Kai
A contemplative thinking partner
Kai is Mindfulness Inc.'s contemplative AI companion: a thinking partner for reflection.
Kai is now in public testing. The iPhone app, the web and WhatsApp all open onto the same conversation, and access is by request.
Sign inWhat Kai is for
Thinking something through rather than getting something done. Kai is a companion for reflection: a place to slow a question down, look at what is actually being asked, and stay with it. The conversation goes at the pace of the person having it.
What Kai is not
Kai is not a productivity assistant. Kai is not a therapist. Those are different jobs, and Kai does neither.
Step 1: get your login
Every door uses the same account, so this comes first. The quickest way is WhatsApp: send the word app to Kai at +31 6 53394474. Kai asks for your email address and your sign-in details arrive there within a few minutes. During the test there is no waiting for approval.
Get your login on WhatsAppNo WhatsApp? On the Kai site, choose New here? Create account, verify your email with the code you receive, and tell us in a few words how you found Kai. A person reviews these requests, so this route takes longer; you get a mail when it is approved.
Request access on the web →Already have an account from an invitation? Sign in with it; the email with your temporary password is the one to use first.
Step 2: choose your door
iPhone app (public test)
The app is in public testing through Apple's TestFlight. Open the link below on your iPhone, install the TestFlight app if you do not have it, and accept the invitation. TestFlight lists the app as Kai Dev for now. Sign in with the account from step 1. In the app you can talk with Kai by typing or by speaking.
Join the iPhone testhttps://testflight.apple.com/join/KBUaXcRC
Web
The same conversation in a browser, on any device, at app.kai.mindfulnessinc.org.
Message Kai at +31 6 53394474 from the phone number your login belongs to. The thread is shared with the app and the web.
While it is in testing
What helps most is to use Kai the way you would really use it and to say what you notice: where it helps, where an answer misses the mark, anything that breaks or feels off. Use the feedback button in TestFlight, or write to us below.
Everything Kai remembers is yours to export or delete whenever you choose, from Account settings.
Kai is one of a small family of mindful AI companions, each built to support a clear mind rather than compete for it; DelsonAI, a dhamma companion in Delson Armstrong's method, is another. For using Kai in a course or with a team, start with a note.
Get in touch →What's new in Kai
23 Oct 2026 · Test release 9
In Settings you now pick your companion's voice from a female and a male voice, or its own voice where it has one, and each is marked as such.
iOSAndroid
23 Oct 2026 · Test release 9
Settings has a new overview card on top that shows your language, voice, reply length and app lock at a glance, and the language list now opens on a tap.
iOSAndroid
23 Oct 2026 · Live update
You can now tell your companion in chat which days and hours it may check in with you, and it checks in at most once a day.
iOSAndroidWeb App
23 Oct 2026 · Live update
In the browser, the tab for your companion's web app now shows its own icon.
Web App
23 Oct 2026 · Live update
The web app now shows your companion's own icon on your home screen and when installed, the same picture as the phone app.
Web App
20 Oct 2026 · Live update
You can now pick a female or a male voice for spoken replies in each language, including a male voice in Dutch.
iOSAndroid
20 Oct 2026 · Live update
The microphone now understands you when you speak Polish, and also Greek, Russian, Turkish, Ukrainian and other languages it missed before.
iOSAndroid
18 Oct 2026 · Test release 8
In Settings you can now choose the language your companion speaks with you, and the voice list follows your choice.
iOSAndroid
18 Oct 2026 · Test release 8
You can now start a new chat, see your earlier chats, pick one up again or delete it.
iOSAndroid
18 Oct 2026 · Live update
When you are given access, you now get an email that tells you how to sign in.
iOSAndroidWeb App
17 Oct 2026 · Live update
Kai's web app now lives at app.kai.mindfulnessinc.org.
Web App
17 Oct 2026 · Live update
Kai now has one public page at kai.mindfulnessinc.org, with a Sign in button that takes you to Kai on the web.
Web App
| Date | Release | What's new | iOS | Android | Web App |
|---|---|---|---|---|---|
| 23 Oct 2026 | Test release 9 | In Settings you now pick your companion's voice from a female and a male voice, or its own voice where it has one, and each is marked as such. | yes | yes | no |
| 23 Oct 2026 | Test release 9 | Settings has a new overview card on top that shows your language, voice, reply length and app lock at a glance, and the language list now opens on a tap. | yes | yes | no |
| 23 Oct 2026 | Live update | You can now tell your companion in chat which days and hours it may check in with you, and it checks in at most once a day. | yes | yes | yes |
| 23 Oct 2026 | Live update | In the browser, the tab for your companion's web app now shows its own icon. | no | no | yes |
| 23 Oct 2026 | Live update | The web app now shows your companion's own icon on your home screen and when installed, the same picture as the phone app. | no | no | yes |
| 20 Oct 2026 | Live update | You can now pick a female or a male voice for spoken replies in each language, including a male voice in Dutch. | yes | yes | no |
| 20 Oct 2026 | Live update | The microphone now understands you when you speak Polish, and also Greek, Russian, Turkish, Ukrainian and other languages it missed before. | yes | yes | no |
| 18 Oct 2026 | Test release 8 | In Settings you can now choose the language your companion speaks with you, and the voice list follows your choice. | yes | yes | no |
| 18 Oct 2026 | Test release 8 | You can now start a new chat, see your earlier chats, pick one up again or delete it. | yes | yes | no |
| 18 Oct 2026 | Live update | When you are given access, you now get an email that tells you how to sign in. | yes | yes | yes |
| 17 Oct 2026 | Live update | Kai's web app now lives at app.kai.mindfulnessinc.org. | no | no | yes |
| 17 Oct 2026 | Live update | Kai now has one public page at kai.mindfulnessinc.org, with a Sign in button that takes you to Kai on the web. | no | no | yes |