Language apps are one of the most accessible study tools ever: free to start, available anytime, and designed to fit into a five-minute break. However, one needs to be honest about its potential—because the promise of "fluency" appears in all the advertising and doesn't match what the tool delivers.
This text compares the five most used apps, explains what each one does differently, and includes the part that almost no list includes: the real level that can be achieved using only a cell phone, and what needs to be done beyond that.
What a language app actually delivers
It delivers vocabulary, structure recognition, reading comprehension, and listening practice in short sentences. It does this well with spaced repetition—the technique of reintroducing a word just before you forget it, which is the most efficient way to memorize it.
It doesn't deliver conversation. Speaking requires processing an idea in real time, with someone who responds unpredictably and sometimes doesn't understand you. No app replicates that, because the exercise of speaking in an app has expected responses, ample time, and no awkwardness—which is precisely what holds most people back in real life.
In practice, those who study diligently for months using an app usually reach a basic or pre-intermediate level: they understand simple text, can manage in predictable travel situations, and recognize a significant amount of vocabulary. This is a good and useful result. Fluency is something else entirely, and it comes from conversations with people, not from screen exercises.
The five most used, one by one.
Duolingo
The most popular in the world, with a game-like approach: points, daily streaks, and short lessons. It's the best on the list for creating habits, and habits are the most important factor in determining results when learning a language.
It covers dozens of languages, from the most common to the least spoken, and works on reading, writing, listening, and speaking in short sentences. The weak point is the grammatical explanation, which appears infrequently—those who like to understand the rules often find the method vague.
Babbel
It focuses on practical conversation and real-world vocabulary, with lessons structured by linguists. It is the closest to a traditional course among the five, with explicit grammatical explanations.
It offers courses in about fourteen languages and uses dialogues from everyday situations. Most of the content is paid, with a free sample available to try it out.
Rosetta Stone
Use immersion: it teaches without translation, associating image and sound directly with the word. The goal is to make you think in the language instead of mentally translating.
It has speech recognition to work on pronunciation. It's a method that greatly pleases those who adapt to it and frustrates those who prefer to understand the rules before applying them — it's worth trying the free sample before subscribing, because it's the most expensive on the list.
Memrise
It combines spaced repetition with short videos of native speakers in real-life situations. It's the best on the list for getting your ear used to accents and the natural speed of speech.
It works well as a complement: many people use Duolingo or Babbel for structure and Memrise for vocabulary and listening. The free version already offers plenty of content.
Busuu
It has a unique feature that none of the others on the list offer: exercises corrected by native speakers from the community. You write or record, and someone else provides feedback.
It's the closest thing to real-world practice within an app, although it depends on the goodwill of the person correcting it—responses can be slow and quality varies. It offers courses in about twelve languages, with a free plan and a paid plan.
What to do besides the app?
Three habits multiply the effect of studying with an app. The first is consumption: series, podcasts, and videos in the target language, starting with subtitles in the target language and not in Portuguese. The second is writing: keeping a five-line diary every day forces you to produce sentences, not just recognize them.
The third, and most important, is conversation with people. Language exchange groups, individual private lessons, or even a friend who speaks the language. It's the only way to move beyond the basic level, and no app can replace it.
From A1 to C2: where the app usually stops.
There is an international scale that describes language level using six levels, and it helps to put expectations in perspective because it speaks to what you... can do, It's not about how many words you've memorized, not how many words you've memorized.
- A1 and A2 — basic user. You introduce yourself, ask for simple information, and understand short, predictable phrases about everyday topics.
- B1 and B2 — independent user. You handle most travel and work situations, follow familiar topics, produce simple text, and argue your points with effort.
- C1 and C2 — proficient user. You understand long and implicit text, express yourself fluently, and use language in demanding academic or professional contexts.
Consistent study using an app usually gets you through to the end of A2 level and sustains reading and vocabulary at B1 level. From there upwards, the bottleneck shifts: it's no longer the quantity of words but the ability to produce under pressure, with someone waiting for your response. No screen-based exercise creates this pressure, because on a screen you have time, a visible alternative, and no audience.
One detail that helps to understand the situation: skills don't improve simultaneously. It's common for someone to read at a B1 level, understand audio at an A2 level, and speak at an A1 level. Knowing where your weaknesses lie is worth more than the total points the app displays.
Why the sequence of days is misleading
The streak of consecutive days is the most efficient retention tool ever invented — and retention is a business metric, not yours. The design is deliberate: notification at the time you usually open it, warning that the streak is about to break, easy exercise available to save the day in ninety seconds.
The problem is that the brain learns through discomfort. Practice only produces gains when it's slightly above what you've already mastered, and easy review exercises, repeated just to keep the flame alive, don't move anything. Many people accumulate hundreds of days and remain in the same place—and wrongly conclude that they have no talent for the language.
