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Otto changes some of the words you read and hear into the language you're learning, at your level, in the app and on any website. You still understand everything, and pick up new words as you go.
In eleven languages: English, Spanish, French, German, Italian, Portuguese, Chinese, Japanese, Korean, Hindi and Arabic.
These examples are for illustration only. Otto isn't connected to any brand shown. It works on most websites and video sites: articles, subtitles, search results and more.
Otto works on what you already enjoy, so practice happens without setting time aside.
News, blogs, recipes and search results, in Otto's browser or with the extension in Chrome and Safari.
A library of great books, woven at your level, with your place kept on every device.
Some of the words you hear are spoken in your new language, in a natural voice.
Subtitles on video sites carry your words too, so a film is practice as well.
Otto rests on three hard problems in language AI. None of them is solved by translating whole sentences, so this is where our research goes.
Translating part of a sentence is harder than translating all of it. Each swapped word has to agree with the words around it, keep its meaning in context, and match what this reader is ready to learn, so the sentence still reads naturally.
Speech that changes language mid-sentence. Swapped words are spoken with a native accent inside the original voice, with the timing and intonation that keep the sentence flowing, for podcasts and reading aloud.
When a word in a video changes language, the speaker's lips should change with it. We are researching lip-sync that re-renders only the mouth, for only the swapped word, so learners can watch as well as listen.
You read what you'd read anyway. Otto swaps in words from the language you're learning, as many as your level allows, and adds more as you improve.
Choose the language you want to learn, then your level: a few everyday words, or most of the page.
Read a book in the app, listen to a podcast, or open any website in your browser. Otto changes some of the words into your new language. The rest stays in your own language, so you still follow everything.
You see what it means and hear how it sounds. If you've seen the word before, Otto asks you to remember it first, because trying to remember helps it stick. Save any word with one tap.
Your saved words go to Learn, where short games help you practise them. As you learn more words, Otto shows you more, so you keep moving up.
Research shows we learn a language best from things that are only a little harder than what we already know. Otto keeps your reading at that point: enough new words to learn from, and enough of your own language to follow what's happening.
Otto starts with the most common words, because a few hundred of them make up most everyday text. As your level rises, less common words appear. Each new word comes inside a sentence you understand, which makes it easier to remember, and when you save a word, its sentence is saved with it.
Research also shows that testing yourself works better than reading something again. So when you tap a word you've seen before, Otto hides the answer until you've tried to remember it. Games and quizzes use your own saved words, from the app or the web, and your tutor can test you on what you read.
Everything Otto does is in the free app. Pro and Max let you read more each day and connect you with your tutor.
Your plan is active. The app and the browser extension will show it within a few minutes.
Stripe has emailed you a receipt. You can cancel any time, and your plan lasts until the end of the month you paid for.
Your subscription is linked to this account. There's one more step after this.
Buy here for the browser extension or Android. On iPhone, subscribe inside the app, through the App Store. Prices are shown in your currency. Cancel any time.
Read five times more than on the free plan, save as many words as you like, and work with your tutor.
Read five times more than on Pro, use every model, and get the fastest service.
Buy here for the browser extension or Android. On iPhone, subscribe inside the app, through the App Store. Prices are shown in your currency. Cancel any time.
| OttoFree, always | Otto Pro£3.99 a month | Otto Max£9.99 a month | |
|---|---|---|---|
| Everyday usage | Resets every 5 hours | 5× Free | 5× Pro |
| Words you can save a day | 20 | Unlimited | Unlimited |
| Books and podcasts at your level | ✓ | ✓ | ✓ |
| Any website in your browser | ✓ | ✓ | ✓ |
| Film and TV subtitles in your browser | ✓ | ✓ | ✓ |
| Tap any word to translate | ✓ | ✓ | ✓ |
| Games and tests | ✓ | ✓ | ✓ |
| Model | Dreamweaver | Dreamweaver | Every model, first |
| Priority speed | – | – | ✓ |
| Link with your tutor | – | ✓ | ✓ |
| Tutor assignments and tests | – | ✓ | ✓ |
| Detailed progress charts | – | ✓ | ✓ |
| First access to new features | – | ✓ | ✓ |
Start with the free app. If you ever reach the daily limit, you can upgrade inside the app. Most people never do.
Students learn the most between lessons. Otto gives them something worth reading every day, and you decide what they read, what they're tested on, and what you see.
Every student, as many as you like, with no contract. Use it in all your classes for a full school year, then decide.
After the free year, from €1 per student per month. Start your free yearIn a Teams, Meet or Zoom lesson, Otto can listen, with everyone's consent, and note the new words, corrections and homework you mention. They go to your student's word bank afterwards.
Set a timed read. Your student picks a page, reads it in Otto while the clock runs, then writes a summary. You see the page, the summary, the words they looked up and how long they took.
Set chapters from Otto's library of classic books, or any web page. Students read at their own level, and you see how far they got and which words they looked up.
Practice built from the words each student actually looked up in your work, not a general list. It repeats until they get every word right.
Name the book, the page and the exercises, and Otto keeps track. Students answer in the app or tick the work off to bring to class. Books you've used before are suggested for your next student.
Give the same work to a whole class at once, and still see each student's result. Add or remove students whenever your groups change.
Scores for each part, written answers you mark yourself, comments back to the student, and the words they looked up while working, so you know what was hard before the lesson.
A student can use the app in Spanish and still learn French with you. You choose the level and the language of the work you set.
Message each student directly, and get a notification the moment work is handed in. No more chasing homework across different apps.
The portal works in any web browser. There's nothing to install or set up, and most tutors are setting work within a few minutes. If you'd like help, or you're bringing Otto to a whole department, we'll set it up with you and stay with you for as long as you need.
Open the tutor portal in your browser and sign in with your Otto tutor account.
Students connect to you from their app. Set each student's language, level and usual lesson day. Work is due by their next lesson unless you choose otherwise.
Choose what to set, or build a test, in a couple of minutes. Results, marking and messages all come back to one screen.
Using Otto across a class or a whole department? We'll help you set up tutors, groups and lesson times, and agree a price that works for schools.
Otto is a UK AI start-up building the most complete way to learn a language. Otto turns the reading and listening people already do into learning moments pitched at their exact level.
Most people who start a language give up, because study time has to compete with everything else in their day. Otto removes that choice. The articles, books, websites and podcasts people enjoy become their practice, so progress happens every day without setting time aside.
Our weaving engine swaps in words from the language you're learning, chosen by how common they are and how much you already know. It works on any website, in the Otto app's browser and in Chrome and Safari.
A library of classic books, and podcasts in which Otto changes some of the words you hear into your new language with AI voices. Both adapt to your level as you read and listen.
Complete grammar courses in French, Spanish, German, Italian and Portuguese, 102 topics each, with games and quizzes built from each learner's own saved words.
A tutor portal and in-app tools to set reading, run timed assessments and follow each student's progress, so learning carries on between lessons.
We use AI to adapt and translate content, to voice podcasts, and to recognise speech when learners practise saying words aloud. Every feature is built to make learning more personal.
Otto is built on three well-established findings: we learn from input only slightly harder than what we know, the most common words matter most, and testing ourselves beats re-reading.
Hundreds of millions of people are learning a language, yet almost every product competes for the same few minutes of study a day. Otto doesn't. It works inside the hours people already spend reading, browsing and listening, which makes it a daily habit rather than a chore.
From individual learners to tutors, schools and organisations, Otto grows with every reader, book, podcast and language we add.
For partnerships, investment and press, we'd love to hear from you.
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