Version: 4.1-release
                                Req: 4.0 and up
                                Latest update: 30.04.2018
                                                                                                
                                                                
                             
                            
                                AHSK 4.1-release:. - New! Google Now on Tap action. - 'Google Now on Tap' trigger with long press Home. . AHSK 4.0-release:. - Android Marshmallow support (requires SuperSU v2.52). - New! Full Screen mode (hide status bar). - New! Full Screen action for QuickBar. - New Google icon
                            
                            
                                
The description of
                                    GMD Auto Hide Soft Keys ★ root 
                                AHSK allows to hide navigation bar and auto show/hide it with simple swipe from bottom. It hides only navigation bar (soft keys) in Phone UI and does not hide notification bar.Requires ROOT!KitKat support added!Known issues:- On Android 4.4 (KitKat) Hiding/showing stock navigation bar will trigger l...
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                                AHSK allows to hide navigation bar and auto show/hide it with simple swipe from bottom. It hides only navigation bar (soft keys) in Phone UI and does not hide notification bar.
Requires ROOT!
KitKat support added!
Known issues:
- On Android 4.4 (KitKat) Hiding/showing stock navigation bar will trigger lock screen. 
Unique features:
- Hide just navigation bar and keep notifications bar. 
- Show Quick NavBar and click soft button with one simple swipe.
- Spoof Soft Keys - make Android think you still have soft keys and display Menu button in applications actions bar.
- Theme Quick NavBar - use any custom image for buttons.
- Adjust trigger size and position.
- Integrate with Gesture Control or Tasker using Shortcuts.
- Stock firmwares, CyanogenMod, Pac Rom and Paranoid Android supported.
- No modifications and no reboot required.
PRO features:
- Change trigger color and/or transparency.
- Disable trigger (and Quick NavBar) if you use other alternative.
JOIN Beta version community - https://plus.google.com/communities/115800359125266491041
AndroidPolice.com review: http://www.androidpolice.com/2013/06/04/new-app-gmd-hide-soft-keys-banishes-the-navigation-bar-for-root-users-nexus-only-for-now
Other full screen apps hide notifications bar too and has no option to hide just navigation bar. Hide Soft Keys is different - it only removes navigation bar and replaces it with Quick NavBar. You can always access stock notifications list and recent applications list.