Privacy policy
Last updated 13 September 2026
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.
Accounts, ads and purchases
The current app does not include sign-in, advertising, analytics, in-app purchases or bank connections. If these features are introduced, we will update this policy to describe the services used and the information they process before releasing that version.
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.