Privacy policy

Who this covers

This policy covers Compound Interest & Mortgage and the StackxLab apps website, operated by StackxLab. For privacy questions, email stackx.sg@gmail.com.

Calculator inputs

The app processes amounts, rates, age and other calculator inputs on your device. It does not send these inputs to StackxLab or a bank. Inputs are held in memory for the current app session and are not backed up to a cloud account.

The interactive preview on this website also calculates in your browser. It does not send calculator inputs to us.

Advertising

Ad-supported versions use Google AdMob to display banner ads. Google may process IP addresses (including approximate location), device identifiers, ad interactions and diagnostic information to deliver ads, measure performance and prevent fraud. We request non-personalised ads; this does not mean that no data is processed.

Where required, the app asks for privacy choices before requesting ads. You can revisit available choices through Guide → Ad privacy choices. If privacy settings or ads cannot load, you can still use the calculators. We do not send your calculator inputs to Google.

See Google’s Privacy Policy and Google’s Mobile Ads data disclosure. Earlier versions with advertising disabled do not request banner ads.

Purchases

Remove Ads is an optional one-time purchase processed by Apple. The app checks Apple’s transaction and ownership information to enable ad removal, restore purchases and reflect refunds. StackxLab does not receive your payment-card details. Once a purchase is verified, the app stops requesting banner ads. After reinstalling, use Restore purchases with the Apple Account used to buy.

See Apple’s Privacy Policy. We do not operate a user-account service or connect to your bank.

Support emails

If you email us, we receive your email address, message and any attachments you choose to send. We use them to answer your request and resolve app issues. Our support mailbox is hosted by Gmail, which processes messages to provide its email service.

We keep support messages while needed to handle your request and follow-up, or to meet legal obligations. You can ask us to delete your support correspondence, subject to those obligations. Please do not send passwords, bank account details or other sensitive information.

Website hosting

This website does not use advertising trackers, analytics scripts or tracking cookies. Our hosting infrastructure may process technical request information, such as IP address, browser information and request time, to deliver and secure the website.

Apple and other external services have their own privacy policies when you follow links to their websites.

Your choices

You can use the calculators without contacting us or creating an account. To ask about information you have sent us, request a correction or request deletion, email stackx.sg@gmail.com.

Changes to this policy

We will update this page when our data practices change and revise the date above.