Built a two-player app as a solo developer (turns out that's a specific kind of chaotic)

PettyPoints is a scorekeeping app for couples and roommates - you log grievances, the other person can dispute them, and if you can't agree, three friends vote blind via a browser link to settle it. Whoever wins can send their partner a AI-written roast of their week's crimes.

The weird part of building it solo: almost every other app I've made only needs one person to actually use it and like it. This one doesn't work unless two people buy in - one person can't really experience the product alone. That's forced some decisions I wouldn't have made otherwise (no subscription, ever - one person buys, the other plays free, because charging both people to argue with each other felt insane).

Curious what's been the trickiest part of your own two-sided products, if you've built any — the growth loop, the pricing, or just getting the first pair of users to actually play together?

Launching soon - will post here when it's live.