effectLang vs Underline
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Custom flashcard creator
- Spaced repetition algorithm
- Image and audio integration
- Offline learning capability
- Excel import/export
- Text-to-speech pronunciation
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Build a vocabulary collection that means something to you. With effectLang, you create your own flashcards from the words and phrases you meet in class, at work or while traveling. Add context, pictures and sound, then practice with scheduled reviews. Your words, your flashcards Create decks for the subjects you want to study. Add an example sentence, a hint or a description to each card. Use tags to organize your vocabulary and choose what to practice. See and hear what you learn Attach your own photos or search for an image in the app. Record your voice or attach an audio file. You can also listen to text-to-speech pronunciation when a suitable voice is available on your device. Supported voices and their quality depend on your device and language. Know when to return Rate your answers to schedule the next review. The home screen highlights a deck with cards due for review, or shows your next scheduled date. After a completed session, see how many cards you practiced and what comes next. Optional review reminders require notification permission; delivery timing depends on your device. Study saved cards offline Your flashcards and progress are stored on your device. You can practice saved cards without an internet connection. Image search, purchases and downloading language resources require internet access. The interface is available in English, Polish and Spanish, independently of the languages on your cards. Free access and Premium The free version allows up to 2 decks with 40 flashcards per deck, plus up to 3 photo additions and 3 audio additions per day. Optional Premium removes these deck, card and daily media limits. Monthly and yearly subscriptions renew automatically unless canceled. Available plans, local prices and billing terms are shown in the app and in the store before purchase. Manage or cancel your subscription in your store account settings. Privacy policy: https://dawidwnukowski.com/apps-privacy-policy/ Terms of use: https://dawidwnukowski.com/flashcards-terms/
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/
Screenshots
Verdict
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 4 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
Both are free to download. effectLang sells 2 in-app purchases, starting at $3.49 per month. Underline asks for nothing beyond the download.
effectLang ships an update every 4 weeks, Underline every 2 months. The most recent releases landed on October 12, 2026 and October 11, 2026 respectively.
| Parameter | effectLang | Underline |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 4 weeks — better | Every 2 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 16.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 112 MB | 40 MB |
| Age rating | 12+ | 4+ |
| Developer | Dawid Wnukowski | Damian Skoneczny |
In-app purchases
effectLang
- Premium3 Days trial$3.491 Month
- Premium3 Days trial$21.491 Year
Underline
No in-app purchases









