Buying it twice is a synchronisation problem
Living with other people produces the opposite failure to running out: two of you buy the same thing.
The cause is simple. "We're nearly out of detergent" exists only inside one person's head. One of you notices and buys some. The same day, so does someone else. Both acted correctly, and now there are two bottles of detergent.
Try to fix it with a whiteboard on the fridge and you hit a different wall: only whoever is at home can update it. What you bought while out doesn't show up until you get back.
Share the stock, not just the shopping list
Most households share a shopping list, but a shared list alone doesn't fully prevent double buying — there is a lag before "I bought it" removes the item.
What you want to share is the thing underneath: the stock itself. When stock is shared:
- The moment someone restocks, the count goes up and the item disappears from everyone's shopping list
- "Nobody has bought this yet" is visible to everyone
- What is in the house, and how much, can be checked from outside the house
Family sharing in ZaikoPilot
Up to five people share stock, the shopping list and restock history in real time.
How to invite someone:
- Settings → Family, and create an invite link
- Send it to your family however you like
- When they open the link and register an account, stock is shared from that moment
The person you invite needs an account (a guest can't join a family). This is so changes to shared stock can be attributed to whoever made them.
What is shared:
| Item | Shared | Notes |
|---|---|---|
| Stock list and days remaining | Yes | Everyone sees the same numbers |
| Shopping list | Yes | One person restocks, it clears for all |
| Restocking | Yes | Who restocked, and when |
| Notification settings | No | Everyone chooses their own |
Notifications are deliberately personal. Daily alerts for everyone would be noise for anyone who isn't the one going to the shops. The person who does the shopping can get daily notifications while everyone else gets critical alerts only.
Making it work day to day
Whoever buys it restocks on the spot
Ideally you open the app as you leave the till. Wait until you're home and there's still a window where someone else heads out for the same thing.
Reset the pace for the size of your household
Settings carried over from living alone won't match. A family of four gets through toilet paper roughly four times faster. Watch the real rate for a month or two and adjust.
Put one person in charge of adding items
Only new items need a single owner. It stops the same thing being added twice under slightly different names.
What it costs
Family sharing itself is free. The free plan caps you at ten items.
If even one person in the family is a PRO user, the whole family gets unlimited items. A household of four doesn't need four subscriptions — one is enough.
In short
- Double buying happens because stock lives in individual heads
- Share stock, not just a list, and restocking reaches everyone instantly
- Notification settings stay personal, so only the shopper gets the daily nudge
- One PRO user lifts the item limit for the whole family