Comparison

Whale Notes vs DuoCards

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

Head to head
About

Whale Notes

Easily record new vocabulary words, their meanings, and example sentences. Sync notes across devices with cloud backup. Offers tools for word definition lookup to help you build a daily learning habit.

Highlights
  • Record new words and meanings
  • Add example sentences
  • Cloud backup and sync
  • Offline functionality
  • Word definition lookup
  • Daily learning habit tracker
Features
Read full description

- When you come across a new word while studying, just open Whale Notes and add a note with its meaning and an example sentence. - You can create an account or link a social media account to make sure all your notes are backed up to the cloud. This way, you won’t lose your notes if you delete the app or if your phone is lost or stolen. - Works smoothly both online and offline. - Available on multiple platforms, so you can sync your notes across different devices. - More tools to help you find word or phrase definitions. - Try to make this a daily habit, aiming to learn 3-5 new words each day. We hope this app helps you grow your vocabulary. Thank you for your support! Subscriptions in the app will be charged to your credit card through your iTunes account. The subscription will automatically renew unless canceled at least 24 hours before the end of the current period. Once activated, the subscription cannot be canceled. You can manage your subscriptions in Account Settings after purchase. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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

Screenshots

Whale Notes4 screens
DuoCards4 screens

Verdict

The call

The clearest difference is ads: Whale Notes at none against DuoCards's shown. DuoCards's advantage is update cadence (monthly vs every 5 months) and ratings volume (1.3K vs 34). On price, rating, in-app purchases and monetization model 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. Whale Notes sells 5 in-app purchases, starting at $2.99 per 3 months and DuoCards sells 10 in-app purchases, starting at $19.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Whale Notes against 4.7 for DuoCards. That said, the two scores are not equally well evidenced: DuoCards has 1.3K ratings behind it against 34, so its average is the more settled of the two. Written reviews are what separate them: 50% of Whale Notes's written reviews are positive against 63% of DuoCards's.

UpkeepUpdate frequency

Whale Notes ships an update every 5 months, DuoCards monthly. The most recent releases landed on June 1, 2026 and September 24, 2026 respectively.

Scorecard4 real differences · 6 level
Whale Notes versus DuoCards: the parameters behind the verdict, then further details
ParameterWhale NotesDuoCards
PriceFreeFree
Rating4.8 (34 ratings) — better4.7 (1.3K ratings)
Positive reviews50.0% of reviews63.3% of reviews — better
Number of ratings341.3K — better
Update frequencyEvery 5 monthsMonthly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size24 MB19 MB
Age rating4+4+
DeveloperThi VoDuoCards s.r.o

Customer experience

Whale Notes

All ratings35 ratings
Positive94.3%
Neutral2.9%
Negative2.9%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

DuoCards

All ratings1,340 ratings
Positive93.4%
Neutral2.5%
Negative4.2%
Written reviews592 reviews
Positive63.3%
Neutral10.5%
Negative26.2%

Bugs and requests

Whale Notes

Not enough reviews yet to summarise bugs or 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

In-app purchases

5 purchases

Whale Notes

Subscriptions3
  • Premium 3 months14 Days trial$2.993 Months
  • Premium 6 months14 Days trial$4.996 Months
  • Premium 12 months14 Days trial$8.991 Year
One-time2
  • 200 notes$1.99
  • 500 Notes$2.99
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

Questions

Is Whale Notes free?
Whale Notes is free to download, with in-app purchases available.
Is DuoCards free?
DuoCards is free to download, with in-app purchases available.
Which has better reviews, Whale Notes or DuoCards?
Whale Notes is rated higher. Whale Notes averages 4.8 out of 5 from 34 ratings, while DuoCards averages 4.7 from 1.3K ratings.
Do Whale Notes or DuoCards have ads?
DuoCards shows ads; Whale Notes does not.
Which is updated more often, Whale Notes or DuoCards?
Whale Notes ships an update every 5 months, and DuoCards monthly. Most recently, Whale Notes was updated on June 1, 2026 and DuoCards on September 24, 2026.

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