Early free preview
A small, warm pet that notices if you go quiet.
Visit Nuku for thirty seconds a day. If you stop for two days, it goes for help: the people you chose get a quiet nudge to check in on you.
Meet your NukuHow the alert works
Runs in your browser · no account, no email · for adults 18+
What Nuku is
Nuku is a small AI virtual pet for adults who live alone or live with anxiety. You visit it once a day to feed it, pet it, play, or breathe with it for a minute. That visit is your check-in. If you don't check in for 48 hours (you choose 24 to 72), Nuku lets up to five people you picked know, through a notification on their phone.
The name comes from the Japanese nukunuku: warm and snug.
Thirty seconds a day. Everything else is optional.
- one
Say hello
Feed, pet, play, or breathe with Nuku: its belly rises and falls at six breaths a minute, and you follow along. One tap counts as today's visit.
- two
Talk, if you like
Nuku listens, keeps replies short and remembers small things ("how did the interview go?"). It often asks about the people in your life, and nudges you to message them.
- three
Then go live your day
After a long chat Nuku gets sleepy and says goodnight. It is a small friend for a minute or two, not something to stay inside.
When you go quiet, Nuku goes for help
Many people who live alone have no one who would notice a bad week. Nuku is a gentle way to make sure someone would. The timer runs on our server, so it works even when your phone is off.
- Your last visitThe timer starts. Any visit, even one tap, resets it.
- About 36 hoursIf you allowed notifications: one gentle "Nuku misses you, tap to say hi."
- 48 hoursYour guardians each get one notification: you haven't checked in, maybe check in on you.
- You come backNuku is just glad to see you. No lost progress, no guilt.
| Window | 48 hours by default; you pick 24 to 72 |
|---|---|
| Guardians | Up to 5. Each one accepts through a link first. |
| How they're told | A notification on their phone or computer (Web Push). No app, email or phone number. |
| Going away? | Vacation mode pauses the timer for up to 60 days. |
| Price | Free. Alerts are never behind a paywall. |
| What it is not | Not an emergency service. Nobody is dispatched and no location is shared. |
What Nuku will never do
- Die, get sick or suffer. Left alone, it only gets sleepy.
- Count streaks. There is a "days together" total that never resets.
- Show ads or track you. No ad networks, no tracking pixels, no selling data.
- Pretend to be a person. It says it's an AI when you start a chat, and again every three hours.
- Guilt you into staying. No "don't leave me". Goodbyes are happy.
- Keep what you want gone. One button deletes your pet and everything it remembers.
If you're struggling right now: in the US call or text 988; in the UK and Ireland call Samaritans on 116 123; anywhere else, findahelpline.com lists free lines. If you are in danger, call your local emergency number. How Nuku handles this.
Questions
Something else? Write to support@jestr.ai. A person reads it.
Is Nuku free?
Yes. Nuku is an early free preview. The pet, the daily check-in and the alerts to the people you choose will always be free; if we ever add paid extras, safety alerts and crisis help stay outside any paywall.
Do I need an account?
No. Your pet lives on our server and your browser keeps a secret key to it. No email, phone number or name is needed. Clearing your browser data loses the key, so the pet can't be reached from that browser again.
What happens if I stop visiting?
Nothing bad happens to Nuku: it never dies, gets sick or loses progress. It just gets sleepy. If you allowed notifications, it sends you one gentle "Nuku misses you" after about 36 hours. After 48 hours (you can pick 24 to 72) the people you chose as guardians get one notification so they can check in with you.
Is this an emergency service?
No. Nuku tells the people you picked that you've gone quiet; it does not call anyone, track your location or send help. If you are in danger, call your local emergency number. In the US you can call or text 988; in the UK and Ireland, Samaritans are on 116 123.
Is Nuku a therapist?
No. Nuku is an AI pet, not a person, a therapist or a medical device. It can be a calmer moment in your day and a nudge to reach out to people. If you talk about wanting to hurt yourself, Nuku steps out of the game and shows you a real crisis line.
How do guardians get alerts?
You send them a link. They open it, see who invited them and what it means, and allow notifications on their phone or computer. No app, email or phone number is needed. On iPhone they add the page to their Home Screen first (iOS 16.4 or later).
Who can use Nuku?
Adults, 18 and over. Nuku is built for people who live alone or live with everyday anxiety, and for anyone who would like a small, kind routine.
Who makes Nuku?
Jestr, a small team at Duke Security, Inc. Questions go to support@jestr.ai.
What's in the preview
This is an early version, free while we learn. It has the pet, the daily visit, breathing together, short chats with a memory for small things, the guardian alert, vacation mode and full deletion. It runs in a modern browser on phones and computers; Chrome, Edge and Firefox work best, and Safari on iPhone is still being tested.
Nuku is a companion for everyday stress and quiet days. It is not therapy, not a medical device and does not diagnose, treat or prevent any condition.