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Support

Last updated: November 14, 2026

Need a hand with LangTune (the Chrome extension or the Android app)? Start with the answers below. If you do not find yours, write to help@langtune.app and we will reply as soon as we can.

Signing in

LangTune uses Sign in with Google. Open any YouTube watch page, click the LangTune panel and choose Sign in with Google. We never see your Google password.

  • The sign-in window closes or shows an error. Allow pop-ups for the sign-in window, make sure you are online and try again. If it still fails, reinstall the extension and sign in again.
  • The panel says I need to sign in again. Your session may have expired. Use Log out in the account section of the panel and sign in again; your saved words and checkpoints stay on your account.
  • I use more than one Google account. Choose the one you want in the Google account picker. Use the same account in the extension and in the app to see the same data.

Loops and checkpoints

  • How do I loop a section? In the panel, set a start and an end (click the time to use the current moment of the video) and press Save checkpoint, then press play on the checkpoint. The moment repeats the number of times you choose.
  • The panel does not show up. LangTune only runs on YouTube watch pages (youtube.com/watch). Reload the page and check that the extension is enabled in chrome://extensions.

Captions and flashcards

  • The captions do not appear. Turn on Closed captions in the panel. They need captions or a transcript to exist for the video; not every video has them.
  • The captions are in a different language. When a video's captions cannot be read directly, LangTune uses YouTube's transcript for it, which follows your YouTube language setting. Choose the language you want in the transcript panel and reload the page.
  • How do I save a word? Select a word or phrase in the LangTune captions and press Add flashcard. It is saved with the moment of the video it came from.

Study time and sync

  • When does my time count? Only while a video is really playing (or while you review flashcards). It is sent to your account in the background every few minutes and when you leave the page.
  • My data does not appear in the app. Check that you are signed in with the same Google account in both, then pull down on the app's screen to sync.
  • Counting is off. You can turn Count my study time off in the account section of the panel at any time.

Delete your account and data

Email help@langtune.app from the address you sign in with and ask us to delete your account. We remove your flashcards, checkpoints, video history and study time within 30 days. The details are in the Privacy Policy. You can also revoke LangTune's access to your Google account any time at myaccount.google.com/permissions.

Contact us

help@langtune.app. To help us answer faster, tell us: whether you use the extension or the app, its version (shown in the panel or in the app's menu), your browser or phone, and what happened.

LangTune is an independent product and is not affiliated with YouTube or Google.