The app is not working. What can I do?

If you can’t enter the app or if it’s still loading, please check your internet connection first and try to turn off the app, and open it again. If it doesn’t help, contact our support service at info@duocards.com and share detailed information about your issue.

I can’t log in via Google. What can I do?

If you aren’t able to log in via Google, please, log in via email/password to avoid that. If you have been using Google login until now and don’t know the password, create a new one.

I lost my progress and I don’t see my content.

If you don’t see your cards after you log in, you are probably logged in under a different account. Please, make sure you use the same email address as before.

How can I change my password?

You can change your password through the login options on the admin page in the app. Write down your new password and click on “Update password”.

How do I report a bug?

When you find a bug, it is essential to report the bug for it to be fixed properly. Send an email including screenshots to info@duocards.com and our developers will take a look at it.

My microphone is not working. How can I fix it?

Check that you have these two apps installed and enabled (needed for voice recognition):


If not, please install/enable those and restart your phone.

How do I report a mistake in the translation?

When you encounter a wrong translation or a spelling mistake, feel free to suggest an edit directly in the app. We check the users’ revisions regularly and correct the mistakes.

The subtitles for a video are missing or wrong.

When you encounter missing or wrong subtitles, send a link of the video to: info@duocards.com.

The content is in a different language.

When you see a different language than the one you are currently learning in one of the sets or courses, or when the translation is in a different language than the one you chose to be your known language, suggest an edit directly in the app and feel free to report the set to: info@duocards.com.

How can I report an inappropriate content?

If the content seems inappropriate to you, feel free to report it to info@duocards.com and if possible, include some screenshots.

I invited a friend but didn’t get the premium.

You can get the premium version for free when you send your friends an invitation link to use the app. For each invited friend both of you will get one month of Premium for free. Your friend has to finish the registration and the tutorial. Please, make sure that your friend has installed the app before he clicked on the invitation link. The offer is valid even if the invited friend is already registered.

How does the Affiliate program work?

Recommend DuoCards on your platforms and get provisions. If you’re interested in this kind of collaboration, let us know at info@duocards.com and share some information about your content and audience. 

I want to promote your app.

Are you a teacher, linguist, or an influencer and would you like to help us by promoting DuoCards on your social media or among your students? Send an email to victoria@duocards.com and tell our pr specialist something about what you do and who your audience is. Send your media kit and links to your social media sites. 

I purchased the subscription but the premium version hasn’t been activated. What can I do?

If you paid for the Premium version but still can’t use all the features of the app, please check first, if you are under the correct account. If so, try clicking on the “restore purchase” button at the bottom of the subscription screen. If this doesn’t help, send a screenshot of the “subscription” screen in the app and the paid subscription in the App-store or Google Play at info@duocards.com, and we will solve it as soon as possible. 

How can I import my vocabulary into the app?

You can import your words just by copying them into DuoCards. Use Ctrl+C to copy your list of words and insert it in the first input when creating a new flashcard. The app will save the words one by one.

How can I sort cards into different folders?

When you add new cards or when you create your own cards, you can sort them into different folders. You can also sort your existing cards in the edition mode. 

How can I filter cards?

You can filter cards with the filter button directly in the learning mode. Choose a folder and the app will only show you the cards from that folder.

How can I create my own content?

You can either create new flashcards and save them directly to your deck, or you can create sets of cards. If you want to create a new flashcard, click on the “plus” button on the main screen. If you want to create a set, click on the “menu” button at the top-right corner in the library and choose “Create → Create a Set of Cards”.

How can I upload a video or an article?

If you want to upload a video or an article, click on the “menu” button at the top-right corner in the library and choose “Create → Publish Video/Create Article”. When you publish a video from YouTube, make sure it’s in the target language with captions.

Can I share content with others?

If you want to share a set with your friends or students, click on the three dots at the top-right corner in the set and choose “share”. Copy the link and share it with others.

How can I test myself from learned cards?

If you want to practice words that are already in the known and/or learned folder, you can use the filter feature and “include known cards”.

Are there other payment methods available?

At the moment there are no other payment methods available. We are preparing a payment gateway for the website which will be ready within a few months.

Is there an offline version of the app?

At the moment, we are working on an offline version of DuoCards. We definitely want to make it possible for users to learn offline and in the future, it will be possible.

How does the algorithm work?

The app uses a certain algorithm based on spaced repetition that supports the learning process. It’s a bit different than usual ones and the intervals go like this:

Before the longer offsets, there are more repetitions than standard spaced repetition software are using. Thanks to that you will learn the vocabulary more properly, from both sides and with listening tests.

What are the advantages of the Premium version?

With the Premium, there’s an unlimited amount of cards that you can save or create per day, and there are, of course, no ads disturbing you from learning. You can filter cards and choose what you want to learn.

How do I cancel my subscription?

If you want to cancel a subscription from Apple:

  1. Open the Settings app.
  2. Tap your name.
  3. Tap Subscriptions.
  4. Tap the subscription.
  5. Tap Cancel Subscription. You might need to scroll down to find the Cancel Subscription button.

If you want to cancel a subscription from Google:

  1. Open the Google Play app.
  2. At the top right, tap the profile icon.
  3. Tap Payments & subscriptions Subscriptions.
  4. Select the subscription or prepaid plan you want to cancel.
  5. Tap Cancel subscription.
  6. Follow the instructions.

How do I request a refund?

If you want to request a refund from Apple:

  1. Sign in to reportaproblem.apple.com.
  2. Tap or click “I’d like to,” then choose “Request a refund”.
  3. Choose the reason why you want a refund, then choose Next.
  4. Choose the app, then choose “Submit”. If you were charged for a subscription that you no longer want, you can also cancel the subscription.

If you want to request a refund from the Google Play Store:

  1. Go to the Play Store page of your purchased app and tap “Refund”.
  2. Click “Request refund” in the pop-up window.
  3. After confirming the refund, you’ll receive an email confirming that your refund request was processed and the funds will be refunded.

How does the Family subscription work?

With the Family Plan, up to six people can enjoy the DuoCards premium version on their devices. Each member has their own Premium account, and everyone keeps their own password and content. 

How do I upgrade my existing individual subscription to a Family subscription?

Go to the admin page in the app, click on “subscription” and upgrade to a Family plan.

How do I add members to my Family Plan?

Go to the admin page in the app, click on “subscription” and write down the registration email addresses of people you wish to add to your Family Plan. Please check that they installed DuoCards on their device first.