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It takes today's reference rate for your pair and tries chains of steps a person can do without paper — drop zeros, halve, divide by 4, add a tenth — and keeps the shortest chain that stays inside the error you allow. The badge "Runs ±x%" is how far the rule's answer sits from the exact one; a plus means the rule overshoots.

Three limits on the error: within 10%, within 3% and within 1%. A shorter rule is easier to say and runs further off. When two levels lead to the same rule, only one of them is offered.

A kept rule never changes by itself, so you do not have to relearn it every morning. When the rate has moved so far that the rule's error passes one and a half times its limit, the rule is marked Outdated and today's rule is shown beside it. Tap "Swap for today's rule" if you want the new one.

They are your own yardsticks: what a coffee, a lunch or a ticket costs you at home. On the Feel tab a foreign price is turned into your money and then compared with the yardstick — "1.3 × your home price". Three are needed before measuring starts, and after three measured prices in one currency the app shows how that country feels for you overall. Nothing is filled in for you.

There is no account. Kept rules, home prices and practice work with no network at all. Rates are fetched at most twice a day; without a connection the last fetched table is used, and a table also ships inside the app, shown with its date.

They are the European Central Bank's reference rates, republished by Frankfurter, for about thirty currencies. They are published once per working day. They are reference figures for rough sums, not the rate a bank or a card will give you.

Only occasional notes from us, such as news of a new version — never ads. The app asks before sending any. To switch them on or off later, use Settings → Notifications → Onehunch on your iPhone.

Pocket → gear → "Erase everything I entered" removes rules, home prices, measured prices and practice rounds. Deleting the app removes everything. To have a support message deleted from our mailbox, write to the address above.

Check Settings → Notifications → Onehunch and make sure they are allowed, and that Focus is not holding them back. We send them rarely, so a quiet week is normal.

Check the connection and tap "Fetch today's rates" in settings. On weekends and bank holidays there is no new table, so the date stays on the last working day. The app keeps working on the table it has.

Everything is stored only on the device and is removed with the app. There is no cloud copy to restore from. Pick your pair again and keep the rule; it takes a few seconds.

It will. The rule is a rough sum with a stated error, and your bank adds its own margin to a different rate. Use the rule to judge a price on the spot, not to check a statement.

That is deliberate: they are personal prices in one currency, not figures the app can recalculate. Write them down again in the new currency.