I found Copic markers a few years ago at Blick Art Store. They are pricy so I got a few of my favorite colors to use with my illustrations.
Since then, I found myself shopping for a few more every time I went there with my girls. The colors are all so beautiful, vibrant and they draw velvety.
The last time I was at the store, I could not remember if I already had one color that I had picked that day and asked the staff if I could exchange it in case I have a double. The answer made me giddy: Copis has a an app to keep track of your markers. I immediately downloaded and was impressed.
The app is very visual. You can choose the color category and the options show up as real markers:
Once you click on the marker, it is highlighted and is in your collection.
The filter options are very helpful: All, Stock or your favorites to buy next time! I might be a niche market but I find this app experience altering for me...