Do reviews with your friends!!
In Anki, go to Tools → Study Together → Export my due cards... and save due-cards.json to your Desktop.
Rename your file with your name (e.g. john.json) so you can tell them apart.
Send your file to everyone else via iMessage, email, etc.
Save everyone else’s files to your computer.
Go to Tools → Study Together → Import partners’ files and build deck...
Select everyone else’s files (not your own). Hold ⌘ to pick several.
If there are 3 or more of you, it asks for a number. This is the number of people that you want to have the same cards. For example, if you have a group of 3 and put down 2, it will collect all the reviews that at least 2 of you have. Or you can put down 3, and it will only pull cards that all 3 of you have.
A deck called Study Together appears. Open it and start reviewing. Everyone’s cards are in the same order, so you can go through them together on a call.
Reviewing in Study Together counts toward your normal scheduling.
If it says “No cards meet that threshold,” you likely don’t share any due cards, or you aren’t all using the same shared deck.