The best flashcard app for language learning is the one that decides when each word comes back, lets you put in your own cards, plays the word aloud, and is quick enough that you open it every day. Those four things matter more than the size of the built-in word lists, and they matter more than how polished the lessons look. A flashcard app doesn't teach you a language. It keeps the vocabulary you've already met from draining away.
We're the team that builds Flips, a flashcard app based on the forgetting curve and spaced repetition, so we're not neutral here. What we can offer is the list of checks we used when we decided what to build, plus a few ways to set up a deck for Spanish, French, and Japanese. If you want a ranked roundup of named apps, we wrote one for memorization apps in general. This article is narrower: what a language learner should look for, and how to run a deck once you've picked one.
What a flashcard app can and can't do for a language
Languages are mostly a memory problem with a skill problem on top. You need thousands of words and phrases available on demand, and you need to be able to use them in a sentence. Flashcards attack the first half. They are very good at it, because every card forces you to produce the answer instead of recognizing it, which is the part of vocabulary study that actually builds recall.
They are not a course. A card won't walk you through how the subjunctive works, and it won't hold a conversation with you. Most people who stick with a language end up using a flashcard app alongside something else: a class, a textbook, a tutor, graded reading, or plain listening. That's a good reason to choose a flashcard app on how well it handles memory, and to stop expecting it to be everything.
Flips brings each card back right before you're likely to forget it, and you can build your own decks or import from CSV/TSV. Free to start.
See FlipsSix checks before you commit to one
The table is the short version. The sections after it explain the three checks that trip people up most: scheduling, your own cards, and audio.
| Check | Why a learner cares | Flips |
|---|---|---|
| Spaced repetition | Words come back as they fade, so you don't re-read the ones you know. | Yes, built on the forgetting curve |
| Your own cards | The words from your class, your show, your trip, not a generic top-1000. | Create decks; import CSV/TSV |
| Pronunciation audio | You learn the sound with the spelling, not just a silent word. | Text-to-speech; languages depend on your device |
| Active recall | You produce or choose the answer; you don't just look at it. | Swipe cards or 4-choice questions |
| Several languages | Spanish for work, Japanese for fun: no second app. | One deck per language, any language |
| Daily friction | If it takes five taps to start, you'll skip days. | Opens and starts right away; reminders; streak calendar |
Scheduling is the check that decides everything else
Two apps can have the same cards and give you very different results, because one of them shows you everything in the same order every day and the other decides what's due. With a few hundred words the difference is small. With a couple of thousand it's the whole game: you can't re-read two thousand words a day, so without scheduling you either skip most of them or stop.
The usual shape of a good schedule is that a word you got right comes back after a longer gap each time, and a word you missed comes back soon. A rough hand-made version is 1, 3, 7, 14, and 30 days after you first learn a word. That's a common rule of thumb, not an exact rule. If you want to see what such a ladder looks like against your own calendar, the review schedule calculator takes a start date and your intervals and lists the review dates. Give it your deck size and how many new cards you add per day, and it also tells you how many days it takes to get through all of them.
In Flips the app handles the timing. Mastered cards space out and shaky ones come back sooner, so on a given day you answer what's due and nothing else. The deck list shows a forgetting gauge for each card, which tells you at a glance which words are at risk. We built it that way because a learner shouldn't need a spreadsheet to know what to study today.
Your own cards beat a bigger built-in list
Ready-made vocabulary decks are a fine way to start, and Flips has some. But the words that stick are the ones you ran into: the menu item you couldn't read, the phrase your coworker keeps using, the word from last night's episode. A deck made of your own encounters is smaller than a generic frequency list and much more likely to come up again in your life, which is the best review there is.
So check how painful it is to add a card, and whether you can bring in a list you already have. In Flips you can create a deck by hand, or import a CSV or TSV file. If your teacher posts a vocabulary sheet, or you keep your own spreadsheet with the word in column one and the meaning in column two, export it as CSV and import it instead of retyping. You can also attach an image to the front or back of a card, and add a note on the back, which helps for words that are easier to remember as a picture than as a translation.
Audio: check your language, not just the feature
A silent flashcard teaches spelling. Pronunciation has to come from somewhere, and for most learners the quickest source is text-to-speech on the card. Flips reads cards aloud with TTS, and which languages are supported depends on your device and the voices installed on it. Before you commit a month to a deck, open one card in your target language and listen. If the voice for your language isn't there, you'll want another source of audio for that language, which is a limit of the device and not something we can hide.
Flips
Spaced-repetition flashcards for vocabulary in any language. Swipe or pick from four choices, hear words read aloud, and see which cards are about to fade. Free to start.
Learn more about FlipsHow to run a language deck: three setups
Whatever app you pick, the habits below do more than the app does. They're written for Flips because that's what we know, but nothing in them depends on a particular feature except the review scheduling.
Spanish, from a class or a travel plan. Group the cards by situation instead of one long list: a deck for ordering food, one for getting around, one for the words your teacher assigned this week. Put the Spanish on the front and the English on the back for the first pass, then add a second set of cards with them reversed for the words you most need to produce, like la cuenta, por favor. A full sentence on a card works better than an isolated word when the sentence is short and you'd actually say it. Keep new cards to a number you'll finish on your worst day.
French, where the gender belongs on the card. Learn every noun with its article, so the front is table and the back is la table, not just table. Gender is far easier to attach to a word at the start than to patch on later. Verbs are better as short phrases than as a bare infinitive: je vais carries more than aller alone. And because French spelling and pronunciation are so far apart, this is a language where checking that your device reads it aloud properly pays for itself.
Japanese, where a card is a word plus its reading. Put the written word on the front and put the reading and the meaning on the back. If you're learning characters, resist the temptation to make one card hold three readings and four meanings; split them. For the vocabulary side of Japanese, such as JLPT levels, we wrote a separate comparison. And as with any language that isn't well covered by your device voices, test the audio first.
The same arithmetic works for all three. Say you have a 600-card deck and you add 15 new cards a day: you've introduced everything in 40 days, and the older cards have been spaced out by then, so your daily session doesn't grow in proportion to the deck. That's the point of scheduling. If you want your own numbers, put them into the schedule calculator before you start, and pick the new-card number you can keep up when you're tired.
Where Flips doesn't fit
Flips is built for remembering: vocabulary, phrases, terms. It has no grammar lessons, no speaking practice, and no course path, so if you're starting from zero and want to be taught, use a course or a class and bring the words into Flips as you go. We also won't tell you what other apps cost or include, because that changes; check each app's own page for its free plan and features before you decide.
Frequently asked questions
Is a flashcard app enough to learn a language?
Not by itself. Flashcards are very good at vocabulary and phrases, but you also need listening, reading, and speaking, and usually some explanation of grammar. Most learners use a flashcard app next to a course, a class, or a lot of listening.
How many new words should I add per day?
Pick a number you can keep up on a bad day, often somewhere around 10 to 20, and raise it only if reviews stay easy. Each new card adds reviews later, so adding too many at once makes the next week harder.
Can I use Flips for more than one language?
Yes. Make a separate deck for each language, or several decks within a language, and study them together or one at a time. Read-aloud support depends on the languages your device supports.
Can I bring in a vocabulary list I already have?
Yes. Flips can import a deck from a CSV or TSV file, so a list from a spreadsheet or a teacher can become a deck without retyping it.
Flips
Start a deck in the language you're learning and let the app decide what to review today. Free to start, on iPhone and Android.
Learn more about Flips