> ## Documentation Index
> Fetch the complete documentation index at: https://docs.burakov.net/llms.txt
> Use this file to discover all available pages before exploring further.

# FAQ

> Common questions about Tidybook — platforms, accounts, whether it touches your phone's contacts, importing from other services, privacy, and backups.

## Which platforms does Tidybook run on?

iPhone, Android and the web. Your account carries your book across all of them.

## Do I need an account?

No. Import, deduplicate, clean up and edit all work with **no account**, fully on one device. An
account is only needed for the **Sync** plan (multi-device sync and cloud backup). If you sign in
later, the book you already built is adopted into your account.

## Does Tidybook change my phone's contacts?

No. Tidybook **reads** your phone's address book to import it, then keeps its own canonical book. It
does not modify your phone's contacts.

## Can I import from Google, iCloud or Outlook?

Yes — export a **vCard (.vcf)** or **CSV** from that service and import the file into Tidybook. That
covers essentially every contacts source today.

## Is it really private?

Yes. When Sync is on, your contacts are **end-to-end encrypted** before they leave your device; the
server only ever stores ciphertext and can't read a name or number. Turn on the passphrase lock and
it becomes **zero-knowledge** — not even Tidybook can decrypt your book. See
[Sync & encryption](/tidybook/sync-and-encryption).

## What happens if I forget my passphrase?

If you enabled the zero-knowledge passphrase lock and lose both the passphrase and your recovery
code, your synced book **cannot be recovered** — that's the point of zero-knowledge. Always keep a
vCard / CSV export as an independent backup before enabling the lock.

## How do I back up my contacts?

Export to **vCard** or **CSV** at any time. It's a plain, portable file that opens anywhere and
belongs entirely to you, independent of any account.

## How much does it cost?

Buy Tidybook once for **$9.99** to use every on-device feature. Optional cloud **Sync** is **$7.99 /
year**. No subscription is required to use the app. See [Pricing](/tidybook/pricing).