CalcSpace: Private Workspace

CalcSpace app

About this app

CalcSpace: Private Workspace combines a fast everyday calculator—with 8 themes and a 20-entry history tape—with a true OS-level isolated Android workspace (Managed Work Profile) unlocked exclusively by your secret mathematical formula.

Built for system-level separation of your private apps, photos, files, and browsing, CalcSpace keeps your personal launcher clean and your workspace invisible when locked.

HOW CALCSPACE WORKS

1. Everyday Calculator (8 Themes & History Tape):
- Daily Math: Addition, subtraction, multiplication, division, percentages, and decimals with live preview, one-tap copy, haptics, and key-click audio.
- 8 Built-In Themes: Retro Pocket LCD (SOLAR II), Dynamic Tonal Slate, Pure Alabaster Light, Monochrome OLED Black, Warm Sand & Espresso, Studio Graphite, Nordic Arctic Slate, and Deep Sage & Mint.
- 20-Entry Timestamped History Tape: Reuse recent calculations at a tap, or use CalcSpace purely as a standard calculator.

2. Secret Mathematical Formula Gate:
Enroll a custom 6–16 character formula (e.g., 789×12) instead of a PIN screen:
- Normal calculations evaluate and display their math result naturally.
- Entering your exact secret formula and tapping "=" unlocks your private workspace.

3. True Android Work Profile Isolation:
CalcSpace provisions an official Android Managed Work Profile alongside your personal profile:
- Dedicated Play Store: Install, update, and uninstall apps directly inside your workspace.
- Isolated Camera & Gallery: Workspace photos and videos stay inside encrypted storage and never appear in your personal Gallery.
- Isolated Browser, Files & Contacts: Browse and manage workspace files and contacts with zero crossover into personal data.
- Multi-Screen 4×5 Launcher & 12 Wallpapers: Swipeable screens with free-slot placement, long-press actions (App Info, Uninstall, Move), and 12 wallpapers with dimming, glow, patterns, and glass icon frames.
- Complete Notification Silence: Workspace notifications are suppressed at the profile level so private alerts never appear in your personal shade.
- Screenshot Protection & 24 Languages: FLAG_SECURE protection and automatic 24-language & RTL support.

4. Instant Auto-Lock & Exit Protection:
- Tap "Lock space", press Home, or turn off your screen to conceal and suspend all workspace apps—leaving zero extra icons or Work tabs on your personal launcher.
- Back-button exit protection prevents accidental locking while navigating inside apps.

5. Security Center & 10-Second AC Hold Recovery:
- Change your formula or recovery question anytime in the Security Center.
- Forgot your formula? Hold "AC" for 10 seconds to answer your security question and set a new formula without losing data.

6. On-Device Hardware-Backed Security:
- Your secret formula and recovery answer are hashed with PBKDF2-HMAC-SHA256, wrapped with an Android Keystore AES-GCM key in Device-Protected storage, and never leave your device (allowBackup="false").

PROMINENT DISCLOSURE & PERMISSIONS NOTICE
- Requirements: Android 14+ on a device supporting Managed Work Profiles (android.software.managed_users).
- Profile Owner (BIND_DEVICE_ADMIN): Uses Android Profile Owner APIs solely inside the work profile to provision the workspace, hide/reveal workspace apps on unlock/lock, silence work-profile notifications, and lock the session (force-lock only). Never wipes your personal device or resets your personal password.
- Package Management (QUERY_ALL_PACKAGES & REQUEST_DELETE_PACKAGES): Used inside the work profile to list workspace apps on the grid, verify apps are hidden when locked, and uninstall workspace apps directly.
- Network & Diagnostics (INTERNET, ACCESS_NETWORK_STATE, AD_ID): Used for anonymous crash reporting, performance diagnostics, and install attribution. Your formula, calculations, and workspace apps never leave your device.
- Easy Removal: Remove the work profile anytime in Android System Settings.