Something not working, or a question the app does not answer? Email rostami@outlook.com and you will get a reply from the person who wrote the app.
In Settings, tap the invite and read out the six-character code. Your partner enters it on their phone. The code is valid for an hour; make a new one if it expires. You keep separate phones and accounts, and one shared household.
Check that both phones are on the same household (Settings shows the household you are in) and that both have a working connection. Kesto works offline and syncs when the network returns, so a spend logged in a shop with no signal appears once that phone is back online.
Allow notifications on both phones: that is what refreshes the other person's Lock Screen widget the moment you log something. On iOS, add a Budget widget several times and long-press each to choose which budget it shows.
One purchase covers both partners: buy on either phone and the other gets it through your shared household, usually within a minute. Changed phone or reinstalled? Open Settings, then Kesto Plus, and tap Restore purchases. Cancelling is done in your App Store or Google Play account settings.
Settings has a CSV export and a complete JSON backup, free, whether or not you have Plus. The same screen has account deletion, which removes your account and your household's data. If a partner is still in the household, their data stays with them.
Uninstalled already? The delete your account page explains how to ask by email.