Bai OS

AI note-taking with memory

Notes that take themselves. You send it. Bai files it — and brings it back. All in WhatsApp.

Voice, photo or text — dump it however it comes out. Bai sorts it, and recalls it when you need it, however you remember it.
No folders, no busywork.

Try Bai Go free → Then $9/month

Sign in with Google Bai lives on your WhatsApp Zero setup

Your data stays yours — export or delete anytime.

No app to open. No folders to make. You just talk.

"Hey Bai, how's the restaurant p"

→

One brain · Two windows

Talk to it on WhatsApp. Open Space when you want to think.

WhatsApp is enough — talk, forward, ask, recall. Space is the same brain on a bigger canvas: same memory, more room to think.

A WhatsApp / self-sufficient · save, ask, get answers
B Space / same brain · cleaner view, more room to think
Memory › This week
Search · "Atlas"
Sort · Recent A

Fresh from your WhatsApp thread

2 items · updated 2 min ago
Project · Brief Atlas Tomorrow 10am MARÍA · ATLAS

Atlas · Brief for tomorrow's sync with Sarah

Last sync (Aug 12) flagged 2 blockers. Pricing memo overdue 9 days. Sarah waiting on legal review and v2 wireframe feedback.

Last sync Aug 12 12 days ago
Open items 4 2 yours · 2 hers
Overdue 9 days pricing memo
Updated · 3:40 PM · from WhatsApp Open thread →
A
Voice note · 0:05 3:39 PM · WhatsApp
0:05
"Hey Bai, I have the Atlas meeting with Sarah tomorrow — give me a rundown of what's pending and what I owe her."
Bai noticed
Last time you discussed Atlas, Sarah flagged two blockers . One's been open 9 days — want to unblock it before tomorrow's call?
A · WhatsApp Self-sufficient. That's the point. Save anything — voice notes, links, photos, receipts. Ask Bai anything back. Search, summaries, follow-ups, all in the chat. You never need to leave to make it work.
B · Space Same brain. Easier on the eyes. When you want to sit with everything — read a long article, scrub a meeting, browse what you've saved — Space gives the chat room to breathe. Same memory, more comfortable surface.
· Either, both, neither No app. No new habit. Use just WhatsApp forever — Bai works fully there. Open Space the days you want a wider view. The brain is the same on either screen; you choose where to spend the time.
What Bai keeps for you

Every note, sorted and waiting.

You send it by voice, photo or text — Bai files it and brings it back, without you filing a thing.

📋

Projects

Tracks progress without you checking in.

💡

Ideas

Captures now, connects later.

❤️

Wellness

Remembers your habits, not just your requests.

👨‍👩‍👧

Family

Coordinates so you don't have to.

✈️

Travel

Plans around what you actually like.

💰

Money

Knows who owes you. Follows up.

…and anything else you can think of. Just say it.

Three steps · no folders

Note-taking with zero busywork.

💬

You send it

A voice note, a photo, a quick thought — straight into WhatsApp.

🧠

Bai files it

It sorts and tags each note and ties it to what came before.

✅

It recalls itself

Brought back however you remember it — sometimes before you even ask.

You talk. Bai files it.
No folders. No tags to set. No system to build.

What people say
C

Carlos M.

entrepreneur

"I stopped trying to hold everything in my head."

L

Laura S.

designer

"I capture ideas while walking and they're already sorted when I get back. Nothing slips anymore."

D

Diego R.

student

"My whole semester lives in Bai and I never set it up. It just remembered what mattered, in time."

Agent reactive

Gets it done, right when you need it.

Brain proactive

Remembers what matters and brings it back before you ask.

Pricing

Move forward without losing anything.

Prices in USD.

9 days free
Bai Go 9 days free

Your external brain on WhatsApp.

$ 9 USD/month

9 days free · then $9/month

Includes
  • Notes: create, search, archive, tag
  • Audio, images & voice transcription
  • Saved views, statuses & custom tags
  • Google Calendar — view & create events
  • Proactive reminders when they matter
  • Plenty of room for your notes, audio and files
Try Bai Go 9 days free →

Encrypted · Never sold · Delete anytime

Common questions

The short version.

Send Bai a note by voice, photo or text and it files and tags it for you. The difference from a plain notes app: Bai remembers. Details you saved weeks ago come back without you searching, and it reaches out first when something's time-sensitive.
No. No folders, no tags to set, no filing. You just send it and Bai does the sorting and the remembering. Sign in with Google, connect WhatsApp, and start.
Yes — that's the point. Send a voice note on the go, a photo of a receipt or a whiteboard, a PDF you don't want to read. Bai pulls out what matters and files it.
Yes. Data is encrypted in transit and at rest on Google Cloud infrastructure. We never sell or share your information, and you can export everything or request permanent deletion anytime from your portal.
Ready when you are

Stop filing your notes.
Start being reminded of them.

Try Bai Go — 9 days free →

Your move.