Privacy Policy
Your privacy is our highest priority. This policy explains exactly what data we access, how it is protected, and your rights — written in plain language.
Information We Collect
01Calculator Vault is built on a zero-server, zero-upload principle. We do not operate any backend servers that receive your personal data. Here is the complete picture of what the app works with:
- Media files you choose to hide — photos, videos, audio files, and documents selected by you. These are encrypted and stored exclusively in the app's private, sandboxed storage on your device.
- Intruder selfies — photos silently captured by the front camera when an incorrect password is entered. These images are stored encrypted inside the vault only — never uploaded or shared.
- Your vault password / equation — stored locally using secure hashing. We never have access to your password.
- Device diagnostics (anonymous) — minimal crash and performance data collected by analytics to help us fix bugs. This never includes your files, photos, or vault contents.
We do not collect your name, email, phone number, location, browsing history, or any identifiable personal information.
Permissions Requested & Why
02Calculator Vault requests only the permissions necessary for its core security features. Below is a full, transparent breakdown of every permission and its exact purpose:
You can revoke any permission at any time via: Settings → Apps → Calculator Vault → Permissions. Note that revoking a permission will disable its associated feature.
Military-Grade Encryption & Local Storage
03Every file you hide in Calculator Vault is protected using AES-256 GCM encryption, implemented via the AndroidX Security Crypto library. This is the same encryption standard used by military organizations, financial institutions, and governments worldwide.
Here is what this means in practice:
- All files are encrypted before being written to storage — even if someone physically accesses your device, browses it with a file manager, or connects it to a computer, they cannot read your hidden files.
- Encrypted files are stored in your app's private sandboxed directory, inaccessible to other apps on the device.
- Your vault password is never stored in plain text — it is processed through a secure one-way hashing algorithm.
- The Decoy Vault uses a separate password and encryption key, allowing you to safely show an empty vault under duress without exposing your real files.
All encryption and decryption operations occur entirely on your device. No encryption keys, passwords, or file contents are ever transmitted to any server or third party under any circumstance.
Break-In Alerts & Intruder Selfie
04When someone enters an incorrect password on the calculator screen, Calculator Vault silently captures a photo using your device's front-facing camera. This photo is saved as an encrypted intruder log inside your vault.
Important details about this feature:
- Intruder photos are encrypted using AES-256 GCM immediately upon capture and stored only inside the app's private vault storage.
- These photos are never uploaded, shared, or transmitted to any server, cloud service, or third party — they are yours alone.
- They do not appear in your device's public gallery or camera roll.
- You can view, download, or delete intruder logs at any time from within the vault.
- This feature requires Camera permission. You can disable the Break-In Alert feature in app settings if you do not wish to use it.
Decoy Vault
05Calculator Vault includes a Decoy Vault — a secondary vault protected by a separate password. If you are ever forced or pressured to open the app in front of someone, you can enter the decoy password instead of your real one. The app will open to show the decoy vault, which can be kept empty or populated with harmless files.
Your real vault and its contents remain completely hidden and inaccessible when the decoy password is used. The app gives no visible indication that a real vault exists.
The decoy vault data is also stored encrypted locally on your device with the same AES-256 GCM standard and is never transmitted anywhere.
Analytics & Third-Party Services
06We use minimal, privacy-focused analytics solely to monitor app stability and fix crashes. This helps us deliver a more reliable experience.
What analytics may collect:
- Device ID — an anonymous identifier used to distinguish devices for crash reporting.
- Device Model — e.g., Samsung Galaxy S24, Pixel 8, used to reproduce device-specific bugs.
- OS Version — the Android version on your device, used to ensure compatibility.
- App Version — the installed version of Calculator Vault, used to trace issues to specific releases.
- Crash reports and error stack traces — logs generated when the app encounters an unexpected error.
- General usage patterns — anonymous feature usage frequency, never linked to your identity.
Analytics services never have access to your vault contents, encrypted files, intruder photos, camera feed, or any personal media. All third-party providers are contractually required to comply with applicable privacy laws including GDPR and CCPA.
Advertising
07Calculator Vault is a free app supported by ads via Google AdMob. Ads help us maintain and improve the app at no cost to you.
What AdMob may collect to serve relevant ads:
- Advertising ID — a resettable, anonymous identifier assigned by your device (not linked to your name or personal identity).
- Device information — such as device model, OS version, screen size, and language settings.
- General location — country or region level only, derived from your IP address.
- Ad interaction data — impressions and clicks, used to measure ad performance.
AdMob has absolutely no access to your vault contents, hidden files, intruder photos, or encrypted data. You can reset or opt out of personalized ads at any time via:
- Settings → Google → Ads → Reset Advertising ID or opt out of personalized ads.
AdMob's data practices are governed by Google's Privacy Policy at policies.google.com/privacy.
Data Security
08Security is the core purpose of Calculator Vault — not an afterthought. Here is our complete security posture:
- All vault files are encrypted with AES-256 GCM before being written to disk.
- Vault password is stored as a secure hash — never in readable form.
- Files are stored in the app's private sandboxed directory, invisible to other apps and file managers.
- The Decoy Vault uses a completely separate encryption key from the real vault.
- The minimal diagnostic data we transmit is sent over encrypted HTTPS connections.
- We do not operate any database or cloud infrastructure that stores your personal media.
In the event of a security concern related to our app, please contact us immediately at the email address below.
Children's Privacy
09Calculator Vault is not intended for use by children under the age of 13. We do not knowingly collect personal information from children under 13 (or the applicable age in your jurisdiction).
Since the app does not collect accounts, profiles, or personal data from any user, there is no mechanism through which children's data could be inadvertently stored on our servers — because we have no servers storing personal data.
If you are a parent or guardian and believe your child has used this app, you may contact us at the email below and we will address your concern promptly.
Your Privacy Rights
10Because Calculator Vault does not create user accounts or store personal data on external servers, most traditional data rights are satisfied by default — your data never leaves your device. You have full control:
- Access your data — all your files are always accessible to you inside the vault (with your password).
- Delete your data — delete individual files from within the vault at any time, or uninstall the app to permanently erase all vault data, intruder logs, and app settings from your device.
- Revoke permissions — revoke Camera, Storage, or Biometric permissions at any time via device settings.
- Opt out of analytics — contact us for instructions to disable analytics data collection.
- Opt out of personalized ads — reset or disable your Advertising ID via Settings → Google → Ads.
Residents of the EU (GDPR), California (CCPA), and other privacy-regulated regions may contact us to inquire about data processing practices applicable to their jurisdiction.
Changes to This Policy
11We may update this Privacy Policy as the app evolves, new features are added, or legal requirements change. When we make significant changes, we will notify you via an in-app notification and by updating the "Last Updated" date at the top of this page.
We encourage you to review this policy periodically. Your continued use of Calculator Vault after any changes constitutes your acceptance of the updated policy. If you disagree with any changes, you may stop using the app and uninstall it at any time — all your local data will be erased upon uninstallation.
Contact Us
Have a question about this Privacy Policy, a security concern, or need help with your data?
We take every message seriously and respond as quickly as possible.