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DuoCards: Vocabulary Builder

DuoCards s.r.o · Education · United States store
NOT IN TOP 100 HERE
View on App Store ↗ Instagram card Google Play version →
Revenue a month, worldwide EST
$35.6K
Likely $11.9K to $106.8K
▲ >999% in 11 days
New ratings
Tracking
Daily counts start building from today
Rating
4.7 of 5
1.4K ratings in this store
Countries it ranks in
8
was 11 on Oct 15, 2026

Revenue

Estimated from the grossing charts of Oct 21, 2026 in the 53 countries we track, and ratings growth on the App Store.

EST. REVENUE / YEAR · WORLDWIDE
$427.1K
Both stores combined. Small app estimate, so no split per store
EST. LIFETIME DOWNLOADS
50.3K to 143.7K
Estimated from ratings count
WHERE IT EARNS · EST. / MONTH
  • Philippines #69 Education (Play)$10.4K · 29%
  • Czechia #17 Education (iOS), #97 apps (Play)$5.6K · 16%
  • Germany #41 Education (Play)$5.2K · 15%
  • Turkey #33 Education (Play)$2K · 6%
  • Vietnam #68 Education (Play)$1.1K · 3%
  • Netherlands #70 Education (Play)$990 · 3%
  • Ukraine #22 Education (iOS), #65 Education (Play)$902 · 3%
  • Belgium #69 Education (Play)$786 · 2%
29 more countries
  • Israel #67 Education (iOS), #68 Education (Play)$613 · 2%
  • Austria #81 Education (iOS), #71 Education (Play)$608 · 2%
  • Egypt #67 Education (Play)$571 · 2%
  • Denmark #62 Education (iOS), #69 Education (Play)$551 · 2%
  • Switzerland #71 Education (Play)$459 · 1%
  • Romania #69 Education (Play)$429 · 1%
  • Thailand #68 Education (Play)$415 · 1%
  • Kazakhstan #40 Education (iOS), #67 Education (Play)$414 · 1%
  • Norway #69 Education (Play)$402 · 1%
  • Poland #97 Education (iOS)$363 · 1%
  • Argentina #70 Education (Play)$363 · 1%
  • Saudi Arabia #68 Education (Play)$362 · 1%
  • Colombia #70 Education (Play)$340 · 1%
  • Hong Kong #66 Education (Play)$285 · 1%
  • Chile #70 Education (Play)$227 · 1%
  • Pakistan #66 Education (Play)$222 · 1%
  • Nigeria #66 Education (Play)$211 · 1%
  • UAE #67 Education (Play)$203 · 1%
  • Finland #69 Education (Play)$200 · 1%
  • Singapore #69 Education (Play)$197 · 1%
  • New Zealand #69 Education (Play)$175 · 0%
  • Greece #69 Education (Play)$170 · 0%
  • Portugal #70 Education (Play)$151 · 0%
  • Malaysia #68 Education (Play)$150 · 0%
  • Peru #70 Education (Play)$149 · 0%
  • Qatar #46 Education (iOS)$112 · 0%
  • Ireland #70 Education (Play)$90 · 0%
  • Bangladesh #66 Education (Play)$73 · 0%
  • South Africa #69 Education (Play)$63 · 0%
HOW SURE ARE WE
Small app: combines its grossing ranks with ratings growth (68 new ratings a month on average since launch). Tested on 418 apps with verified revenue: typically off by about 2.6 times, so the range is wide. Countries we don't track (and Google Play in China, which doesn't exist) aren't included, and neither are ads or web payments. Gross revenue before store fees.
RATINGS
1.4K
AVG RATING
4.71
PRICE
Free
AGE
6.5y
LAST UPDATE
54d ago
VERSION
1.20.17
SIZE
19 MB
AGE RATING
4+

Last 29 days

From our daily snapshots of every grossing chart.

