[Android] Free - Alpha Backup Pro (was $8.49)/NT Calculator: Extensive Calculator Pro/Sav PDF Viewer Pro - Google Play

Three more freebies for the Android users among you. The apps are highly rated and do not have IAPs or ads.

NT Calculator - Extensive Calculator Pro: https://play.google.com/store/apps/details?id=thanhletranngo…

Sav PDF Viewer Pro: https://play.google.com/store/apps/details?id=com.saverio.pd…

From the website: Alpha Backup Pro:

FEATURES

• Fully featured Application Manager.
- Manage all of your applications in one organized place.

• Advanced Backup/Restore/Share
- System & User Apps.
• Installers
• External Data [1][*]
• Complete Data [2][]
- System Settings []
- Contacts
- Call Logs
- Messages

• Advanced Auto Backup System.
- Installer
• Instantaneous [3]
• Scheduled [4]
- App Data
• Scheduled

• Backup WHEREVER YOU WANT.
- Internal Storage
- Removable SD Card
- USB Storage Devices

• Any Cloud Storage:
- Google Drive
- DropBox
- OneDrive
- And all the others (via 'Share' option)

• Share apps/backups using WHATEVER YOU WANT.
- Bluetooth
- Wi-Fi Direct
- NFC
- IR
- And any app that supports file sharing…

• Advanced Encryption System
- 256 bit custom AES encryption for best possible security.

• Portable (Single File) backups.
- Other apps generate multiple scattered backups. We don't.

• Batch operations [*]
- Supports batch operation for all kind of backups.

• Everything is in detail.
- Package name
- Version Name & Version Code
- Activities
- Services
- Broadcast Receivers
- Providers
- Permissions and their state
- Compatible OS range
- Full date & time of installation/backup
- And many more …

• Built-in Backup Importer.
- Import backups from any kind of storage devices.

• Application(s) and System generated junk cleaner.
- App(s) Cache Cleaner
- System Cache Cleaner
- Corpse Cleaner
- And more…

• Application conversion [**]
- System to User and vise versa.

• Disable/Enable (same as Freeze/Unfreeze) Apps []
• App specific private Data and Cache cleaner []
• Reset individual app settings [**]
• Built-in App lock System for better security.
• Interactive Search.
- Search apps and backups with highlighted characters - interactively - all in one place !

• Separate dedicated tabs for each kind of apps/backups.
• Huge set of controls and customization settings.
• Four beautiful material design themes.
• And tons of other unique & interesting features.
• And a lot more…

DEFINITIONS
• [1] - External Data
- External core data
- OBB
- Media components

• Internal Data
- Internal & External core data
- Settings
- Databases

• [2] - Complete Data
- (Internal Data + External Data)

• [3] - Instantaneous Auto Backup
- Auto Backup is performed right after an app gets installed / updated.

• [4] - Scheduled Auto Backup
- Auto Backup is performed periodically - at a pre-defined time.

• [*] - Single Asterisk
- Feature marked with this symbol MAY need ROOT ACCESS.
- Dependent on the Android version, availability of certain system components, and more.

• [**] - Double Asterisk
- Feature marked with this symbol WILL need ROOT ACCESS.

Enjoy!