- Change the goal from "not wasting the day" to "making at least five mistakes today." Mistakes are a sign that you're at the right level.
- Skip the comfortable review and get to the drive you've been putting off.
- Turn off the sequence notification. If the habit is based on guilt, it will fall apart at the first unexpected event.
- Measure it by something else: how many sentences were you able to write without looking it up, how many minutes of audio did you understand without subtitles.
None of this detracts from gamification — it really does solve the problem of getting started. Just don't confuse the app's score with your level.
This app is not valid as a certificate.
This confusion costs time and sometimes money. The level displayed within the app is self-declared by the service itself: there is no panel, no human evaluation of speech and writing, and no external recognition. Universities, employers, and immigration agencies do not accept screenshots of completed learning paths.
When proof is required, the way to go is through a recognized proficiency exam, with tests of comprehension, reading, writing, and, in most cases, speaking. Each institution publishes which exams it accepts and what minimum score it requires—and this list changes from place to place, so check the source before paying for any exam.
What the app does well in this scenario is provide basic training: vocabulary, listening skills, and familiarity with the question format. What it doesn't do is replace specific preparation for the exam, which has a time limit, its own type of task, and published grading criteria.
Where does your money and attention go?
A free language app account can be closed in three ways, and all three affect what appears on your screen.
- Advertising. Advertising between lessons pays for the free version. The more short sessions you do, the more impressions the service sells — which explains the incentive to open it several times a day instead of studying all at once.
- Signature. Remove ads, unlock extra practice, and remove artificial daily error limits. The annual plan is usually charged all at once and renews automatically; note the date and remember that cancellation is done through the store where the purchase was made, not by uninstalling.
- License for schools and businesses. It's the recipe that the end user never sees, and it's a big one.
Add to that usage data: the time you study, session time, language of interest. None of this is state secret, but it makes up an audience profile that has commercial value. Before subscribing, test the real cost: use the free trial for two weeks and see if the barrier that bothers you is the service itself or your frequency. If it's the latter, paying won't solve it.
Other common questions
Which language should I choose first?
What will you use in something concrete in the coming months — work, a planned trip, content you consume? Abstract reasons like "it's beautiful" usually don't survive the third month, when the subject ceases to be new.
Can I study two languages at the same time?
It's possible, but at a cost. Time is divided, and progress is slower in both languages. If they are closely related, there's also interference: you start mixing vocabulary and structure. Taking it one at a time until you reach a solid basic level is the shortest path.
Can children use these apps?
Yes, with supervision and without it becoming a substitute teacher. Check the age rating, if there are advertisements, and if the service requires registration with a minimum age. For young children, the greatest benefit comes from listening and repeating aloud with someone, not from getting the answer right alone.
Do I need to study grammar separately?
It's very helpful to have a reference grammar book to consult when a rule isn't clear. Apps teach by default and repetition, and this leaves predictable gaps in verb tenses and prepositions—which are exactly the points that hinder writing.
I stopped for months. Starting over from scratch?
No. Passive vocabulary returns quickly, and in a few sessions you'll be back to your previous level. The common mistake is restarting the path from the beginning for the sake of discipline: skip to where it still hurts and only use review where you fail.
Is an app with a video teacher the same thing?
No, it's a different category — there you pay per hour of class with a person, with real-time correction. It's usually the natural next step for those who already have a foundation but freeze up when it comes to speaking.
Frequently Asked Questions
What is the best app for learning a language?
It depends on your profile. Duolingo is best for creating a habit; Babbel, for those who want grammatical explanations; Memrise, for listening and vocabulary; Busuu, for receiving corrections from native speakers; Rosetta Stone, for those who adapt to the immersion method.
Are they free?
Duolingo, Memrise, and Busuu have usable free versions. Babbel and Rosetta Stone are mostly paid, with a trial version available. Start with the free version and only pay after you've confirmed that the method suits you.
Is it possible to become fluent using only an app?
No. It's possible to reach a solid basic or pre-intermediate level, with good vocabulary and reading comprehension. Fluency depends on conversation with people, and that happens outside the app.
Can I use more than one at the same time?
It can, and usually does, work well. The most common combination is one app for structure and another for vocabulary and listening.
How much time per day?
Fifteen to twenty minutes a day yields more than two hours once a week. Language learning depends on frequency, not on long, spaced-out sessions.
Conclusion
The five apps on this list are good at what they set out to do: build vocabulary, train listening skills, and keep you studying. Use one of them as a base, choose the method that suits you best, and try the free version before subscribing.
And treat the app for what it is — the easy, consistent part of studying. The part that leads to fluency remains talking to people, making mistakes in front of others, and persisting anyway.
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