How can we help?

Sign in with Google or Apple. Your progress, XP, streak and certificate are saved to your account, so they follow you to a new phone when you sign in with the same account.

If sign-in fails, check your connection, update the app to the latest version and try again. Still stuck? Email us with your phone model and app version.

A lesson counts as complete when you read to the end of its last topic. The next lesson opens when the one before it is complete, and the next chapter when the previous chapter's lessons are done.

Your streak counts the days you meet your daily goal, in your own time zone. XP is awarded once per lesson, quiz and test, so repeating something doesn't add more.

Every TechStack Atlas app is free to start: the first chapters, their quizzes and tests, streaks and leaderboards. Premium unlocks every chapter, the final exam and certificate, offline access and no ads, as a monthly, yearly (7-day free trial) or lifetime plan. Prices are shown in the app store and vary by country.

Purchases are handled by the App Store or Google Play and belong to the app you bought them in. To manage or cancel a subscription, use your store account's subscription settings. On a new phone, sign in with the same account and use Restore purchases in the app.

Refunds are handled by Apple or Google under their store policies.

Pass a course's final exam to receive a certificate. It shows your name, the course, your score and a unique serial number that anyone can use to confirm it is genuine.

Leaderboards rank learners by XP, weekly and all time. To hide yourself, turn off Show me on leaderboards in your profile in the app. See the privacy policy for what we store and why.

You can delete your account from the app at any time. Read how account deletion works and what to do about an active subscription first.