FAQ and Support

Account and data

Q. Do I need an account?

A. No. You can use the App anonymously on each device, and your progress is saved automatically.

Q. What happens to my data when I change devices?

A. Progress is stored mainly on the device. A Premium subscription can be moved to a new device with "Restore purchases" (the same App Store or Google Play account is required).

Q. How do I delete my data?

A. Go to Settings and choose "Delete learning data". See Data Deletion for details.

Billing and Premium

Q. What can I use for free?

A. The free plan includes AI grading 5 times per day (video and text combined), 10 saved phrases, one theme course plus grammar courses, and AI character conversation 10 times per day. Joining the ranking and changing your name are also free. Premium includes all courses, AI grading 100 times per day, AI conversation (AI tutor and characters combined) 100 times per day, character voices, casual and formal model answers, and SRS.

Q. Is there a free trial?

A. No. You can try the main features on the free plan.

Q. How do I cancel?

A. Cancel in your App Store or Google Play subscription settings.

Q. How do I restore a purchase?

A. Tap "Restore purchases" on the Premium screen.

Learning and AI grading

Q. How accurate is AI grading?

A. AI grading is for reference. There can be several correct expressions, so please also check the model answers.

Q. Can I answer by voice?

A. Yes. With microphone permission, the App recognizes the English you speak and uses it for grading.

Notifications

Q. How do I change or stop reminders?

A. Go to Settings, then Notification settings, to change the time or turn them off.

Contact

For other questions, email thunderstruckworks@gmail.com. We usually reply within a few business days.