I have used Numi for several years - and versus Alfred/Google variants i have found Numi to be incredibly helpful for most back of the hand calculations.
I have yet to find an alternative that is more convenient
1) Configurable keyboard shortcut to bring this up
2) Good units/percentages/bytes support
3) Variable assignments / custom functions
4) Long History
I have yet to find an alternative that is more convenient
1) Configurable keyboard shortcut to bring this up 2) Good units/percentages/bytes support 3) Variable assignments / custom functions 4) Long History