What you need
- An iPhone each, both with Which Boob? 3.0.
- Each of you signed in to iCloud with your own Apple Account. iCloud has to be on for the app, which it is unless you've turned it off.
Invite your partner
- Open Which Boob? and tap the info button to open About.
- Under Sharing, tap Share with Your Partner.
- Send the invitation however you like, for example in Messages.
Join on your partner's iPhone
- Open the invitation on the iPhone that has Which Boob? installed.
- Once it's open, the About screen on that iPhone says whose feeds it's sharing.
What happens next
- You both see and add to the same feeds. New ones usually arrive within a few seconds.
- Feeds either of you logs on Apple Watch are shared too.
Good to know
- Your partner needs an iPhone, since sharing goes through iCloud.
- Only the people you invite can join. The share is never public.
- To stop, tap Manage Sharing on the About screen to remove your partner or stop sharing. If you joined someone else's feeds, tap Stop Sharing. You keep the feeds you already have.
- Erase All Feeds removes the feeds from every phone that shares them.
Checked against Which Boob? 3.0 on 8 November 2026. Something different on your iPhone? Let me know.