Indeed it does... but mine allows much faster prototyping.
FridgeGrid is already pretty good. It is as multi-purpose as MSExcel, but you have to look up all the cycle counts for all the instructions, since it doesn't do it itself. This quickly becomes tedious...
I build this tool to be able to quickly draw out my kernel, and to not have to keep an 6502 instruction sheet and a playfield timing sheet to my side. You can actually touch the opcodes; actually you are the assembler, since you effectively drag and drop machine code!
So my tool is closer to a conventional assembler. However, it is at the moment only tuned for the VCS, and I do believe that modifying it for other machines might be a bit of an hassle...