I use an excel spreadsheet to keep track of what I use. That way I can put stats on what I use the most and the least. I also see which combo I tried and which I didn't. I can put up stats on a blade longevity versus which razor or in general. The dices don't work as some blades last 2 shaves and others 27 shaves... Depending on the blade and razor...
I really like the stats where I see when was the last time I used a razor.
I really like the stats where I see when was the last time I used a razor.