what do you consider the best Free and PAID apps?

[Umbrokhan]

what do you consider the best Free and PAID apps?
Mine are:-
Socratic
PhotoMath
Next Lock Screen
Gboard
SwiftKey
Samsung internet browser for high contrast, ad blocker, finger-print log in
Textra
Call Recorder - ACR
Swipe Pro for Facebook
Nova Launcher
Microsoft launcher
Weather Timeline
Pocket Casts
Tasker
FaceApp
Boost for reddit
Brilliant quotes widget
Flipboard
ES File Explorer
Flamingo for twitter
google keep
Caffeinate
Holo
SDMaid Pro (for stock Android)
Greenify (for stock Android)
KWGT
MX player Pro
Google Play books
RainWallpaper
Google Photo
Google Reward
Calendar Widget: Month
Volume Notification
Look up for chrome
PhotoScan
Smart tools
BK package disabler
Zooper widget