Welcome to boca.
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Master any language.
Your brain never stops.

Neuroscience-backed AI training across 47 languages. Phoneme-level pronunciation. Cognitive cascade tracking. Music, stories, and immersion content at your exact level.

47
Languages
24h
Learning cycle
ILR
Proficiency scale
Start training free
Your AI trainer
A trainer that sees, hears, and adapts.
Named personas with authentic accents, cultural expertise, and adaptive personalities. Not a chatbot. A coach.
👩🏽
Sofia
Latin American Spanish trainer
Hola, bienvenido. Hoy vamos a practicar el subjuntivo. No te preocupes, vamos paso a paso.
Muy bien. Ahora dime: "Espero que vengas manana." Escucha la diferencia entre vienes y vengas.
L3 Cascade 2.4 mJ
The method
What the science says actually works.
Built on DLI/FSI methodology, modern neuroscience, and polyglot strategies. Not gamification.
🔄

FSRS spaced repetition

Next-generation algorithm that models memory as stability + difficulty. 20-30% fewer reviews than Anki for the same retention.

👄

Multi-modal drills

Hear it. Read it. Say it. Write it. Four independent memory traces per item. No other app requires all four channels.

💭

Inner speech coaching

Learn to think in the language. Guided internal monologue is the fastest path to dreaming in your target language.

⚡

Procedural grammar

200-400 contextualized reps per structure until grammar becomes automatic. Not rule memorization. Muscle memory for sentences.

🪞

Shadowing

Repeat simultaneously with the trainer. Imprints phonological patterns into motor cortex. The polyglot's secret weapon.

🌊

Emergence tracking

Detects when you produce sentences you were never taught. Novel recombination = the language becoming yours.

📊

Production entropy

Shannon entropy of your output. Low = formulaic. High = creative. Tracks the exact moment you stop reciting and start creating.

🎭

Language identity

Who are you in Spanish? Your humor, formality, expressiveness all shift. We track the emergence of your L2 persona.

😴

Sleep learning

TMR playlists during slow-wave sleep. Pre-sleep routines. Dream journaling. Morning retrieval. 24-hour learning cycle.

Immersive content
Songs, stories, and scenes at your exact level.
AI-generated entertainment content calibrated to your i+1. You don't study the language. You live in it.
Spanish
Song
En la plaza del pueblo
A folk ballad about a village market. Present tense verbs, food vocabulary, cultural customs.
ILR 1 / Pop / 120 BPM
French
Micro-story
Le chat du boulanger
A mysterious cat appears at the bakery each morning. Past tense narration, daily routine vocabulary.
ILR 1+ / Mystery / 90 sec
Japanese
Scene
Ramen-ya no yoru
Late-night ramen shop conversation between a regular and a new customer. Polite forms, food ordering.
ILR 0+ / Dialogue / 90 sec
Mandarin
Chant
Si sheng lianxi
Rhythmic tone drill: ma, ma, ma, ma. Four tones in musical patterns building from slow to fast.
ILR 0 / Phonology / 70 BPM
Arabic
Poetry
Qamar al-layl
Moon over the night. Short romantic poem with pharyngeal consonants woven through imagery.
ILR 1+ / 8 lines
Korean
Song
Seoul-ui bam
K-pop style song about a night in Seoul. Polite speech levels, city vocabulary, tense consonants.
ILR 1 / Pop / 110 BPM
Portuguese
Micro-story
O surfista de Copacabana
A surfer finds a message in a bottle. Preterite tense, beach vocabulary, Brazilian culture.
ILR 1 / Adventure / 90 sec
German
Scene
Im Biergarten
Ordering at a Biergarten. Cases in action, food/drink vocabulary, formal register.
ILR 0+ / Dialogue / 90 sec
Italian
Song
Sotto il sole di Roma
A warm ballad about Roman summers. Open vowels, geminate consonants, emotional expression.
ILR 1 / Ballad / 85 BPM
Russian
Micro-story
Babushka i chai
A grandmother tells a story over tea. Imperfective aspect, family vocabulary, cultural warmth.
ILR 1 / Warm / 90 sec
Hindi
Chant
Retroflex rhythm
Rhythmic drill contrasting dental and retroflex stops. Da/Da, ta/ta — feel the tongue position change.
ILR 0 / Phonology / 80 BPM
Turkish
Scene
Buyuk Carsi'da
Bargaining at the Grand Bazaar. Vowel harmony in action, numbers, polite negotiation.
ILR 1 / Dialogue / 90 sec
Swahili
Song
Karibu nyumbani
Welcome home. Prenasalized stops woven into a warm folk melody. Noun classes in context.
ILR 0+ / Folk / 90 BPM
Thai
Chant
Ha siang Thai
Five Thai tones in a rhythmic ladder. Mid, low, falling, high, rising — sung in ascending difficulty.
ILR 0 / Phonology / 75 BPM
Vietnamese
Poetry
Mua xuan Hanoi
Spring in Hanoi. Six tones dance through imagery of blossoms and rain. Phonological beauty.
ILR 1 / 8 lines
Dutch
Scene
Op de fiets
Cycling through Amsterdam. Directions, weather, the guttural G in natural conversation.
ILR 0+ / Dialogue / 90 sec
Polish
Micro-story
Pierogi babci
A family recipe passed down through generations. Nasal vowels, food vocabulary, nostalgia.
ILR 1 / Warm / 90 sec
Greek
Song
Sto limani
At the harbor. A taverna melody with Greek rhythm patterns and maritime vocabulary.
ILR 1 / Folk / 95 BPM
Finnish
Chant
Pitkia ja lyhyita
Long and short vowels in rhythmic contrast. Tuli/tuuli, tapan/tapaan — length changes meaning.
ILR 0 / Phonology / 80 BPM
Hebrew
Scene
Ba-shuk
At the shuk in Tel Aviv. Haggling, tasting, the rhythm of pharyngeal consonants in market calls.
ILR 0+ / Dialogue / 90 sec
Indonesian
Micro-story
Warung di pagi hari
Morning at a warung. No conjugations, no tenses — pure SVO with time words. The gentlest entry.
ILR 0 / SliceOfLife / 60 sec
Ukrainian
Song
Pid zoryamy
Under the stars. Soft consonants and folk melody. Emotional expressiveness in every line.
ILR 1 / Ballad / 80 BPM
Zulu
Chant
Izinhlobo zamakliki
Click consonant drill: dental (c), alveolar (q), lateral (x). Three clicks in rhythmic variation.
ILR 0 / Phonology / 70 BPM
Georgian
Poetry
Tbilisi saghamo
Tbilisi evening. Ejective consonants and consonant clusters in verse. Ancient script, modern emotion.
ILR 1 / 8 lines
Persian
Micro-story
Chai-khane-ye ghadimi
The old tea house. Ta'arof (ritual politeness) in a narrative about hospitality and poetry.
ILR 1 / Reflective / 90 sec
47 languages
Every major language on Earth.
Each with a named AI trainer, phoneme inventory, cultural scenarios, and immersion content.
SpanishFrenchItalianPortugueseGermanDutchNorwegianSwedishDanishRomanianCatalanRussianUkrainianPolishCzechMandarinJapaneseKoreanHindiUrduBengaliTamilArabicHebrewPersianTurkishIndonesianMalayFilipinoThaiVietnameseFinnishHungarianGreekGeorgianIrishWelshSwahiliAmharicYorubaZuluHausaAfrikaansMaoriHawaiianMongolianEsperanto

The brain never stops learning.
Neither should your trainer.

Start with any language. No credit card. Every interaction metered in joules.

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