Comparison

DuoCards vs Flashside

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DuoCards

Master a new language with interactive flashcards and video courses. This app helps you build vocabulary, guess words, and track your progress across over 50 languages. Learn effectively through spaced repetition and integrated translation tools.

Highlights
  • Flashcard learning with spaced repetition
  • Video language courses with interactive subtitles
  • Integrated translator for over 50 languages
  • Vocabulary builder and progress tracker
  • Guess words and phrases to sharpen skills
  • Read foreign language articles
Features
Read full 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

About

Flashside

Create, study, and master any subject with this free flashcard application. It offers offline access, custom deck creation, and smart review features to enhance learning and retention for students and lifelong learners.

Highlights
  • Create custom flashcards
  • Study offline
  • Smart review modes
  • Multi-subject support
  • 100% free, no ads or subscriptions
Features
Read full description

Flashside is the flashcard app that plans your learning for you. Make cards for anything — vocabulary, kanji, anatomy, exam questions — and spaced repetition brings each one back at the moment you are about to forget it: after minutes while it is new, then days, then weeks. A few focused minutes a day beat hours of cramming. YOUR PLAN FROM ONE NUMBER Tell Flashside the minutes you have a day and, if you have one, the exam date. It sets the pace, says plainly whether the date is within reach, and every grade button shows when the card will come back. Free for everyone. EXAM PREPARATION • Exam mode: in the last weeks before the date, the deck is drilled until it holds • Quizzes from your own cards, written by hand or generated by AI; the result keeps your answer beside the right one • A memory chart for every collection: how much you would recall today, the last 30 days, and where it goes if you stop • Start a collection over for the next exam without losing its history PERSONALISED LEARNING AI A coach that plans your days, fixes the cards you keep failing and quizzes you before the exam — it never answers for you. • New words come back after a few minutes, and the pause adapts to how well they stick for you • Card doctor: when a card will not stick, it suggests better ways to write it. You pick the fix, or none • A coach card every Monday with what to change this week, and why you missed a card you were sure of • Reminders that move to the hour you actually study Remembering stays your job, because that is the part that makes you learn. EVERYTHING ON YOUR DEVICE Your cards, collections and progress live on your phone. Study on a plane, in the subway, off the grid — no account, no connection, no waiting. Sign in with one tap when you want sync, sharing or the web app at flashside.app, never before. CARDS THE WAY YOU THINK • Rich text, colours, images and audio on both sides, read aloud on request • Flip the direction, shuffle, hold the card to take back an answer • Import ready-made decks from CSV or Excel, paste a list with your own separators, or photograph a page (Plus) • Share whole collections with classmates and friends • Search every card and study from the one you found EARN IT Every session ends on a reward screen: your score, last time's, your streak, and now and then a badge sweeping in. Dozens of badges are hiding in Flashside — for showing up, flawless sessions, mastered collections and a few things you will have to discover. MAKE IT YOURS • Five colour themes, each in light and dark • Clean, fast, distraction-free design • Available in 18 languages LEARNING STAYS FREE Writing and studying cards, the plan, the memory chart, exam mode, syncing and sharing are free, and your cards always belong to you. Flashside Plus is an optional subscription for extras that cost us money to run: natural read-aloud voices, translation, quizzes, the card doctor, importing from a picture and the coach's explanations. Each one is clearly marked, and nothing is charged without your consent. Whether you are learning a language, prepping for med school, collecting kanji or just tired of forgetting names — start with one card today. Your future self will thank you at review time. Terms of Use (EULA): https://flashside.app/eula Privacy Policy: https://flashside.app/privacy-policy

Screenshots

DuoCards4 screens
Flashside4 screens

Verdict

The call

The clearest difference is review sentiment: Flashside at 100% against DuoCards's 63%. Flashside also leads on in-app purchases (none vs 11) and ads (none vs shown). DuoCards's advantage is ratings volume (1.4K vs 2) and iOS requirement (13.0 vs 18.6). On price, update cadence and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. DuoCards sells 10 in-app purchases, starting at $19.99 per month. Flashside asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Flashside holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: DuoCards has 1.4K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 63% of DuoCards's written reviews are positive against 100% of Flashside's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly monthly. Both last shipped on October 24, 2026.

Scorecard7 real differences · 3 level
DuoCards versus Flashside: the parameters behind the verdict, then further details
ParameterDuoCardsFlashside
PriceFreeFree
Rating4.7 (1.4K ratings)5.0 (2 ratings) — better
Positive reviews63.1% of reviews100.0% of reviews — better
Number of ratings1.4K — better2
Update frequencyMonthlyMonthly
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better18.6
Further details — not scored
Size19 MB63 MB
Age rating4+4+
DeveloperDuoCards s.r.oCQUELLE GmbH

Customer experience

DuoCards

All ratings1,340 ratings
Positive93.4%
Neutral2.5%
Negative4.2%
Written reviews594 reviews
Positive63.1%
Neutral10.4%
Negative26.4%

Flashside

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

DuoCards

Reported bugs

4 issues
  • App freezes and crashes
  • Issues with logging in and accessing content
  • Inconsistent behavior when adding new words
  • Problems with video playback and subtitles

Requested features

4 requests
  • Offline mode
  • More customization options
  • Improved spaced repetition system
  • Better integration with other language learning tools

Flashside

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

DuoCards

Subscriptions10
  • DuoCards Premium2 variants$19.991 Month
  • DuoCards Plus$33.003 Months
  • DuoCards Premium$34.993 Months
Show 7 more
  • DuoCards Premium$49.991 Year
  • DuoCards Premium7 Days trial$64.901 Year
  • DuoCards Premium7 Days trial$67.991 Year
  • DuoCards Premium1 Year trial$107.991 Year
  • DuoCards Premium7 Days trial$109.001 Year
  • DuoCards Premium7 Days trial$113.991 Year
  • DuoCards Premium1 Year trial$162.991 Year
None

Flashside

No in-app purchases

Questions

Is DuoCards free?
DuoCards is free to download, with in-app purchases available.
Is Flashside free?
Flashside is free to download, with no in-app purchases.
Which has better reviews, DuoCards or Flashside?
Flashside is rated higher. DuoCards averages 4.7 out of 5 from 1.4K ratings, while Flashside averages 5.0 from 2 ratings.
Do DuoCards or Flashside have ads?
DuoCards shows ads; Flashside does not.
Which is updated more often, DuoCards or Flashside?
DuoCards ships an update monthly, and Flashside monthly. Most recently, DuoCards was updated on October 24, 2026 and Flashside on October 24, 2026.

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