Privacy policy

Effective October 11, 2026. This policy covers the Stairwright app and these support pages, operated by Purple Whale.

Inside the app

Calculations run on your device. The app saves the plans you name and your starting values (stock width, tread thickness, upper floor depth, nosing) on your iPhone so you can return to them. It does not send them to the developer, and it runs no analytics or advertising service. It has no account system and does not request your location.

Landings is a one-time in-app purchase. Apple handles the payment; the developer does not receive your payment details. To show whether Landings is unlocked, the app asks the App Store on your device. This is the only network use inside the app.

You can delete a saved plan by swiping it in the Saved list. The app has no cloud sync of its own. Device backups are managed by your operating system and backup settings.

When you open these pages

The Support and Privacy links open web pages. Vercel hosts this site and processes connection information, including IP addresses, to deliver and protect it. Vercel describes its processing in its privacy notice.

These pages contain no analytics scripts or advertising.

If you use the contact form

Contact us (in the app under ? > Questions) opens a Google Form in your browser. The form asks for your email address, your message and, if you choose, your iPhone model and iOS version. Google hosts the form, and we use your answers only to reply to you and look into the problem you report. Nothing is sent unless you submit the form. Google describes its processing in the Google Privacy Policy.

If you email support

Sending an email shares your email address and your message with the support operator. Mail providers also process that correspondence. We use it to answer your request and look into reported problems, and not for advertising.

We delete support messages from our active mailbox within 90 days after the last reply. Mail-provider backups may remain until the provider's retention period ends.

For questions about this policy, or to get a copy of a support message you sent, or to have it deleted, email yuugou.purple@gmail.com.