Support

Something not working, or just a question? Write to us — a real person reads every message.

Reporting a bug

Include these details and we can usually fix it far faster:

• Your device model and Android version (e.g. Pixel 8, Android 15).
• The App version, from the Play Store listing.
• What you did, what you expected, and what happened instead.
• A screenshot or screen recording, if you can.
• The email address on your account, if the problem is account-related.

The App does not send us crash reports automatically, so a bug we are not told about is a bug we do not know exists. Your email really is how we find out.

Common questions

How do I sign in? I don't have a password.

There is no password. The App offers Sign in with Google, or Continue as a guest if you would rather not attach an account. If you cannot get past the Google sign-in step, that is Google's account recovery, not ours — but tell us anyway and we will help you work out which it is.

My progress disappeared after reinstalling.

Progress is tied to your account. If you signed in with Google, sign in with the same Google account and everything comes back.

If you played as a guest, the account is tied to an identifier stored on the device, and uninstalling the App destroys it — a reinstall starts a fresh guest account and the old progress cannot be recovered. If you want progress that survives a reinstall or a new phone, sign in with Google.

The AI tutor said my sentence was wrong when it was right.

That happens. The tutor is a language model and it prefixes a suggested rewrite to most replies, including when your sentence was already correct. The App hides the suggestion when it is only repeating what you wrote, but the model still sometimes "corrects" perfectly good English. Treat it as practice, not as a ruling.

The chat says I have sent too many messages.

The AI chat has an hourly limit per account, because each message costs us money to answer. Wait an hour and it resets. Everything else in the App keeps working meanwhile.

Do my chat messages go anywhere else?

Yes — the text you send is passed to a third-party AI provider to generate the reply, without your name, email, or user ID attached. Please do not type anything sensitive into it. See The AI practice chat.

Is the App paid?

No. There are no paid features, no subscriptions, and no advertising.

How do I delete my account?

In the App: tap your name at the top of the Home screen, scroll to the bottom of Account, tap Xoá tài khoản, then type DELETE and confirm. It happens immediately and cannot be undone.

If you cannot open the App, email us instead. Both paths, and the full list of what is removed, are in Deleting your account.

How do I get a copy of my data?

Email us from your registered address and we will send you a machine-readable export within 30 days. See Your rights.

I found an error in a lesson.

Please tell us — include the lesson name and what is wrong. Corrections to content are genuinely useful and we act on them.

I want to report a security issue.

Email studio.anhtuanit@gmail.com with the subject Security report. Please give us a reasonable window to fix the issue before disclosing it publicly. We will not pursue legal action against good-faith security research.

Legal documents

• Privacy Policy — what data we collect and what we do with it.
• Terms of Service — the rules for using the App.
• Deleting your account — how to remove your data.