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Soft Moon Lullaby · English → French

Press and hold to sing

Sing to Learn

A lullaby your family already sings — teaching a second language one held note at a time.

A family's second language usually dies quietly, one skipped bedtime at a time.

Most bilingual households start with real intention, and lose the second language within a generation. A classroom, or a generic language app, can only meet a child at one level for everyone in the room at once — which means it is wrong for most of the room, most of the time. The one ritual every tired parent already keeps — the bedtime song — gets treated as unteachable, simply because nobody looked at it as a lesson.

The turn

Sing the same lullaby you already sing — the words just arrive in two languages.

Press and hold, and a familiar melody plays while the lyrics cross-fade from the home language into the target language, one line at a time, exactly the way the house already sings it. The microphone listens while it is held, entirely on the device, tracking pitch and pronunciation to know how the singer is actually doing — never a quiz, never uploaded. Melody carrying new words into an old, trusted ritual is the whole bet: a lullaby a parent will repeat hundreds of times without ever feeling like homework.

How it works

  1. 01

    Open the Song Library

    Choose a lullaby from a shelf of eight, each one tagged with the language it's teaching — Soft Moon in French, River Sleeps in Japanese, Under the Fig Tree in Arabic, and five more.

  2. 02

    Sing it, out loud, at bedtime

    The child settles in, the parent presses and holds, and the room hears the same tune it already knows — just with new words riding on top of it.

  3. 03

    Pronunciation feedback appears mid-line

    A word that needs another night of practice glows softly rather than getting marked wrong — a gentle underline, not a red pen, because the point is another try tomorrow, not a grade tonight.

  4. 04

    The Level Map moves overnight

    Every session updates a five-step Level Map in the background: a strong night nudges the song up a level, a rough one holds it right where it is — never announced, never a test the child can fail in the moment.

  5. 05

    The Nightly Streak keeps the ritual honest

    A small flame on the home screen counts consecutive nights sung — the one number in the whole app that's about showing up, not performing.

A parent sings a lullaby at a child's bedside while luminous musical notes rise from their hands into the dark room.

The catalogue has grown past two dozen language pairs, but eight lullabies carry the whole product: Soft Moon (French), River Sleeps (Japanese), Little Star, Come Down (Italian), Grandmother's Hush (Portuguese), Sleep Boat (Korean), Under the Fig Tree (Arabic), Quiet Wings (German), and Home by Morning (Swahili) — each illustrated as its own song card in the house style, a small nightscape keyed to where the lullaby comes from. Every screen — the Song Library, the Level Map, the Nightly Streak, the pronunciation glow beneath a lyric — runs entirely on-device; nothing a child or parent sings ever leaves the phone. A parent's own voice is heard and leveled exactly like the child's, because the household, not the individual, is the unit the app is actually teaching.

Teaching at the right level

The Level Map has five named steps: First Hush (the song stays in the home language, one target word planted inside it), Half-Light (one full line arrives in the target language), Rising Moon (the whole chorus turns over), Wide Awake (only the hardest phrase still holds out in the home language), and Sung Through (the whole song, home language dropped). Nobody chooses a level by hand — the app moves a singer up or down the ladder itself from what it heard the night before, a night-by-night re-assessment no classroom of forty could manage for one child. That continuous re-leveling is a direct application of Teaching at the Right Level, an approach developed by the Indian NGO Pratham and evaluated across fifteen years of randomized controlled trials by J-PAL researchers — among the most cost-effective learning interventions ever measured, reaching more than eighty million children. source The mechanism is different — nightly audio instead of a classroom test — but the underlying argument is the one every venture in this portfolio makes the same way. See the full methodology Whether singing itself measurably speeds up second-language acquisition, beyond making the practice something a family actually keeps doing, is a question the company treats as open and worth researching properly — not a settled result to advertise as science.

Where it lives

Sing to Learn doesn't live in an office or a classroom — it lives in the ten minutes before a child's light goes out, in whichever house is singing that night. A typical week: Monday and Tuesday hold at Half-Light while a new line settles in; a rough Wednesday session and the app quietly holds the level rather than pushing forward; by Thursday the chorus turns over cleanly and Rising Moon unlocks; Friday and the weekend repeat it until it's easy, and by Sunday night the Nightly Streak reads seven — the only number either of them was ever chasing. The household, not any one learner, is what actually improves: a parent who once only hummed along is, by the end of most weeks, singing the new line first. That bedroom is only one half of the mechanic. Travelling Bands is designed to ride the same songs and the same level ladder into a school hall in person — the part a phone can't do alone — while this app is what keeps the lesson going once the trailer's pulled away. See Travelling Bands

What we don’t know yet

The company has not yet run or published its own independent study isolating how much of the effect is the singing and how much is simply that families keep doing it — that evidence gap is real, and worth closing before the claim gets bigger than the research behind it. The pronunciation model is stronger on languages with clear phonetic contrast to the home language than on tonal languages, where "close enough" is still generously judged rather than finely scored. Two singers usually share one phone — a parent and a child, most nights — so the Level Map currently tracks the household as a unit rather than perfectly isolating either person's individual pace, a trade-off the product accepts rather than hides.

Questions