DAYS IN A GROSSING CHART
27 / 29
COUNTRIES NOW
7 (was 1)
EST. REVENUE A MONTH, DAILY · BOTH STORES EST
Show daily values
Sep 24, 2026$170.7K a month
Sep 25, 2026$170.9K a month
Sep 26, 2026$238.2K a month
Sep 27, 2026$234.2K a month
Sep 28, 2026$331K a month
Sep 29, 2026$171.2K a month
Sep 30, 2026$23.1K a month
Oct 1, 2026$24K a month
Oct 2, 2026$23K a month
Oct 3, 2026$23K a month
Oct 4, 2026$21K a month
Oct 5, 2026$21.3K a month
Oct 6, 2026$21.1K a month
Oct 7, 2026$21.3K a month
Oct 8, 2026$21K a month
Oct 9, 2026$20.9K a month
Oct 10, 2026$21.5K a month
Oct 11, 2026$22.1K a month
Oct 12, 2026$22.1K a month
Oct 13, 2026$290.9K a month
Oct 14, 2026$309.8K a month
Oct 15, 2026$107.9K a month
Oct 16, 2026$129.3K a month
Oct 17, 2026$86.9K a month
Oct 18, 2026$33.4K a month
Oct 19, 2026$86.4K a month
Oct 20, 2026$91.4K a month
Oct 21, 2026$402K a month
Oct 22, 2026not in a grossing chart
The same estimate as the headline, saved every day. Best rank Sep 24, 2026: #74 Education · NL. Now: #15 Education · GR.

Money and momentum

Measured from the store, not estimated.

WHAT IT CHARGES
9 purchases listed
  • DuoCards Premium$109.00
  • DuoCards Premium$64.90
  • DuoCards Premium$107.99
  • DuoCards Premium$19.99
  • DuoCards Premium$113.99
  • DuoCards Plus$33.00
  • DuoCards Premium$67.99
  • DuoCards Premium$162.99
Top in-app purchases as listed on the App Store, in local prices.
REVIEW MOMENTUM
0.5 reviews / week
  • Trendrising
  • Recent reviews average3.6 stars
  • Recent 1 and 2 star share29%
From the latest 136 written reviews, covering 1900 days.
RELEASE CADENCE
1 update in 90 days
  • Typical gap between releases29 days
From the last 25 versions listed on the App Store.
RATING BREAKDOWN
1.4K ratings
5★85%
4★8%
3★2%
2★2%
1★3%

What users want

From the latest 136 reviews on the United States App Store, Aug 9, 2021 to Oct 12, 2026: 29% are 1 or 2 stars. Open a theme to read what people wrote.

WHAT THEY COMPLAIN ABOUT · SHARE OF BAD REVIEWS
Price and subscription35%

14 of the 1 and 2 star reviews.

★★★★★ I have no interest in signing up for yet another 7 day trial.
★★★★★ As a result, you might be paying for a premium subscription, but you still have to use ChatGPT to get comprehensive and understandable explanations.
★★★★★ If I paid more for this app I'd demand a refund.
Bugs, things not working23%

9 of the 1 and 2 star reviews.

★★★★★ Even though I'm a paid member on the iPhone app I always get a connection error unless I reload the app multiple times and it prevents me using it.
★★★★★ Beyond that, there are many small usability bugs that show this app isn't very important to its maker - they didn't fix something as simple as picking a language to study on the library page.
★★★★★ “text-speech unavailable for this language combination” is the error.
Login and account problems10%

4 of the 1 and 2 star reviews.

★★★★★ Allow me to at least try out a lesson or two without having to onboard or sign up for a trial.
★★★★★ I subscribed the app, but after couple days I can't use it, because I can't enter, the app always show - wrong e-mail or password.
★★★★★ But when I try to log into my Google account from the DuoCards iPad app, it says “Please use DuoCards app or a different browser,”but I am logging in from the app.
Wrong or poor results10%

4 of the 1 and 2 star reviews.

★★★★★ The AI tutor is almost completely useless.
★★★★★ I'm sorry but you presume too much, your analytics are obviously fake, and your intrusiveness is off the charts.
★★★★★ If it turns out I was wrong, I'll come back and admit it.
Crashes and freezes5%

2 of the 1 and 2 star reviews.

★★★★★ Too many directions so far stuck on take a nickname; is taken
★★★★★ Crashes when I try to open it, crashes when I do the listening exercise, I paid for a year subscription and after a week I can't access the filter, the app suddenly thinks I don't have a subscription even though it…
Limits, credits, locked features5%

2 of the 1 and 2 star reviews.

