Sharpen! Support

Tap Get Full Access on the login screen. The app opens the external registration page, where you can create or upgrade an account before returning to sign in.

Check that your email and password are correct, that your internet connection is working, and that the account is not disabled. The login screen also shows a helpful error message when Firebase Authentication rejects the sign-in.

Open Forgot password? on the login screen or use the reset link in the top menu after you are signed in. The app sends a Firebase password reset email to the address you provide.

The app can show a disabled or locked account when Firebase reports a disabled user or when the single-device session is blocked by an administrator or security check. Contact support if you believe this happened by mistake.

Registered accounts use single-device binding. The app stores a device identifier locally and compares it with the Firestore session record to help prevent account sharing and unauthorized access.

If you still have access to the old device, sign out there first. Then sign in on the new device. If the session is still locked or the old device is lost, contact support so the device binding can be reviewed.

Free Trial uses anonymous authentication and a limited guest trial state. Trial access may only be available for topics that are marked eligible in the backend content.

The guest trial can end when the allowed attempts are used, when the current topic is no longer eligible, or when app storage is cleared. Trial state is stored both on the device and in Firestore.

Core is the starting level. Advanced unlocks after you score at least 80 percent on that topic, or when the progress record already shows a higher completed level.

The score is calculated as correct answers divided by total quiz questions, then shown as a percentage. A score of 80 percent or higher can unlock Advanced for that topic.

Advanced remains locked until you have enough progress on Core for that topic. Guest users can only use the trial-eligible flow that the backend allows.

The selected topic or difficulty may not have questions yet, or the topic may still be under development. Try another subject or contact support if the content should already be available.

Check your internet connection, refresh the app, and try again. Loading screens are often waiting on Firestore content or auth state to finish resolving.

The quiz uses a per-question timer that counts down in the browser or app runtime. If it looks frozen, reload the page or restart the app and check whether another app restriction or background state interrupted it.

Question images come from the content stored in Firestore or linked media URLs. A weak connection or a broken content link can prevent them from showing.

Progress and performance history are saved for registered users after quiz submission. Guest sessions do not save permanent history. If you were signed out, switched devices, or lost your connection, the record may not have synced.