(Everpix founder here) Not exactly the same, but you can manually organize your photos "at the source" (e.g. folders, iPhoto events...) and Everpix mirrors the organization in the Sources view [1]. This is actually quite powerful as you can keep using the same organization tools you are already used to, while still reaping the benefits of Everpix.

[1] https://support.everpix.com/entries/22001287-Understanding-E...