★★★★★ - limited information and structure - 3 blanks for text, no room for additional information like the rule to conjugate this verb.
★★★★★ I want to love this app but the trial is very limited and it's been very buggy on my ipad.
Slow, laggy, battery5%

2 of the 1 and 2 star reviews.

★★★★★ This slow burn learning - from music, video, library conversation clubs - helps you feel the song of the language vs learning rules of language - targets procedural memory vs declarative memory.
No customer support5%

2 of the 1 and 2 star reviews.

★★★★★ I assumed when I purchased this app that it would have rich peer support for its sibling product Duolingo - it has basically none.
★★★★★ If my suspicion is correct, I'm surprised that App Store support allowed such an app to be listed.
WHAT THEY ASK FOR
  • It would be great if users could turn this option on in the settings. 4★, Aug 17, 2026
  • I wish i never downloaded it. 1★, Jun 28, 2026
  • I do wish it had a SLOW mode along with a pronunciation key….I need all the help I can get! 5★, May 11, 2026
  • It lets you add the phrases that you want to learn. 5★, Oct 30, 2024
  • It should have way more. 5★, Feb 25, 2024
  • Your CEO must need a hefty bonus. 5★, Jan 23, 2024
  • I only wish it had a feature to immidietly mark something as “Learned” 4★, Jan 16, 2024
  • I filled out one set of “cards”, and could not not find any way to add more vocabulary. 2★, Dec 20, 2023
WORDS THAT KEEP COMING UP IN BAD REVIEWS
connection problem3flash card3
WHAT THEY LOVE · SHARE OF GOOD REVIEWS
Useful, it helps20%

17 of the 4 and 5 star reviews.

★★★★★ Great app and useful features
★★★★★ Creating your own flash cards is so helpful.
★★★★★ Helps out a lot to learn new and old vocabulary so then you don't forget what you learned.
Easy to use14%

12 of the 4 and 5 star reviews.

★★★★★ Already has sets but super easy to add my own words!
★★★★★ I've tried others, but it's easy for them to go too fast and make you feel overwhelmed.
★★★★★ this app is simple yet it never runs out of content or fun — bravo, you couldn't have done better!
Worth the money8%

7 of the 4 and 5 star reviews.

★★★★★ After using it for its basic, free flashcards language learning function, I decided to upgrade to the paid version.
★★★★★ I bought the premium, i think it is worth it so far.
★★★★★ I love the interface and how you can make your own flash cards all for free.
Fun, addictive8%

7 of the 4 and 5 star reviews.

★★★★★ I hope you had fun with me too.💗
★★★★★ this app helped me to study all the vocab i needed to know for my french class in a satisfying and fun way, and helped me improve my skills even outside what we were learning.
★★★★★ I am enjoying the ease of use of using this to review words in the Thai language.
Fast4%

3 of the 4 and 5 star reviews.

★★★★★ I've tried others, but it's easy for them to go too fast and make you feel overwhelmed.
★★★★★ The ability to use native materials with instant translation and save flash cards from that video are brilliant, this is my favourite language app I've come across and highly recommend.
★★★★★ I am a fast learner and duolingo was messing with me cz they would repeat same sentences that ive already learnt 1000 times

Found by matching words and phrases in the reviews, not read by a person. A review can count toward more than one theme.

What users say

Latest reviews, United States App Store.

★★★★★Oct 12, 2026
First day

Too many directions so far stuck on take a nickname; is taken

★★★★★Sep 10, 2026
Forced onboarding /trial

Update: Rediscovered this, updated it, and now it’s even worse. No lifetime option, monthly charges in perpetuity…no thanks. That is definitely not an improvement. Also the flash cards do not take advantage of my larger iPad screen size. There is no reason to have such a small font when there is so much real estate available to really take advantage of the screen. I have no interest in signing up for yet another 7 day trial. Allow me to at least try out a lesson or two without having to onboard or sign up for a trial. Especially for a product with a high subscription. ZERO interest in jumping through these hoops, so I will be deleting.

★★★★★Aug 18, 2026
Великолепно!

Пользуюсь 2 года. Очень доволен!

★★★★★Aug 17, 2026
We need this option

Hi! I really love using Duocards to learn vocabulary with flashcards. I’d really love to have an option to automatically play the example sentence when I flip a flashcard. Right now, I can hear the word, but hearing the example sentence automatically would help me remember the word much better. It would be great if users could turn this option on in the settings. Thank you!

