Flashcards are created on the Translator screen, accessed by tapping 
in the bottom navigation bar.
There are two ways to create a card: 
Translation mode and 
Manual mode. Both save to the same deck and produce the same card object. The difference is in how the back text is filled in.
Before you create
Two things need to be set before you can save a card: a deck and a language pair.
Choosing a deck
The current deck is shown in the header at the top of the screen. Tap it to open the deck selector and choose a different deck, or to create a new one.
The app remembers the last deck you used. When you return to the Translator screen, it restores that deck automatically.
Note
Every card must belong to a deck. If you have not created a deck yet, the deck selector will prompt you to create one before you can continue.
Setting languages
Each card panel has a language, shown as a flag. The left panel is the front of the card (the word you want to learn); the right panel is the back (the translation).
Tap a flag to change the language for that panel. You can also tap the swap icon between the two flags to reverse the pair.
Languages are saved per deck. Once you set them for a deck, the Translator screen restores them automatically the next time you select that deck.
Translation mode
Translation mode is the default. flangu translates the front text automatically.
- Tap the front panel and type the word or phrase you want to learn.
- Tap Translate.
flangu translates the text and fills in the back panel. The card is saved immediately once the translation arrives. A "Flashcard created" confirmation appears at the bottom of the screen.
A moment later, linguistic metadata (synonyms, definitions, example sentences, pronunciations, and alternative translations) is attached to the card in the background. You do not need to do anything. The card is fully usable before it arrives.
When the metadata arrives, the back panel opens its 
Alternatives section. If the translation has no alternatives, the front panel opens its 
Definition section instead. Only one section opens, so both words stay fully visible. The other sections are one tap away in each panel's icon row.
Note
Translation mode requires an internet connection. If you are offline, the toggle switches to Manual automatically and a message explains why.
Typos and language mismatches
flangu translates whatever you type, the way a human translator would. It does not refuse to translate a word, and slang or strong language is translated as-is rather than softened.
Misspelled input. If what you typed has a typo or a missing accent mark, flangu translates the word you meant and still creates the card right away. The front keeps the text exactly as you typed it. A snackbar asks "Did you mean '[word]'?". Tap Use '[word]' to replace the card with one built from the corrected spelling. Dismiss the snackbar with its close icon to keep the card as it is.
This also covers a word typed in Latin letters for a language that uses another script. In a Japanese deck, "neko" is read as 猫. In a Russian deck, "privet" is read as привет.
Wrong-language input. If what you typed is not in the front panel's language, flangu leaves it unchanged in the back panel and does not create a card. What the snackbar offers depends on what the text is:
| What you typed | Snackbar | Action |
|---|---|---|
| Text in the back panel's language | "This looks like [back language]." | Translate from [back language] swaps the front and back languages and translates the text again. |
| Text in another supported language | "This looks like [language]." | Translate from [language] sets the front language to that language, keeps the back language, and translates the text again. The deck's front language changes too. |
| Random characters, or a language flangu does not support | "This doesn't look like [front language]." | None. Check the spelling or the selected language. |
For example, in a Polish to English deck, typing "Hund" shows "This looks like German." Tapping Translate from German changes the deck to German to English and creates the card "Hund → dog".
Nouns with articles
When a single noun is translated into a language with grammatical gender, the translation includes its article, so you learn the gender with the word.
| Article | Languages | Examples |
|---|---|---|
| Definite | German, Spanish, Portuguese, Portuguese (Brazil), Dutch, Greek | der Hund, el perro, o cão, het huis |
| Definite, or indefinite where the definite article would shorten to l' | French, Italian | la maison, un arbre, il cane, un albero |
| Indefinite | Romanian, Swedish, Danish, Norwegian | un câine, ett hus, et hus |
Alternative translations use the same form. English translations of nouns come without an article: "Hund" becomes "dog", not "the dog". Japanese verbs and adjectives are given in their dictionary form.
This only applies to text that flangu translates. In Manual mode you can type a noun with or without its article.
The alternative translation picker
After translation, the back panel shows the primary translation. If it is not the right word for your purpose, you can swap it before the card is finalized.
The back panel displays a list of alternative translations below the primary one. Each has a short note in the language you typed in, so you can see which meaning you are picking: for "plant", "la fábrica" is marked "factory". Tap any alternative to replace the back text with it.
When you select an alternative, flangu re-fetches the linguistic metadata for the new translation pair. The synonyms, definitions, examples, and pronunciations are regenerated to match the word you actually chose. The card's back is updated in place.
This picker is available immediately after translation, before you navigate away. It is not available from the card edit screen later.
Manual mode
In Manual mode, you fill in both sides yourself.
Tap the mode toggle in the bottom toolbar to switch to Manual.
- Tap the front panel and type the word.
- Tap the back panel and type the translation.
- Tap Create.
The card is saved immediately. No translation step occurs. Linguistic metadata is not generated automatically for manual cards.
Note
Manual cards are saved with both sides exactly as you typed them. If you want linguistic metadata added later, you can request it from the card detail screen.
Whether a card was created manually or via translation, every field on it can be changed afterward. See Editing a flashcard for what's editable and how.
After the card is saved
"Flashcard created" confirmation
A snackbar appears at the bottom of the screen confirming the card was saved. It includes an Undo button.
Tapping Undo soft-deletes the card. The card is removed from the deck and the review queue immediately. You can still access it through Translation History (described below) and restore it from there.
The snackbar dismisses on its own after a few seconds.
Duplicate detection
flangu checks whether the same front-and-back combination already exists in the same deck. If a duplicate is found, the "Flashcard created" confirmation is replaced by a warning: "Flashcard already exists in this deck."
Three options appear:
| Option | What it does |
|---|---|
| Keep Old | Discards the newly created card and keeps the existing one. |
| Keep New | Deletes the existing card and keeps the new one. |
| Keep Both | Keeps both cards in the deck. |
Duplicates are detected per deck. The same card can exist in two different decks without triggering a warning.
Translation History
The 
history icon in the bottom toolbar opens Translation History: a list of all cards sorted by creation date, most recent first, grouped by Today, Yesterday, and earlier dates.
Cards created during the current session are highlighted with a NEW badge until you open the history panel.
From Translation History you can tap any card to open its detail page, edit it, or delete it.
Starting the next card
Tap New Card to clear both panels and start again. The deck and language settings are preserved.