Comparison

DuoCards vs Fastlingo

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

Fastlingo

Learn languages through a structured progression of 10,000 carefully-graded sentences, each with concise grammar notes. This app offers a calm, consistent learning experience designed to prevent burnout and build confidence from beginner to intermediate levels.

Highlights
  • 10,000 graded sentences
  • Concise grammar notes
  • Continuous progression
  • Micro-learning design
  • Four languages available
  • Pronunciation practice
  • Voice recording and recognition
Features
Read full description

Fastlingo is built for calm, consistent progress. Instead of random phrases or grammar dumps, you learn through 10,000 carefully-graded sentences—each with a clear, concise grammar note. Every step adds just a bit more, so you keep moving without burnout, from A1 beginner to B2. Why Fastlingo works Continuous progression: Sentences are ordered so each one builds on the last—no jumps, no gaps. Micro-learning design: Small chunks of information that never overwhelm. Grammar that clicks: One focused explanation per sentence to make patterns stick. Largest organized set: 10k sentences curated for smooth, predictable growth. Four languages: German, Spanish, French, and English. How you’ll learn Start with very simple sentences. Read the brief grammar tip attached to each. Advance as you feel ready—each new sentence adds one manageable idea. Reach B2 with confidence built step by step. Perfect for self-learners who want structure without stress. • Learn Naturally: Build your speaking skills with real-life sentences. • Practical Grammar: Understand grammar in context, not as abstract theory. • Step-by-Step: Find your own pace and learn in a relaxed way. • Boost Retention: Key grammar concepts and vocabulary are repeated to ensure you retain them. • Modern method: Use the practice mode to make your learning more efficient. • Pronunciation: Record your own voice and compare it to the recording of the teacher or the text-to-speech voice. Also use voice recognition to test and improve your pronunciation. Terms of use (EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

DuoCards4 screens
Fastlingo4 screens

Verdict

The call

The clearest difference is ratings volume: DuoCards at 1.4K against Fastlingo's 1. DuoCards also leads on iOS requirement (13.0 vs 15.0). Fastlingo's advantage is rating (5.0 vs 4.7). On price, update cadence, ads and in-app purchases 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 and Fastlingo sells 1 in-app purchase, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Fastlingo 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 1, so its average is the more settled of the two.

UpkeepUpdate frequency

DuoCards ships an update monthly, Fastlingo every 4 weeks. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

Scorecard3 real differences · 7 level
DuoCards versus Fastlingo: the parameters behind the verdict, then further details
ParameterDuoCardsFastlingo
PriceFreeFree
Rating4.7 (1.4K ratings)5.0 (1 ratings) — better
Positive reviews63.1% of reviews—
Number of ratings1.4K — better1
Update frequencyMonthlyEvery 4 weeks — better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size19 MB38 MB
Age rating4+4+
DeveloperDuoCards s.r.oMihai Ionescu

Customer experience

DuoCards

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

Fastlingo

All ratings1 ratings
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

Fastlingo

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
1 purchases

Fastlingo

Subscriptions1
  • Renewable monthly subscription$3.991 Month

Questions

Is DuoCards free?
DuoCards is free to download, with in-app purchases available.
Is Fastlingo free?
Fastlingo is free to download, with in-app purchases available.
Which has better reviews, DuoCards or Fastlingo?
Fastlingo is rated higher. DuoCards averages 4.7 out of 5 from 1.4K ratings, while Fastlingo averages 5.0 from 1 ratings.
Do DuoCards or Fastlingo have ads?
Both DuoCards and Fastlingo show ads.
Which is updated more often, DuoCards or Fastlingo?
DuoCards ships an update monthly, and Fastlingo every 4 weeks. Most recently, DuoCards was updated on October 27, 2026 and Fastlingo on October 28, 2026.

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