शून्य · Shunya

From the long-press menu you can lock an app (PIN or fingerprint to open it) or hide it (gone from the list, search and notifications; still reachable from Hidden Apps).

• The first time, you create a PIN. It is stored only as a salted hash and never leaves the phone.
• Fingerprint or face unlock is optional and handled entirely by Android.
• Locked app notifications can be opened only after you unlock.

Android also opens apps from Settings, the Play Store and the Recents screen. To protect locked apps there too, Shunya offers App Lock Guard. It is off until you enable it in Android Settings → Accessibility.

Open Phone from Home. Tabs for the dialpad, recent calls and contacts.

• Dialpad with T9 contact search: type letters on the number keys to find a contact.
• Recents shows calls, missed calls and unknown numbers. Tap a number to call or save it.
• Contacts with favourites, merging of duplicates and links to a contact's apps.
• On an incoming call a full-screen caller screen appears with the caller's name and, if you use Shield, any known spam warning.
• To make Shunya your calling app, choose it in Android Settings → Default apps → Phone. You can switch back at any time.

Open Messages from Home. It reads your SMS and sorts them into General, OTP and Promotions on the device.

• Reading works after you allow SMS. To send and receive in Shunya, tap "Set as default" and confirm Android's prompt.
• Codes are detected carefully (account numbers, amounts and dates are not mistaken for an OTP).
• You can move a sender to another category; Shunya remembers it.
• Nothing is sent without you tapping Send. Picture messages (MMS) are not supported yet.

Shield helps you recognise unwanted calls and messages.

• On your phone: block numbers, mark spam, and see offline hints about a number.
• Community (optional): look up a number or report it. Only a keyed hash of the number is sent, never your contacts, and you can delete your community data from the Shield screen.
• Shield only helps you decide; it does not block calls you did not choose to block.

Swipe down on Home (or tap the notification dot) for the Control Center, with all your notifications below.

• Tiles: Wi-Fi and Bluetooth (show state and open Android's panel), flashlight, Do Not Disturb, sound mode, brightness.
• Notifications: read, open and dismiss them in one list. Notifications of hidden apps are filtered out. Previews can be turned off in Settings → Notifications.
• To collect notifications, allow Notification access for Shunya in Android Settings. Everything stays on the phone.
• Brightness needs "Modify system settings" and Do Not Disturb needs "Do Not Disturb access"; Shunya asks only when you tap the tile.

Modes (like Work, Sleep and Driving) change Do Not Disturb, ringer and brightness. Routines turn a mode on by themselves: by time, a place, Wi-Fi, Bluetooth or charging.

• Pick a template or build your own. A place is set by choosing it on a map or using your current spot.
• Switch a mode by hand from the Control Center row; this always wins over routines.
• If Shunya cannot be sure a condition is true (no location fix, no permission) it does nothing rather than guess.
• Shunya puts back your settings only if you have not changed them yourself. A history shows what ran and what failed.
• Rules, places and history are stored encrypted on the phone.

Optional Shunya widgets can sit on Home: digital clock, date, analogue clock and weather. Open the app list's ⋮ menu → Widgets, then drag a widget onto Home; it snaps to Home's text margin. Weather is opt-in: it asks for your city or location only when you add it.

• Text follows Android's font size; layouts reflow instead of clipping.
• Controls are labelled for TalkBack. Gestures also have buttons: for example, an "Open apps" action on the Home clock.
• High contrast: AMOLED black or matte white.
• Gestures have tap alternatives, such as the notification dot and the "Open apps" action.