Flashcard app for iPhone and iPad
Make your own cards for any language, study them by swiping, and let Just R schedule each review on the Ebbinghaus forgetting curve. Words stick because you repeat them on time.
Free · In-app purchases · iOS 16 or later
How it works
Memory fades fastest in the first hours after you learn something. Just R reminds you to repeat a deck at growing intervals, so each review lands just before a word slips away.
Add words or phrases with a translation, a note, a tag and a color. Type them, dictate them or import a CSV file.
Flip each card and mark it Remember or Forgot. Listen to it read aloud at the speed you like.
Turn on the forgetting curve and Just R sets the reminders for the deck, as a notification or a Calendar event.
Prefer your own rhythm? Add reminders at the times you choose instead.
Features
Build your own vocabulary decks, practise them in short sessions and keep track of every repetition.
Group decks by topic, give each one a color and a description, and mark a deck as finished when you know it.
Word to word, sentence to sentence, sentence to flip, recorded sentence and quote.
Hear cards read aloud in both languages. Choose the voice, speed and pitch, and play a deck hands-free.
Choose Record sentence, hold the button and say the phrase: iOS speech recognition types it in.
Tag cards across decks, sort and filter them, and search every card you have made.
See how many times you repeated a deck today and in total, and every date you reviewed it.
A random card or quote from your decks on the Home Screen, in medium or large size.
Bring in word lists from a spreadsheet, or export your cards to back them up.
Study without a connection. Sign in with Apple, email or phone to sync your decks.
Inside the app
Real screens from the app. Scroll sideways to see more.
AI tools
Abstract words are the hardest to remember. Optional AI tools give a card something to hold on to.
Describe a scene and Just R draws a picture for the card. An image is easier to recall than a word alone.
Have a card read aloud in a natural AI voice instead of the built-in system voice.
See how a word or phrase is used in real sentences before you add it to a deck.
AI features ask for your permission first. Only the text of the card is sent to OpenAI to create the result, never your name, email or account details. How AI features handle your data
Ready-made decks
Not sure where to begin? The Phrases tab has decks of idioms, phrasal verbs and everyday expressions, ready to save to your collection.
Reminders
Choose how each deck reminds you: a notification on your iPhone, or an event in your Calendar next to everything else you have planned.
Pricing
Download Just R for free and make your first decks today. Premium removes the limits and adds ready-made decks and AI tools.
The free version limits how many decks and cards you can make, and it shows ads.
A subscription from a week to a year, or a one-time lifetime purchase.
The App Store shows the price in your currency before you buy. Subscriptions renew automatically until you cancel them in your Apple Account settings. Prices and subscription terms
FAQ
Just R is a flashcard app for iPhone and iPad. You make decks of words and phrases in any language, study them by flipping cards and marking Remember or Forgot, and the app reminds you to repeat each deck on the Ebbinghaus forgetting curve.
Turn on the forgetting curve for a deck and Just R sets reminders 1 minute, 20 minutes, 1 hour, 9 hours, 1 day, 2 days, 6 days, 1 month and 3 months later. Each review comes just as you would start to forget, so the gaps can keep growing. You can also set your own reminder times.
Any language. You write the cards, so Just R works for English, Spanish, German, Polish or any other pair. Cards are read aloud with the voices installed on your iPhone or iPad. The app itself is in English, Ukrainian, Russian, German and Spanish.
Just R is free to download, and you can make decks and cards, study them and get reminders for free. The free version has limits on how many decks, cards and categories you can make and shows ads. Premium removes the limits and adds ready-made decks, decks with video, AI voice and word context.
The free version shows ads from Google AdMob. Ads are personalized only if you allow tracking when iOS asks; otherwise they are not personalized. You can review your choices in the app under Ads privacy settings.
Yes. Sign in with Apple, email or phone and your decks sync to your account, so they are there on a new iPhone or your iPad.
From the blog
Guides to spaced repetition, memorizing vocabulary and making flashcards that work.
Memory science
In 1885 Hermann Ebbinghaus memorized nonsense syllables and timed how fast he forgot them. Here's what his curve really shows, what later research added, and how to turn it into a review schedule you'll keep.
Vocabulary
Speed comes from wasting fewer reviews, not from cramming more words into one evening. Here's a method built on what memory research supports, and what it can't promise.
Flashcards
A flashcard is only as good as what's written on it. Here are the rules that make cards quick to review, how paper compares with an app, and how to build your first deck in Just R.
Download Just R for free, make your first deck in a minute and let the forgetting curve plan your reviews.
