can you keep a secret?
{{ typingDots }} Mum

Mum’s
the word.

A private AI assistant that lives in your Signal chats. It plans the trip, books the table, sorts the receipts and finds it cheaper. And it tells no one. Not even us.

End-to-end encrypted · Nothing stored · Never trained on you
What you’ve already said

You’ve told your AI things you wouldn’t tell your mum.

{{ q.text }}{{ q.stamp }}

Most AI assistants keep what you type. Conversations can be saved, read by reviewers and used to train future models, all tied back to you.

Keep scrolling. Watch it wash away.

Mum keeps none of it.

Your chats stay on your phone, in Signal. Nothing is kept on our side to sell, leak or hand over.

No chat history
Nothing you say is stored on our servers.
No record of who or when
Mum doesn’t log who you talk to, when, or where from.
No training on you
Your words never teach anyone’s AI.
Mum, in Signal

Now tell Mum.

Mum lives in Signal, the private messaging app. Message it like a friend, or add it to any group and tag @mum when you need a hand with a trip, a budget, a booking or a plan.
Everyone in the chat sees what Mum says. Nobody outside it does, including us.
{{ a.l }}
{{ chat.title }}
{{ chat.sub }}
Sealed
Messages are end-to-end encrypted
{{ m.from }}
{{ m.text }}
{{ m.pre }}{{ m.mention }}{{ m.post }}
{{ m.a }} ⇄ {{ m.b }}
{{ m.line }}
Mum
{{ m.text }}
{{ o.n }} {{ o.name }} {{ o.meta }} {{ o.price }}a night
{{ m.title }}
{{ r.label }} {{ r.amount }}
Total {{ m.total }}
{{ m.note }}
Payment request{{ m.card }}
{{ m.amount }}
{{ m.what }}
✓ Approved by you
Declined. Nothing charged.
{{ typingName }}
{{ typingDots }}
{{ typingDots }}
{{ composerText }}{{ caret }}
↑
1920 × 1080
Mum’s browser window. The most common screen size on earth.
Out on the web

Lost in the crowd, on purpose.

Mum can research, compare, book and buy for you, without ever going as you. Every visit is anonymous, and Mum’s browser uses the world’s most common screen size, so to any website it looks like one more visitor among millions.

Research
“Explain these three mortgage offers in plain English.”
Done, with the catch in offer two flagged.
Bookings
“A quiet table for six on Saturday.”
7:30 at Ondine. Confirmed.
Trips
“Lisbon for four, under €200 a night.”
Casa Azulejo, booked and split four ways.
Commutes
“The trains are down. Fastest way in?”
Bus 214, then a short walk. 34 minutes.
Shopping
“Same dog food, cheaper, by Thursday.”
£8 less, arriving Thursday.
Payments

Quick to pay. Never without you.

Keep your logins and cards in Mum’s encrypted vault and checkout takes seconds. But Mum can’t spend a penny until you say so.

01Sealed in your own vault, readable only by your Mum.
02Every payment waits for your approval.
03Decline anything, and nothing is charged.
Mum
Payment request
Lisbon, June
€736.00
Casa Azulejo, Lisbon · 4 nights, 12–16 June
Pay withVisa •••• 4417
Card kept inYour sealed vault
Split4 ways · €184 each
✓ Approved by you
Mum’s booking it now.
Declined. Nothing was charged.
Mum let it go.
How it stays private

Built so even we can’t look.

Plenty of companies promise not to read your chats. Mum is built so we couldn’t, even if someone asked us to.

Your Mum’s sealed computer No door · No logs · No way in
01A sealed computer

Your Mum runs on its own sealed computer, its memory scrambled by the chip itself. Nobody can log in or look inside, including us. There are no logs to read.

02Keys for the public code only

The chip proves exactly which software is running. Your keys only unlock for the version that’s published for anyone to inspect.

03No quiet changes

Every update is posted publicly and waits seven days before it can go near anyone’s keys. If something changes, everyone sees it coming.

04Sealed from your phone to Mum

Messages stay encrypted all the way from your phone into Mum’s sealed computer. Mum’s Signal key is made inside it and never leaves.

05The AI can’t peek either

Mum’s thinking happens on verified private hardware, so the company hosting the AI can’t read your conversations either.

Don’t take our word for it.

Ask Mum for proof whenever you like. It replies with a file signed by the chip itself, naming the public code that holds your keys. Anyone can check it with the open verifier, and Signal will tell you if Mum’s key ever changes.

Read the technical details →
Mum
Sealed
Try it. Ask Mum to prove your chat is sealed.
@mum prove it
{{ typingDots }}
Proof of seal
Signed by the chip · just now
a91f 07c2 5be3 … 9d0c e44b
✓ {{ c.label }}
All four checks passed. Your chat is sealed, and the proof is yours to keep.
Your account

No name. No email. Just a number.

Here’s what one looks like
{{ acct }}

Mum never asks who you are. You get a random account number, and that’s all we know. Lose it and the account is gone for good. We can’t recover it, because we have no idea whose it is.

Write it down. Keep it somewhere safe.
Pricing

Privacy isn’t a paid extra.

Every plan gets the same sealed, private Mum. The only difference is how much Mum can do for you each week.

Free
$0 / month
100M tokens a week
Everything Mum does, free.
Start free
Plus
$20 / month
500M tokens a week
5× the Free allowance.
Choose Plus
Pro
$100 / month
3B tokens a week
30× the Free allowance.
Choose Pro
On every plan
Including Free.
✓Lives in your Signal chats
✓Group chats with @mum
✓Mum-to-Mum planning
✓Research, bookings, trips, commutes and shopping
✓Encrypted vault for logins and cards
✓Your approval before every payment
✓Sealed computers, no logs, no training on you
✓Proof on request
Allowances reset every week. Prices in US dollars. What’s a token?
FAQ

Questions, answered.

Yes. Mum lives in Signal, the free private messaging app for iPhone, Android and desktop. If you already have Signal, you’re one message away.

No. Mum only sees the chats it’s part of: your own chat with Mum, and any group you add it to.

A token is a small piece of text, roughly three-quarters of a word. Mum counts tokens for everything it reads and writes for you, including the web pages it reads while working on a task. Your allowance resets every week.

Your account is gone for good. We never know who an account belongs to, so there’s no way for us to recover it. Write the number down and keep it somewhere safe.

Only when you say so. Mum asks for your approval in the chat before every payment, and if you decline, nothing is charged.

No. Nothing you say is used to train any AI model.

Ask Mum for proof. It replies with a file signed by the chip, naming the public code that holds your chat’s keys, and anyone can check it with the open verifier. See how Mum works.

Go on.
Tell Mum.

Private AI that lives in Signal. It’s ready when you are.

Message Mum on Signal →
Works wherever Signal does: iPhone, Android and desktop