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A CURRENT ONLINE ADDRESS BOOK

An online address book that does not go stale.

Most address books store a snapshot. OnceAsk is built around the person behind the address, so the mailing information you rely on can stay useful when that person moves.

Create your OnceAskSee how OnceAsk works
Addresses change.A good address book should tell you where someone can receive mail now, not where they lived years ago.

Bring your contacts together

Import the people you already know, identify missing mailing addresses, and keep the details that matter for physical mail in one clean address book.

  • Import existing contacts
  • See who is missing an address
  • Avoid duplicate manual lists

Let people maintain their own address

Instead of treating a mailing address as a permanent field, OnceAsk lets the owner of that address confirm and update it. That creates a much better source for future cards, gifts, and invitations.

  • Recipient-confirmed information
  • Current-address model
  • Fewer returned or misdirected mailings

Useful to people and assistants

Your address book remains a consumer utility first, while OnceAsk can also provide a current, permissioned address layer for compatible AI assistants and delivery workflows.

  • Human-readable contact management
  • AI-native address resolution
  • Permission-aware delivery

HOW IT WORKS

Ask once. Keep the result useful.

1

Import your people

Start with the address book or contacts you already have instead of creating another list from scratch.

2

Fill the gaps

Ask contacts with missing or outdated mailing information to confirm their current address.

3

Stay current over time

When a contact moves, their updated OnceAsk address can keep your relationship current.

BUILT FOR PEOPLE + AI

Addresses should be live data, not a stale field in a contact card.

OnceAsk gives people one current address to maintain and gives compatible assistants a permissioned way to resolve or request the delivery information they need.

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QUESTIONS

What to know

Is OnceAsk a free online address book?

OnceAsk is free for consumers and is designed to organize mailing-address relationships, request missing addresses, and keep them current over time.

How is this different from storing an address in Contacts?

A standard contact card stores whatever address was entered last. OnceAsk is designed around recipient-confirmed current addresses and update relationships rather than a static field.

Can I use my OnceAsk address book for mailing lists?

Yes. Current mailing addresses can support holiday cards, invitations, gifts, and other physical-mail workflows.

RELATED

More ways to use OnceAsk

Collect mailing addressesGather missing addresses with a simple request flow.Self-updating address bookSee how current-address updates change the usual address-book model.Keep addresses updatedReduce stale mailing information when people move.AI agent address bookUse current address relationships in assistant workflows.

Collect it once. Keep it current.

Build an address book that is still useful the next time you need it.

Create your OnceAsk