One little capybara. Two people looking after it.
Feed it, play with it, brush it. Either of you can do anything — nobody gets stuck waiting on the other.
A note, a snack, a tiny hat. They find it next time they open the app.
Every day you both show up, it grows a little. Miss one — that's fine. We don't keep score.
Your capybara can't get sick, can't run away, and can never die. Busy week? It'll be a bit sleepy, and that's all. This is meant to be the nicest thirty seconds of your day, not one more thing to feel bad about.
Something you both touch every day, even when you can't touch each other.
Nothing happens live. Do your bit whenever; they'll see it when they wake up.
Long-distance friends, siblings, a parent and a kid at college. Any two people.