608 Practice

Last updated: November 10, 2026

About This App

608 Practice is an independent study tool that helps HVAC technicians prepare for the EPA Section 608 certification exam. Practice questions are compiled from publicly available educational sources.

Information Collection and Use

The app does not ask for your name, email address or any account, and it does not require login or registration. It has no advertising and does not track you across other companies’ apps or websites.

To learn how the app is used and whether it helps people pass, the app sends anonymous usage data, described below. You can turn this off at any time in the app.

Anonymous Usage Data

While Share anonymous usage data is on (Settings › Privacy), the app sends events like these:

• That the app was opened, and the app version, language and exam sections you chose
• Which study modes you start and finish, how many questions you answered, how many were right, how many answers you chose to reveal, and how long the session took
• Mock exam scores, and whether each one passed
• When a section’s readiness changes, for example from Almost ready to Ready to pass
• Which screens and features you use, such as Weak spots

Events carry a random ID created for this installation of the app, so we can tell one installation’s sessions apart. It is not linked to your name, email address, device’s advertising ID or any account. Events never include the questions you answered, the answers you chose, or anything you type.

Location lookup is turned off, and PostHog is set to discard the IP address each event arrives from.

The events go to PostHog, our analytics service, which stores them in the United States on our behalf. They are not sold or shared with anyone else, and are not used for advertising.

To stop sending usage data, turn off Share anonymous usage data in Settings › Privacy. The app works the same either way. Usage data from the builds we test the app with is marked as test data and left out of our results.

Data Stored on Your Device

The app stores the following data on your device. Apart from the anonymous usage data above, it is not sent anywhere:

• Study progress and quiz scores
• Bookmarked questions
• Question mastery and analytics data
• Disclaimer acceptance status
• Cached practice questions and pressure-temperature (PT) chart data for offline use
• App settings, such as your language, mock exam timer, study reminders and the usage data switch

Study reminders are scheduled on your device. No server is involved in sending them.

If you export a backup, the app creates a file of your progress, and you choose where to save or share it. Backups are never sent to us.

You can delete all locally stored data at any time by uninstalling the app.

Internet Connection

The app connects to the internet to:

• Check for updated practice questions and PT chart data, which only downloads question and chart content
• Send anonymous usage data, while it is turned on

The app works fully offline if no connection is available.

Children’s Privacy

The app is an educational tool for HVAC technicians and is not directed at children. It does not knowingly collect personal information from anyone, including children under the age of 13. The app is rated 4+ (Everyone).

Third-Party Services

• Supabase delivers question and PT chart content. No user data is sent to Supabase.
• PostHog receives the anonymous usage data described above, while it is turned on.

Changes to This Privacy Policy

We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated "Last updated" date. We encourage you to review this page periodically.

By using our application, you agree to the terms outlined in this Privacy Policy.