Effective date: July 8, 2026

CalcVault — Privacy Policy

CalcVault (on-device name "Calculator", bundle ID com.vanthuongdao.calcvault) is a private vault app with a calculator disguise. It opens as a fully working calculator; only after you enter your secret passcode does it reveal a private vault for photos, videos, files, notes, wallet entries, voice recordings, private contacts, and private-browser bookmarks.

This policy explains, in plain language, what data the app handles and what it does not. The short version: your vault content is encrypted on your device and never reaches us — there is no account and no server.

Your vault content stays on your device

CalcVault is offline-first and has no user account and no backend server of our own. Everything you put in the vault — photos, videos, documents, note text, wallet entries (card numbers, passwords, Wi‑Fi, 2FA codes, crypto seed phrases), audio recordings, private contacts, and browser bookmarks — is:

• Encrypted on your device with AES‑256‑GCM before it is written to storage, including thumbnails and sensitive metadata such as file names and titles.
• Protected by a key derived from your passcode (Argon2id) that is never stored in raw form and never leaves your device.
• Never transmitted to us. We operate no server that could receive it, and we cannot read it.

Because the encryption key is derived from your passcode, forgetting your passcode means the data cannot be recovered — by you or by us. There is no backdoor. The app warns you about this when you first set your passcode.

Analytics (anonymous)

CalcVault uses Firebase Analytics (Google) to understand which features and screens people use — for example, app opens, screens viewed, and generic actions like "opened the vault" or "changed a setting". This data:

• Is anonymous — a random per‑install identifier, never your name, email, or any vault content.
• Never includes the contents, file names, note text, contacts, or any item you store.
• Is never used for advertising, never sold, and never used to track you across other apps or websites.

Google's privacy policy governs how it processes this data: policies.google.com/privacy.

Purchases (Premium)

Premium is an optional subscription (Monthly, Yearly with a 3‑day free trial, or a one‑time Lifetime purchase). Prices in Vietnam are Monthly ₫49,000, Yearly ₫299,000, and Lifetime ₫599,000; prices vary by country/region and the exact price is always shown in the app before you buy. Payments are handled entirely by Apple's App Store — we never see your card or payment details. We use RevenueCat to manage subscription status; it stores your purchase state (which plan, active or expired) against a random app‑user identifier, not your name or email. This is used only to unlock the features you paid for and to restore purchases. See revenuecat.com/privacy and apple.com/legal/privacy.

No ads

This version of the app shows no advertisements and contains no advertising or tracking SDKs. If that ever changes, we will update this policy and the App Store privacy information before it takes effect.