Comparison

DuoCards vs Polyglot Video Player

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

Polyglot Video Player

This app allows you to watch videos with two subtitle tracks displayed simultaneously. It's ideal for language learners to compare translations and original text in real-time, or for multilingual families to enjoy content together.

Highlights
  • Simultaneous dual subtitles
  • Language learning accelerator
  • Customizable subtitle display
  • Wide format support
  • Smooth playback
Features
Read full description

Unlock a new dimension of video viewing and language learning with Polyglot Video Player. Have you ever watched a foreign film and wished you could see both the original language captions and a translation in your native tongue at the exact same time? Standard video players limit you to just one subtitle track, forcing you to choose between understanding the plot or studying the language structure. Polyglot Video Player solves this problem once and for all iOS devices. Our app is designed with a singular, powerful purpose: to display two different subtitle tracks simultaneously on the same screen. This makes it the ultimate tool for serious language learners and polyglots in training. Imagine watching anime, K-dramas, or international cinema with your native language subtitles at the bottom and the target language script at the top. You can instantly compare sentence structures, idioms, and vocabulary in real-time, drastically accelerating your comprehension without constantly pausing to check a dictionary. It is not just for students, either. Polyglot Video Player is perfect for multilingual households wishing to enjoy movies together, ensuring everyone understands the dialogue regardless of their primary language. Key Features: Simultaneous Dual Subtitles: The core feature you need. Load and display two separate subtitle files at once on any video. Language Learning Accelerator: The most efficient way to compare translations versus original audio side-by-side on the screen. Customizable Display: Don't let text block the action. Easily adjust the size, color, and vertical position of each subtitle track independently to suit your preference. Wide Format Support: Compatible with most popular local video formats and standard subtitle file types (such as .SRT). Smooth Playback: A clean, user-friendly interface designed for a seamless viewing experience on phones and tablets. Stop compromising on your video experience. Break down communication barriers and master new languages faster. Download Polyglot Video Player today and watch the world in double vision!

Screenshots

DuoCards4 screens
Polyglot Video Player4 screens

Verdict

The call

The clearest difference is in-app purchases: Polyglot Video Player at none against DuoCards's 11. Polyglot Video Player also leads on ads (none vs shown) and rating (5.0 vs 4.7). DuoCards's advantage is ratings volume (1.5K vs 1) and iOS requirement (13.0 vs 15.1). 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. Polyglot Video Player asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Polyglot Video Player holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: DuoCards has 1.5K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

DuoCards ships an update monthly, Polyglot Video Player every 2 months. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.

Scorecard6 real differences · 4 level
DuoCards versus Polyglot Video Player: the parameters behind the verdict, then further details
ParameterDuoCardsPolyglot Video Player
PriceFreeFree
Rating4.7 (1.5K ratings)5.0 (1 ratings) — better
Positive reviews63.1% of reviews—
Number of ratings1.5K — better1
Update frequencyMonthly — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.1
Further details — not scored
Size19 MB19 MB
Age rating4+4+
DeveloperDuoCards s.r.oSabrina Aridi

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

Polyglot Video Player

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

Polyglot Video Player

No in-app purchases

Questions

Is DuoCards free?
DuoCards is free to download, with in-app purchases available.
Is Polyglot Video Player free?
Polyglot Video Player is free to download, with no in-app purchases.
Which has better reviews, DuoCards or Polyglot Video Player?
Polyglot Video Player is rated higher. DuoCards averages 4.7 out of 5 from 1.5K ratings, while Polyglot Video Player averages 5.0 from 1 ratings.
Do DuoCards or Polyglot Video Player have ads?
DuoCards shows ads; Polyglot Video Player does not.
Which is updated more often, DuoCards or Polyglot Video Player?
DuoCards ships an update monthly, and Polyglot Video Player every 2 months. Most recently, DuoCards was updated on November 3, 2026 and Polyglot Video Player on October 28, 2026.

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