Questions, corrections
and product support.

Contact availability

The designated address for questions, corrections, product support and privacy requests is [email protected]. Email forwarding is verified.

Report a software correction

Include the page title, the statement you believe needs updating and an official source URL. Prices, plan limits and features can change after the verification date.

Workbook support

For toolkit support, email the address above and include your purchase reference. Support details are also included with the download and purchase receipt. Do not send payment-card details or customer data. We do not make a response-time promise.

Privacy requests

Calculator inputs stay in your browser and cannot be retrieved by us. Third-party vendor and checkout accounts must be managed with those providers.