There was another thread like this one and besides Homersimpson, there were several other people who use excell spreadsheets to record. I just use a notepad to keep track. I write in when they were fed, how much, if they fed right away, when they shed etc. Every month or so I measure them using the serpwidget snake measurer program that I got on here. I also recorded when I bought them, from whom and how much I paid.