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If you find this HIIT Timer helpful and would like to support its development, please consider making a small donation. Your support helps keep this app free, ad-free, and continuously improving!
Click below to donate via PayPal:
Every donation, no matter how small, is greatly appreciated!
Install HIIT Timer on your phone for the best experience! It works like a regular app - no app store needed!
Make sure you're viewing this page in Safari (not Chrome or other browsers)
Look at the bottom of the screen (iPhone) or top (iPad)
Scroll down in the menu that appears
You can change the name if you want, then tap "Add" in the top right
Find the ⚡ HIIT Timer icon on your home screen and tap it to open!
You might see a banner at the bottom of the screen saying "Add HIIT Timer to Home screen"
If no prompt appears, tap the three dots (⋮) in the top right corner
The exact wording depends on your browser
Confirm by tapping the "Install" button
Find the ⚡ HIIT Timer icon in your app drawer and tap it to open!
In the address bar, look for a small icon (⊕ or 💻)
Click "Install" in the popup that appears
The app will open in its own window. Find it in your applications or start menu!
You can always use the app in your browser without installing. It works great either way! Just bookmark this page for easy access.
Search YouTube for "How to add website to home screen" + your phone type
Example: "How to add website to home screen iPhone"
This HIIT Timer app is designed with your privacy as a top priority. We do not collect, transmit, or store any personal data on external servers.
All app data, including your workout history and preferences, is stored locally on your device using browser Local Storage. This data:
This app is a Progressive Web App (PWA) that works completely offline after the initial load. No internet connection is required to use any features, and no data is ever transmitted to external servers.
The only external service integrated is PayPal for optional donations. The donation button links to PayPal's secure payment page. We do not collect or process any payment information directly.
This app may request the following browser permissions:
You have complete control over your data:
This app's source code can be inspected to verify our privacy claims. There are no hidden data collection mechanisms or tracking scripts.
Any changes to this privacy policy will be reflected in this page. As this app operates entirely offline, we cannot notify you of changes, but we commit to maintaining the same privacy-first approach.
If you have questions about this privacy policy, you can find contact information through the app's repository or donation page.
Last Updated: January 1, 2026