Original, translation, pronunciation, grammar, and memory stay in one place.
The original sentence and a clear translation are stored together with IPA pronunciation and grammar explained in the language you prefer to read.
Turn the sentences you translate into vocabulary you can use.
Bookmark any sentence and Hiisi gives you the translation, the grammar, the pronunciation, and a flashcard that comes back for review.
Fifteen languagesSmart flashcardsPronunciation guide
English to Spanish
saved for review
I forgot my keys at home
Olvidé mis llaves en casa
Review memory
This sentence comes back before it leaves your head.
Pick the language you have been meaning to learn
Watch the loop
Press play and meet Hiisi properly
The product is built around one small action: save a sentence when it matters. The grammar, pronunciation, colour matching, and review card stay attached after that.
The leak
The sentence you translated last week. Can you say it now?
That moment happens often. You see a phrase. You paste it into a translator. The meaning makes sense, right there in your hand. A week passes. The wording has left your memory, and the meaning has gone with it.
Translation holds the meaning for the moment you read it. But the work of learning a sentence usually takes four separate tools. Using all four takes time, and the next sentence is gone before you finish the flashcard.
- A translator for the meaning
- A grammar reference for the structure
- A pronunciation guide for the sound
- A flashcard app for memory retention
Tap once
What happens when you bookmark a sentence in Hiisi
Hiisi gives you the sentence as a structured learning item, ready to study, within seconds. The sentence stays in your library, with the translation and grammar attached.
Colour-matched words
A word and its translation share the same colour. You see which translation piece belongs to which original at a glance.
Grammar in the language you already think in
Read Parisian French grammar in English, or Spanish grammar in Polish. Your attention stays on the sentence you are learning.
Pronunciation you can read
Every sentence comes with the kind of written pronunciation guide dictionaries use, so you see how it sounds before you say it.
Flashcards that schedule themselves
Each bookmarked sentence becomes a card. SM-2, the Anki algorithm, decides when it comes back.
Start anywhere
What you can use Hiisi on
A sentence is enough to start. Anything you read or hear in a new language works with Hiisi.
Lyrics from a song you keep replaying
Articles in the language you are learning
Messages from native-speaker friends
Lines from films or podcasts you save
The page you are reading right now
The daily loop
What learning inside Hiisi looks like
Open Hiisi. The cards due today are waiting, each one a sentence you saved, with its translation and grammar already attached. See a new sentence you want to keep? Bookmark it. It enters tomorrow's review pile.
Translate something real
A sentence from a song, message, article, film, podcast, or webpage becomes the source material.
Bookmark the sentence
Hiisi attaches the translation, IPA pronunciation, grammar explanation, and colour-matched word map.
Review when memory needs it
The flashcard comes back according to SM-2, so you review what you are about to forget.
Built for self-learners and students
Lost a useful sentence before? Hiisi was built for you.
Beginners
Building their first phrases in a new language.
Intermediate learners
Reading more confidently but still getting caught by grammar.
Heritage speakers
Reconnecting with the language at home through sentences that matter.
Travellers and partners
Saving sentences they will actually use with native speakers.
Start using Hiisi today
Fourteen days free. Then pick the plan that fits.
Hiisi gives you the meaning, grammar, pronunciation, and a flashcard that comes back to find you. Fifteen languages are ready when you are.
Founding Member
€6.58/month
Billed annually at €79. Save €41/year compared to monthly while the founder plan is available.
Founding Member
€79 /year
- 600 translations a month
- Unlimited flashcards, decks, and reviews
- Grammar explanations and pronunciation guides
- Spaced repetition with SM-2 scheduling
14-day free trial included. Limited to the first 100 members.
Monthly
€10 /month
- 600 translations a month
- Unlimited flashcards, decks, and reviews
- Grammar explanations and pronunciation guides
- Cancel whenever you need to
14-day free trial included.
Frequently asked questions
The practical objections, answered.
Do I need to create my own flashcards?
No. Hiisi automatically generates flashcards from any sentence you bookmark, complete with translations, IPA, and grammar context.
Can I learn from English to French, or French to English?
Yes. Hiisi supports all 15 languages in any direction. You can set your native and target language freely among the supported list.
Is there a mobile app?
Hiisi is currently a responsive web application designed to work on both desktop and mobile browsers.
The sentence is yours from then on
Start using Hiisi today
Hiisi gives you the meaning, grammar, pronunciation, and a flashcard that comes back to find you. Fifteen languages are ready when you are.