Comparison

effectLang vs Underline

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

Head to head
About

effectLang

Master new languages with an effective, free system. Create custom flashcards with images and audio, and utilize spaced repetition for optimal memorization. Learn at your own pace, even offline, with a fun, game-like approach to vocabulary building.

Highlights
  • Custom flashcard creator
  • Spaced repetition algorithm
  • Image and audio integration
  • Offline learning capability
  • Excel import/export
  • Text-to-speech pronunciation
Features
Read full description

Learn different languages in the most effective way for free! A simple and straightforward system will help you practice new languages effectively. You can use spaced repetition algorithm for memorization or just learn and practice at your own pace, even daily! A flexible "card creator" system, the use of modern learning strategies, and ease of use are not all the benefits of the app. A unique flashcard maker application lets you do things that weren't possible before. Your studying process will change thanks to the app. What are the main features of effectLang? - Integration with photo providers to instantly find a photo for your own flashcards, ability to add your pictures from your device if you want to. - Ability to add your own audio file or just use device built-in text to speech (TTS) technology for pronunciation (available languages are dependent on your device). Improve your English pronunciation (or any other language you are learning). - Provide an additional example, hint, or description for each flashcard. - Learn any language you want - English, Spanish, Portuguese German, Dutch, Hebrew, Italian, Russian, Polish, Korean, Japanese and many others. - Import and export flashcards content using Excel files. Flashcards and spaced repetition study app can work offline - without the internet (wi-fi is not required), but additional features, like downloading photos, can be used only online. Choose a study cards strategy, you only need to add new words, phrases, and sentences. Learn vocabulary and practice different languages with easy flashcards and modern active recall (active learning) strategies - image learning, spaced repetition & index cards. The whole learning process is like a fun memory game, you don't need to use boring dictionaries. Works for everyone - students, teachers, adults and beginners. Learning can be simple and fun! Doesn't matter if you want to travel, become a language expert or just get a glance at different languages, become a language learner today! Privacy policy: https://dawidwnukowski.com/dawid-wnukowski-mobile-games-privacy-policy/ Terms of service: https://dawidwnukowski.com/flashcards-terms/

About

Underline

Features
Read full description

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/

Screenshots

effectLang4 screens
Underline4 screens

Verdict

The call

The clearest difference is in-app purchases: Underline at none against effectLang's 2. Underline also leads on ads (none vs shown) and iOS requirement (10.0 vs 16.0). effectLang's advantage is update cadence (every 3 weeks vs every 2 months). On price 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. effectLang sells 2 in-app purchases, starting at $3.49 per month. Underline asks for nothing beyond the download.

UpkeepUpdate frequency

effectLang ships an update every 3 weeks, Underline every 2 months. The most recent releases landed on June 24, 2026 and September 9, 2026 respectively.

Scorecard4 real differences · 6 level
effectLang versus Underline: the parameters behind the verdict, then further details
ParametereffectLangUnderline
PriceFreeFree
Rating4.7 (7 ratings) — better
Positive reviews0.0% of reviews
Number of ratings7 — better
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases
DevicesiPhoneiPhone, iPod — better
Requires iOS16.010.0 — better
Further details — not scored
Size93 MB40 MB
Age rating12+4+
DeveloperDawid WnukowskiDamian Skoneczny

In-app purchases

2 purchases

effectLang

Subscriptions2
  • Premium3 Days trial$3.491 Month
  • Premium3 Days trial$21.491 Year
None

Underline

No in-app purchases

Questions

Is effectLang free?
effectLang is free to download, with in-app purchases available.
Is Underline free?
Underline is free to download, with no in-app purchases.
Do effectLang or Underline have ads?
effectLang shows ads; Underline does not.
Which is updated more often, effectLang or Underline?
effectLang ships an update every 3 weeks, and Underline every 2 months. Most recently, effectLang was updated on June 24, 2026 and Underline on September 9, 2026.

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