★★★★★Aug 6, 2026
best app for me to study words

я попробовал очень много способов как учить иностранные слова, но только в этом приложении у меня получилось РЕАЛЬНО выучить больше 1050 слов/фраз на английском и больше 600 на итальянском (учил в 2025, запоминал реально быстро и эффективно) Конечно если сюда не заходить, то весь словарь забывается, но это проблемы нашего мозга, а не этого милого мамонтёнка. всем мир

★★★★★Aug 5, 2026
Ai tutor is silly

The AI tutor is almost completely useless. It always responds with short answers, and no matter what you ask it, it basically says the same thing. You ask it to explain the etymology of a word or phrase, and it just gives you the meaning instead, simply rephrasing it. If you ask it to explain some complex language concepts, it again responds with short phrases that don't mean much. As a result, you might be paying for a premium subscription, but you still have to use ChatGPT to get comprehensive and understandable explanations. I am very disappointed with this app. While many other features work well, this particular aspect has left me frustrated.

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Store screenshots

ScreenshotScreenshotScreenshotScreenshotScreenshotScreenshotScreenshotScreenshotScreenshotScreenshot

App Store ads

Apple Search Ads this app ran in the last 90 days, from Apple's public ad repository.

STATUS
Running now
FIRST SEEN
Jan 21, 2026
AD VARIATIONS
61
EU COUNTRIES
16
WHERE
Search results in AT, BE, CZ, DE, DK, ES, FI, FR, GR, IT, NL, PL, PT, RO, SE, SK. Formats: Icon Ad, Icon + Asset Ad. Last impression Oct 17, 2026.
AD TEXT
  • Vocabulary Builder with AI
  • Vokabeltrainer mit KI
  • Lernen mit Videos und Artikeln
  • Speak & Learn a new language
  • Flashcards et vocabulaire
  • Améliorer les langues
Ad creativeAd creativeAd creativeAd creativeAd creativeAd creative

Apple only publishes ads shown in the EU (EU Digital Services Act), with a 7 day delay. An app that advertises only outside the EU shows nothing here.

Growth research

Where this app is buying and earning its users. Each link opens pre filtered.

Meta Ad Library ↗Active Facebook and Instagram adsTikTok Creative Center ↗Top performing TikTok adsTikTok creators ↗Organic videos mentioning the appInstagram ↗Reels and posts under its hashtagYouTube ↗Reviews, tutorials and ShortsDeveloper site ↗Landing page and pricing

ASO keywords

Most repeated terms in the listing. Highlighted ones also appear in the title.

duocards6build vocabulary3save words3vocabulary3save3words3build2real2videos2articles2decks2remember2flashcards2conversations2review2learn2personal2html2

What's new in 1.20.17

AI Roleplay - Practice real-world conversations in simulated scenarios AI Stories - Interactive stories with comprehension exercises Bookmarks - Save your current progress in an article for later Transliteration - Read Chinese, Arabic, Japanese scripts easily Auto Dark Mode - Study comfortably day or night Smarter Translations - Context-aware translations AI Grammar Feedback - Accurate corrections with explanations

Released Apr 15, 2020. Current version shipped Aug 29, 2026.

Store description

Build vocabulary from the real content you already enjoy. DuoCards helps you save new words from videos, articles, shared decks, and your own notes, then remember them with smart flashcards and spaced repetition. Why learners choose DuoCards: - Save words and phrases from videos, subtitles, and articles - Practice with an AI tutor for real-life conversations - Improve pronunciation with instant feedback - Review vocabulary with flashcards that adapt to your progress - Learn English, Spanish, French, German, Japanese, Korean, and 50+ languages - Use ready-made courses, public decks, or your own personal word lists Learn in a simple loop: 1. Discover useful words in context 2. Save them to your personal deck 3. Review, speak, listen, and remember Whether you are learning for travel, school, work, or everyday conversations, DuoCards gives you a flexible way to build vocabulary and keep it in memory. Download DuoCards and start building your language habit today. Terms of use: https://www.duocards.com/termsofuse.html Privacy policy: https://www.duocards.com/privacypolicy.html

See this store page in another country

Prices, ranks and reviews are per country. Revenue above is already worldwide.

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