I was just starting to put together an excel file when my computer in my shop died.  That was maybe 4 years ago.  Since then my daughter was born and I changed jobs so it got pushed WAY to the back of the priority list! 

 

I do maintain a fairly detailed written logbook for all of my reels that includes purchase date, line, cleaning schedule, and repairs and upgrades.  With twenty something reels in the rotation at any one time, I can't rely on my memory!  

Oh god help me....no way....i have used excel so much over the years that i don't ever want to see a spreadsheet again! lol.....but i do put my rods, reels and line in my phone app. There are a few good ones out there.