Apps for (very!) simple spreadsheet purposes Is there any way to do simple offline spreadsheets (rows, columns, plus, minus, multiply, divide, sum of range) like below without using monsters like Excel, Numbers, Google, Open Office, etc.?

I have to be able to use the arrow keys to navigate around like you do in a spreadsheet, type to add values and (simple!) formulas, and have the tables update instantly as necessary.

I noticed Linux has a text-based fossil called "SC" which would be perfect for my purposes, but it's not on Homebrew. Emacs packages would be OK as long as they don't require learning LISP.

CATEGORY 1   Item A   Item B   Item C
Feature A    YES      NO       YES
Has B        Blah     Blah     Sure
Value C      84       36       N/A
...

CATEGORY 2
X            1        77   
Y            2        99
Z            3        ..
SUM          6        ...
Numbers provides customisation to its UI which allows you to strip most of the features from the main window, leaving you the most basic of functionality.


The toolbar is customisable (right-click on toolbar and choose Customise Toolbar). You can use this to remove features you don't wish to use so that they do not show on the toolbar. You can also go further by hiding the toolbar completely.
The inspector on the right can be hidden from the View menu (View → Inspector → Hide Inspector). All that's left is the main window with the spreadsheet.


Hiding the toolbar and inspector gives you a window that looks like the following. UI can't really look more basic than that!