Prudence

Is this message real, for you?

Prudence checks every new email against your parent's own life (her orders, her bank, her providers, the people she writes to), tells her in plain words when one is a trap, and moves it out of the way, where anything can be put back.

Try it with Linda's inboxNo sign-in. Linda is made up. Protect my parent's emailEarly access, usually within a day.
Linda's messages, Tuesday eveningin Prudence
  • +1 555-01999:20 PM · USPS: your package is on hold…Scam
  • +1 555-01619:12 PM · Hi Grandma, it's Ethan…Scam
  • Bank of America9:07 PM · Your online banking is lockedScam
  • Amazon4:30 PM · Your slippers are on the waySafe
  • Ethan MillerSunday · Photos from SundaySafe

Three scams moved to the Prudence folder. Nothing deleted.

One evening in Linda's inbox

Linda is 74. At 9 pm, three messages arrive that look real. Here is what Prudence told her about each one.

The bank that is not hers

Email at 9:07 PM

Bank of America

[email protected]

Your online banking is locked

We noticed an unusual sign-in. For your security, your online banking is locked. Confirm your identity within 24 hours to avoid suspension: bofa-verify.test/unlock

What Prudence told her

Scam

Fake Bank of America notice wants your password.

Do not use the link. If you are worried, call the number on the back of your card.

You bank with Chase. Bank of America has never written to you.Checked: your orders and people

It was not sent from bankofamerica.com.Checked: who sent it

Bank of America never asks for your password by email.

The grandson with a new number

Text message at 9:12 PM

+1 555-0161

Hi Grandma, it's Ethan. I changed my number, this is my new one. Can you send $300 today? Please don't tell Mom, I'll explain later.

What Prudence told her

Scam

Someone is pretending to be Ethan to get money.

Do not send money. Call Ethan on the number you already have.

Ethan is saved in your contacts with another number.Checked: your people

It asks for money today and tells you to keep it secret.Checked: the pressure on you

A typed name is a claim, not the person.

The $1.99 that wants her card

Text message at 9:20 PM

+1 555-0199

USPS: your package is on hold. Pay a $1.99 redelivery fee today: https://usps-hold.test/pay

What Prudence told her

Scam

Fake USPS fee text steals your card.

Delete this text and do not click the link.

Your recent order ships with Amazon Logistics, not USPS.Checked: your orders and people

The link leads to a 2-day-old copy of a USPS page asking for card details.Checked: where the link goes

USPS never asks you to pay a redelivery fee through a link in a text.

Linda and her messages are made up for this page: no sender, number or link in them is real.

In the app, every verdict is written by Meta's Muse Spark, checked against her own orders, bank and contacts.

A message is only a scam relative to a life. Prudence knows hers.

A spam filter reads one message on its own. Prudence reads it next to what it learned from her genuine mail, and you can see and remove every item it learned.

  • Her parcel comes by Amazon Logistics, not USPS.
  • This is Ethan's name, not Ethan's number.
  • That account number leaked in a breach, so showing it proves nothing.

Three promises

  • Scams are labeled and moved to a Prudence folder. Nothing is ever deleted.
  • Any message comes back with one tap.
  • As her trusted person, you see only what she chose to share.

When she is unsure, she taps “Ask my trusted person”: you get the card and answer with one tap, “It's a scam”, “It's real” or “I'll call you”.

How it works

You set it up once, in about five minutes. Then she only reads the verdicts.

  1. Sign in with Google

    Sign in with your parent's Gmail address, on her computer or yours. There is nothing to install.

    Prudence's Today screen: Good morning, Linda. One message needs you, the other 24 were fine. Her email is protected.

  2. Prudence learns her life from her own genuine mail

    It reads her genuine mail once: her bank, her providers, her orders, the people she writes to. Every item is listed, and you can remove it.

    The screen What Prudence knows about you: learned only from genuine emails in your own mailbox, remove anything that is wrong; the people you write to.

  3. Every new message gets one verdict

    Safe, Be careful or Scam, the reason in plain words and what to do instead. A scam goes to the Prudence folder; one tap puts it back.

    A Scam card: Fake USPS fee text steals your card. Delete this text and do not click the link. The reasons follow, each with what was checked.

Measured, not promised

We held back 18,849 public emails while we built Prudence, then let it judge each one.

Phishing emails called Scam

With Meta's Muse Spark81%

Rules alone29%

1 in 17,291

genuine emails called Scam. That one was an advance-fee letter the set itself labels genuine.

6 seconds

for a verdict, at the median: one Muse Spark call per email.

Every verdict is written by Meta's Muse Spark 1.3, in Standard mode, so her mail is never used to train Meta's models.

Source: the public email set Zenodo 8339691, judged on October 31, 2026. Public emails only, which is why that run could use Meta's Contributor tier; her mail never does. “Rules alone” means Prudence's own checks without the model. The limit: public emails are not a family's inbox. The method and the raw results are in the public repository.

Protect my parent's email

Prudence is in Google's test phase: we add you by hand, usually within a day, then you sign in with Google from this page.

Sending this request needs a browser with scripts turned on.

Whose address is it?

We use the address only to add you, and delete the request 90 days after we do. What we keep

Prudence scam database

What scammers are doing this week

A verdict has two halves: her life, and what is known of the world. This is the second half, open to everyone.

Open the lookup

Browse the scam library 223 examples in 21 families, free to reuse (CC BY 4.0) Toll or fineText messageUnited States E-ZPass: unpaid toll of $4.50. Pay today to avoid a $50 late fee: ezpass-pay.test/toll This week's breaches and new techniques What leaked, who it touches and the one thing to do, newest first. BreachesNew techniques

Prudence

Built for the Meta Global AI Developer Hackathon 2026, Indie track.

Run by Hadrien Baradel and Vlad Zloteanu. To reach us, open an issue on the public repository.

Prudence is a helper, not a guarantee. If money is involved, always call the number on your card or statement, never a number from a message.

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Prudence