Sayumi
At the right moment
Every card has its own plan. It adapts after each answer.
AI vocabulary trainer for iPhone
Words that stick.
Sayumi is a vocabulary trainer for iPhone. You describe what you need a language for, and the AI creates matching words with example sentences, pronunciation and grammar. A review schedule based on FSRS brings every word back right before you forget it.
15Study modes
20Languages
28Trophies
0Ads, accounts or tracking
Your own vocabulary set in three steps
Instead of a ready-made list from a textbook, you get a set built around your situation. Sayumi then plans the reviews on its own.
Say what you’re learning for
A holiday in Italy, meetings in English or your first steps in Japanese: describe your situation in your own words and choose your level.
The AI builds your set
The AI writes words and short phrases for your topic. Every card has an example sentence, pronunciation, part of speech, gender and plural, and duplicates are filtered out.
Learning with a plan
The Smart Mix introduces new words, quizzes you on them and brings them back right before you’d forget them.
15 study modes, from first recognition to free speaking
The Smart Mix picks the exercise that helps most for each word. New words start with easy tasks; solid words get harder ones.
Also included: dictation, sentence listening and sentence dictation. The Smart Mix combines all modes.
You see new words calmly first, with meaning, pronunciation and an example sentence. A few cards later, Sayumi quizzes you on them.
Spaced repetition
Review right before you forget
Without review, a new word is gone within days. Using the FSRS algorithm, Sayumi works out for each word when your chance of remembering it drops to 90% and quizzes you then. With every correct answer, the gap grows.
How well a word sticks
How you answer matters
Typing and speaking count more than recognizing. If you hesitate for a long time, the word comes back a little sooner.
Fair after breaks
After a break, what’s still fresh comes first. New words wait until you’ve caught up.
Keep learning after your daily goal
Once today’s cards are done, you can keep going: shaky words often, solid ones rarely, and never the same word twice in a row.
AI vocabulary
AI vocabulary sets for your topic
You learn the words you need in your situation, not lists from a textbook. Every card is complete, and more words are one tap away.
- Example sentence in both languagesSo you see every word in context right away.
- Pronunciation to read and hearPhonetic spelling on the card, read aloud by your iPhone’s voices.
- Part of speech, gender and pluralGrammar sits right on the card. Gender gets its own practice mode.
- More words, no duplicatesTap an idea or write what you’re missing. Words you already have are left out.
- Or no AI at allCreate your own cards, import CSV files or Anki exports, share sets as a file.
What are you learning for?
This summer I’m going to Rome. I want to order at restaurants, ask for directions and go shopping.
Your set is ready, with example sentences and pronunciation
- il contonoun · mthe bill“Il conto, per favore!”
- prenotareverbto book“Vorrei prenotare un tavolo.”
- a destraadverbon the right“L’albergo è subito a destra.”
- Quanto costa?phraseHow much is it?“Scusi, quanto costa?”
More words before you run out of new ones
Sayumi shows you how many days your new words will last. With “Add vocabulary” you pick ideas like idioms, verbs or small talk, or you write what you’re missing.
Pronunciation
Practice pronunciation without your voice leaving your iPhone
In “Speaking” you say the translation out loud; in “Shadowing” you repeat whole sentences. Speech recognition runs on the device. Recordings are neither stored nor sent.
- Recognition on the deviceWorks offline too, once the language pack has been downloaded.
- Scored fairlyArticles are optional, accents you can’t hear don’t count, and numbers may be spelled out.
- Sentences that match your levelSingle words first, whole sentences later, marked word by word.
- “Can’t speak right now”One tap, and speaking exercises pause for an hour.
Staying on track is easy
A daily goal, a streak and levels show you that you’re making progress. Miss a day, and streak protection steps in.
Streak, daily goal and levels
You set your own daily goal. The streak grows with every study day, your level with every answer. Streak protection automatically bridges a missed day.
Fri
Sat
Sun
Mon
Tue
Wed
Today
28 trophies
From your very first word to a full year’s streak.
Daily quests
Two new quests every day and one for the week keep the routine varied.
