Build the vocabulary that matters to you.
Personalized Spanish flashcards from anything you love — tuned to your level.
Free on iPhone during the launch window. On Android? Get notified.
Build your vocabulary!
Spanish flashcards that learn from anything you love.
Three steps to a deck.
Tell HelloStello what you want to learn. It builds the deck. You study.
Describe what you want to learn
Type a natural-language prompt like "I'm watching Stranger Things in Spanish" or "I work with Spanish-speaking patients in the ER." HelloStello uses that to generate a themed 20-card deck of vocabulary tuned to your CEFR level.
Personalized to your prompt
Cards are generated from your prompt and calibrated to your CEFR level — every Spanish word, the example sentence, the English translation, the pronunciation. Cards are filtered for copyright and language-appropriateness before they reach you.
Study, refine, repeat
Swipe through your deck. Save the words that resonate, remove the ones that don't. When you finish a rotation, refine the prompt to get 10 more cards on a sharper angle — Season 2 only, plot vocabulary only, body parts only. Build your own learning loop.
Behind the scenes: every card includes the Spanish word, IPA pronunciation, an example sentence in context, and an English translation.
Built for how you actually learn.
Vocabulary tied to context. Repetition that respects your time. Gentle gamification that nudges, not nags.
Decks built from anything
Don't browse a generic vocabulary list — describe what you actually want to learn. HelloStello generates a themed deck from your prompt, calibrated to your proficiency level. From "I'm honeymooning in Mexico" to "I'm a kindergarten teacher in San Antonio."
Flashcards that grow with you
Enhance any deck with 10 more themed cards in a single tap. Or drop in any word you encounter with + Card. Your decks grow as your curiosity does.
Gentle daily habit
Set your daily card goal. HelloStello tracks your streak and sends a quiet reminder if you haven't studied — never guilt-trippy, never an arms race.
Content you can trust
Every generated card passes through copyright and language-appropriateness filters before reaching you. No surprises, no off-color words your nephew would repeat.
What's in HelloStello — and what's coming.
- Personalized Spanish flashcards from anything you love — tuned to your level.
- Deck Builder — describe what you want to learn about, get a themed deck in seconds.
- Enhance — add 10 more themed cards to any deck with one tap.
- Spaced-repetition study with card rotation that adapts to your proficiency level.
- End-of-deck Quiz Mode with adaptive question types.
- Points, day streaks, and daily goals — turn them on if that's your thing, or leave them off.
- CEFR-aligned vocabulary at four proficiency levels (Absolute Beginner → Advanced).
- Available on iPhone today — download it from the App Store.
- Native Spanish pronunciation — audio playback for every card, with regional voice options.
- New Quiz question types — including the Accent Game (letter-box tap UI for accented words), and Synonym / Antonym multiple choice.
- Curated grammar decks — ready-made decks for the trickiest parts of Spanish: Ser vs. Estar, Haber el Horrible, Por vs. Para, Aquí · allá · allí · acá, verb conjugations, and irregular verbs.
- Antonym and Synonym flashcards — new card formats built specifically around adjectives.
- Extended verb-conjugation practice — deeper Verb Mode with more tenses per proficiency level.
- Additional target languages — Portuguese (Brazilian and European), French, German, Italian.
- Android app — bringing HelloStello to Android after the iOS launch stabilizes.
- Cross-device sync — pick up where you left off on any device.
Free at launch.
Use HelloStello free during the launch window. Monthly limits keep things predictable.
$0 / month at launch
- 5 decks built per calendar month — natural-language prompt → 20 cards each
- 5 Enhance refinements per calendar month — refine the prompt → 10 more cards
- 20 single-card additions per calendar month — type any word, get a full card
- Unlimited study — review your saved decks as much as you want
Limits reset on the 1st of each calendar month (UTC). After the launch window, a paid Pro tier will lift the limits — pricing TBD.
Get notified when HelloStello launches on Android.
HelloStello is live on iOS today. Android is on the roadmap — drop your email and we'll let you know when it's ready.
Questions, answered.
HelloStello is available now on the App Store for iPhone. Download it, choose your proficiency level, and build your first deck in under a minute. Android is on our roadmap — add your email to the Android list and we'll let you know when it's ready.