Underline vs Flashcards
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Underline
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Learning languages in 5 steps: 1. You download the app for free 2. We introduce you to the Underline world 3. You add your own flashcards or use our browser plugin 4. You remember words by practicing with one of our learning modes 5. You know the language you learn! Advantages of learning languages with Underline: • You receive flashcards for learning from us or you build your own unique base yourself using our browser add-on • You get access to suggested words based on the words you translate. • You choose the learning mode that suits you best: - viewing flashcards, - written translation of words, - typing words by ear, - quizzes (choice of answers) - mixed mode. • You listen to the vocabulary as it is pronounced, thanks to which you remember them faster • You use a handy translator that you can use as a source of new flashcards from your phone • You can choose from a system of intelligent repetitions or folders to organize the level of knowledge of your words • You set the frequency of learning (your goal) with reminders about it • You monitor the progress in your profile - thanks to this you know how your level of language proficiency is improving If… • You learn English from scratch • Are you looking for a perfect solution at work • Your technical or business language needs "upgrade" • You are preparing for your high school diploma or other exams • You are going to go abroad, but you prefer to expand your vocabulary beforehand • You have many friends from other countries that you want to chat with freely … Underline will be your best choice! In our application for learning English or another language, you can use the flashcards received from us or build your own unique database. That is why Underline is perfect for: • for beginners • for intermediate • for advanced By combining two compatible tools - a mobile application and a browser plug (extension), Underline combines the process of searching, translating, saving, and learning words, which allows you to learn the vocabulary you really need. In addition to English, we also have languages such as: • Spanish • Ukrainian • German • French • Japanese • Korean • Chinese and many others. Underline works best with our browser plugin, so if you want to learn a personalized vocabulary, feel free to download it! Our extension works for Chrome, Opera and Microsoft Edge:https://chrome.google.com/webstore/detail/underline/ogdfpjfkomoeoodbemmkloabcjkmmbol Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Flashcards
Expand your English vocabulary with a simple flashcard system. Create your own cards, choose from a library, or generate them from any text file. The app uses the Leitner System for spaced repetition and includes an XP system for motivation.
- Create custom flashcards
- Library of English words
- Generate flashcards from text files
- Spaced repetition (Leitner System)
- XP motivation system
- Automatic word translation
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Use this app if you really want to expand your daily English vocabulary. It's perfect for students, professionals, and language enthusiasts. My friend (K) and I (D) created this app for one reason: while we know a bit of English, we wanted a simple way to learn new words! --- - we’re having a beautiful September! Currently, the app offers: - we've created a set of flashcards for each level of experience, and everything is free. Just go to the shop and get a set that matches your skills. - you can add a new flashcard yourself or pick a word from our library. Translations are on us, and they’re free. - this is really cool: you can select any PDF file, text file, or pretty much any text, and we’ll create flashcards with examples for you. You definitely have to try it — it works like a charm! - if you add a word to your repeat list, we’ll notify you about upcoming repeats. Don’t worry about keeping track of the schedule. :) - The repeats are based on the Leitner System, so you’ll repeat each flashcard every few days. An XP system to keep us motivated as well! --- Lastly, here are the March stats from the app: 450 monthly active users (thank you!) 19,413 flashcards added by you 95 483 flashcards learned 15 minutes: average time spent in the app (crazy!) thanks D & K
Screenshots
Verdict
The clearest difference is ads: Underline at none against Flashcards's shown. Underline also leads on iOS requirement (10.0 vs 17.0). Flashcards's advantage is update cadence (weekly vs every 2 months). On price, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Underline ships an update every 2 months, Flashcards weekly. The most recent releases landed on September 9, 2026 and September 8, 2026 respectively.
| Parameter | Underline | Flashcards |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 10.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 40 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Damian Skoneczny | Daniel Budynski |
In-app purchases
Underline
No in-app purchases
Flashcards
No in-app purchases
Questions
Is Underline free?
Is Flashcards free?
Do Underline or Flashcards have ads?
Which is updated more often, Underline or Flashcards?
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