Koe · an AI companion that sounds like your child

She opens her phone.
Your voice is right there.

Koe is a daily companion that sounds like you. Your mother taps once — the voice she raised you with greets her, plays a logic puzzle, asks how the morning went. The moment she opens it, your phone hears about it.

MVP · 2026 From ¥980 / monthiOS · Android
9:41 ●●●●  Wi-Fi  ■
おはようございます
Kenji
Your son Online now
On her phone Large text. Three taps. The voice she trusts, whenever she's ready.
she opens it when she wants · and a voice she trusts is already there
01 / How 仕組み

A short voice setup. The rest is simple, for her.

Once you record your voice, Koe lives quietly on her phone. She opens it when she wants — usually morning, midday, evening. Every session gives her something to think about and gives you something to hear back.

one.

Lend us your voice for six minutes.

Read the Koe passage aloud. We build a model of how you sound — your warmth, your pauses, the way you say her name. Up to three children, one voice each.

two.
Morning · greeting8:30 AM
→ Midday · gentle nudge12:45 PM
Evening · wind-down6:15 PM
Today's puzzleLogic Q · garden

She opens Koe on her own time. Three gentle moments a day.

A morning greeting when she wakes. A quiet midday nudge if she has not checked in. Evening wind-down. Always parent-triggered, never forced. Sessions cap at 15 minutes.

three.
Mom · just opened Koe
📲 9:14 AM · session in progress
Recap · 11 min later
Talked about the garden. Logic Q completed. Mood: warm. She wants a photo.

Every session reaches you, the moment it begins.

WhatsApp or SMS the second she opens Koe. A short recap when she is done — what she talked about, how she sounded, what to follow up on. Daily presence. No daily call required.

02 / Check-ins 見守り

You hear about every session the moment it begins.

Every time she opens Koe, your phone hears about it — WhatsApp or SMS, instantly. After each session, a quiet recap: what she talked about, what she puzzled over, how she sounded. No call required — but if something matters, you call back, in your own real voice.

9:14 Mom opened Koe. Morning greeting played.
+0:30 Spoke for 11 minutes. Topic: garden, neighbors, the rain.
+11:42 Logic Q — medium difficulty puzzle. Completed.
Mood Warm · energy steady · no concerns flagged.
Follow-up She wants you to send a photo of the dog.
◍ Pushed to your phone in real time

Silent presence.
Daily updates.

A notification: Mom just opened Koe. A short recap when she's done. Family-tier check-ins go to as many children as you enroll, by SMS or WhatsApp. Premium adds engagement analytics so a drop in calls doesn't slip past you.

Today · 1 session Streak · 11 daysFlags · none
A note from our founders

My mother lives in Bolivia. I live in Tokyo. We're separated by every conceivable thing — eleven time zones, two languages, the whole shape of the Pacific. I call her on Sundays. She says, 'It's enough, mijo,' and we both know it isn't.

Jonathan and I built Koe for the days the call doesn't happen. It is not a replacement — I know that, my mother knows that, and Koe is built to remind her of that every time she opens it. It's a voice she trusts, sitting quietly in her phone, available whenever she wants it. And when she opens it, my phone tells me. I call back, when I can. Sometimes I find out she had a good morning before I knew to ask.

If you're reading this, some version of this distance is yours too. We're glad you're here.

Sergio, co-founder · Tokyo
04 / Questions Q & A

The hard ones. Asked and answered.

Is cloning my voice for my mother… weird?

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It's a fair question. We require opt-in written consent from both you and your parent before any cloning. Koe identifies itself at the start of every session — "This is Kenji's Koe" — and the visual AI badge stays on screen the whole time. Either of you can revoke and delete the voice model at any time.

Could my mother get dependent on the AI?

+
We cap each session at 15 minutes a day, and every recap actively prompts you to call back. Koe is built to bridge the gaps between real calls — not to replace them. Premium-tier analytics flag drops in engagement so a quiet week doesn't slip past you.

What if she's in crisis?

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Distress language — pain, danger, hopelessness — pauses the session instantly and notifies you within seconds, with local emergency resources for Japan. Topics like finance, legal, and medical advice are always blocked. Koe is companionship, never advice.

Where does the audio go?

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Everything lives on AWS Tokyo with APPI-compliant data handling. Voice clones are generated from a six-minute sample and tied to a single enrolled parent. We are a registered GK entity in Japan with Japanese legal counsel from day one. Anonymised aggregate data only.

What does it cost?

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Three tiers, billed per family, not per user. Basic ¥980/month — single voice profile, unlimited conversations, brain exercises. Family ¥1,980/month — up to three children's voices, WhatsApp + SMS check-ins, session recap digests. Premium ¥3,480/month — unlimited voices, engagement analytics, dedicated phone support. Cancel anytime.

Which languages does Koe speak?

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Japanese at launch. Korean, Mandarin, English, and Spanish are on the 2027 roadmap. We will only ship a language when the voice clone is genuinely indistinguishable from a real voice — which varies by language and dialect.

Be one of the first
100 families.Help us prove this works.

We're opening Koe to thirty-four families to start, growing to a hundred by year-end. Leave your email and we'll reach out when there's a seat for you.