Tandem Tiles runs on Apple's iCloud sharing, so there's no account to recover and no password to reset. Most questions turn out to be about the waiting, which is the part that's meant to feel different. Here are the short answers.
From the invite screen in the app, send them an Apple share link — by message, mail, or however you like. They open it on their iPhone and they're in. Neither of you creates an account.
Then the day stays face down, which is the point. Yours is safely on the board and they can add theirs whenever they get to it — an hour from now or tomorrow morning. It opens for both of you the moment the second photo lands.
Nothing breaks. There's no streak to lose and nothing scolds you. The day simply stays unopened until you both add to it.
No. The board is shared with exactly one person — whoever accepted your invitation — through Apple's iCloud sharing. There's no public feed, no discovery, and no way for a stranger to find it. The developer runs no servers and cannot see your photos.
Not today. Tandem Tiles is iPhone only, on iOS 17 and later. It's built directly on Apple's iCloud sharing, so an Android version would mean building the sharing layer over again from scratch.
Anything else — including bugs, which are genuinely useful to hear about — write to tjones7306@gmail.com. If you're on the TestFlight beta, sending feedback from inside TestFlight attaches your device details automatically, which helps a lot.