Reminders at the right time
Sayumi reminds you at the time you usually study and warns you in the evening before your streak breaks.
Progress at a glance
A forecast of the coming days, an activity calendar, a weekly recap and how long your words have been sticking.
A reward after every session
XP, level-ups and your streak at a glance. Still in the mood? Tap “Keep learning”.
Widget
Due cards and your streak on your Home Screen.
Siri Shortcut
“Learn with Sayumi” starts today’s session.
iCloud sync
Sets and progress on all your iPhones.
Weekly recap
What you achieved, compared with the week before.
A look inside the app
Uncluttered and easy to read, in light and dark.
Appearance
Light, dark and easy to read
Sayumi follows your iPhone’s setting or stays light or dark. Add large text, VoiceOver and cues that work without color.
- Dark modeAutomatic or set manually.
- AccessibleDynamic Type, VoiceOver and “Differentiate Without Color”.
Learn vocabulary in 20 languages
Each language with its own script, read-aloud voice and speech recognition, wherever your iPhone offers them.
- Arabic مرحبا
- Chinese 你好
- Czech Ahoj
- Danish Hej
- Dutch Hallo
- English Hello
- Finnish Hei
- French Bonjour
- German Hallo
- Greek Γεια σου
- Italian Ciao
- Japanese こんにちは
- Korean 안녕하세요
- Norwegian Hei
- Polish Cześć
- Portuguese Olá
- Russian Привет
- Spanish Hola
- Swedish Hej
- Turkish Merhaba
No account, no ads, no tracking
Your learning data stays on your iPhone and, if you like, in your private iCloud. Sayumi has no server of its own.
No account needed
Start right away, with no email address and no password.
No ads, no tracking
Sayumi contains no ads and no analytics or tracking tools.
In your iCloud
Synced through your private iCloud database. We have no access to it.
AI only with your consent
Only after you agree are your topic description and vocabulary sent to the AI (OpenAI). You can withdraw consent in Settings.
Your voice stays on the device
Speech recognition runs on your iPhone. Recordings are neither stored nor sent.
Export and delete
Export all your data at any time, or delete everything with one tap.
Frequently asked questions about Sayumi
What is Sayumi?
Sayumi is a vocabulary trainer for iPhone. You describe what you need a language for, and the AI creates matching vocabulary with example sentences, pronunciation and grammar. A review schedule based on the FSRS algorithm quizzes you on every word right before you would forget it.
How is Sayumi different from other vocabulary apps?
Most vocabulary apps need ready-made lists. Sayumi creates the words for your topic with AI, adds an example sentence, pronunciation and grammar, and practices them in 15 modes, from recognition to free speaking. You can still import your own lists from Anki or CSV.
Which languages can I learn with Sayumi?
20 languages: Arabic, Chinese, Czech, Danish, Dutch, English, Finnish, French, German, Greek, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish and Turkish. The app itself is available in English and German.
How does the AI create my vocabulary?
With your explicit consent, Sayumi sends your topic description to OpenAI. The response is checked automatically: duplicate words, incomplete cards and wrong languages are filtered out. You don’t need an account for this.
What are spaced repetition and FSRS?
Spaced repetition means reviewing words at growing intervals, each time right before you would forget them. Sayumi uses FSRS for this, a modern, research-based algorithm that calculates for each word how well it sticks.
Can I add or import my own vocabulary?
Yes. You can create your own cards, import lists as CSV or TSV files and Anki exports in text format, and share whole sets with others as a file.
Does Sayumi work offline?
Studying, read-aloud and speech recognition work without an internet connection. Only creating new vocabulary with AI needs one. iCloud sync catches up as soon as you’re back online.
Do I need an account?
No. Sayumi works without an account, without an email address and without ads. Your data lives on your iPhone and, if you like, in your private iCloud.
Is Sayumi available for Android?
No, Sayumi is an iPhone app. You can export your sets at any time as CSV or as a file.
Start with your first vocabulary set
Sayumi is coming soon to iPhone. Describe your topic, and the AI creates your first set in seconds.