sync Pro and Sync Dev didn’t include the ad libraries in the app. Sync Dev was on beta track by default IIRC and had an internal test group like the current 100 limited users testing group Sync for Lemmy has.

Settings shortcut: Comments > Show colorful comment indents

If draft was saved, it can be accessed by tapping the folder icon (by default the 3rd icon) below comment box.

Sync for Reddit - Sync Ultra

Sync for Lemmy - Sync Ultra

‘Remove ads’ is ₹2000 ($24.17) in India.

Sync for Reddit also had regional pricing just like that.

Did Boost developer reveal pricing for Boost for Lemmy? It is still showing the pre-registering page for me.