	Includes REM contents	Includes spaces	Control Chars?	Case-sensitive?	Operation	Grouping(s)	Size	Program Total
Compute! Automatic Proofreader	Yes	No	CTRL+D	Yes	Input Buffer	Line	1 byte	No
Nibble Checkit	No	In strings	In Strings	Yes	Input Buffer	Line, Program	1 byte (line) 2 bytes (program)	Yes, on line numbers
Nibble Apple Checker	Yes	No	CTRL+D	Yes	Program	Program	1 byte (2 bytes length)	Yes, checksum and length calculation
MicroSPARC Key Perfect 2	Yes	Yes	All	Yes	Program	Groups of 10 lines, Program	Max 3 bytes	Yes, byte count
MicroSPARC Key Perfect 4	Yes	No	CTRL+D	Yes	Program	Groups of 10 lines, Program	Max 3 bytes	Yes, byte count
MicroSPARC Key Perfect 5	No	No	CTRL+D	No	Program	Groups of 10 lines, Program	4 bytes	Yes

Includes REM contents - most checksum algorithms includes the REM as well as the contents of the REM statement; some only include the REM itself.
Includes spaces - indicates if whitespace is important.
Control Chars? - indicates if any control characters are included in the checksum.
Case-sensitive? - is "A" and "a" handled differently?
Operation - if "Input Buffer" is specified, the checksums are displayed after a line of code has been entered; otherwise, the program must be completed and saved before running checksum.
Groupings - what, if any, groupings apply.

References