Getting help.

Reporting a calculation problem

What to send.

A calculation report is only useful if it can be reproduced. Four things are usually enough.

The calculator and the mode

Which suite you were in, and which mode within it. Several suites work more than one form of the same problem.

Every value you entered

The full set of inputs, with units, exactly as typed. A single field read differently is the commonest cause of a figure that looks wrong.

The figure you expected

Your own answer, and the source it came from if there is one. A published worked example is the strongest report there is.

Device and app version

The version is shown in the app under Settings, in the About section, together with your device model and its operating system version.

Subscriptions

Buying, restoring and cancelling.

Restoring a purchase

Open the Pro screen in the app and choose Restore purchases. This recovers an active subscription on a new device, after reinstalling, or if Pro does not appear straight away. Use the same store account the subscription was bought with.

Managing or cancelling

Subscriptions are managed in your store account rather than in the app. On an iPhone, open the Settings app, tap your name, then Subscriptions. Cancelling stops the next renewal, and Pro stays available until the period you have paid for ends.

Refunds

Payment is taken by the store, not by the developer, so refunds are requested from the store. For an App Store purchase, use Apple's own report a problem page for your purchase history.

If Pro does not unlock

Try Restore purchases first, and check that the device is signed in to the store account that made the purchase. If it still does not appear, write in with your device model and the approximate date and time of the purchase.