I didn't see who was asking so sorry I can't quote, but this is how I keep track of my make-up purchases...
I use Excel, I have a tab for every product. Eye shadow, Blush, Lipstick, Brushes, Palettes, Nail Polish, Misc = Foundation, concealer, eyeliners, lipliners, etc. I group them into colour groups based on the MAC website. So Colour group, name, brand, colour description given on MAC website, the finish, collection/permanent and the RRP. At the bottom I total it all up. If I have a BU, I put it in twice. I don't have it on my phone which I probably should, but I usually purchase everything online anyway so for me it isn't an issue. Hope this helps.