To-do Lists 1.x : No syncing anymore

Unfortunately Dropbox shut down v1 of their API :
Since To-do Lists 1.x app was developed years ago and aimed to support old OS versions most likely we will not spend time on updating it.
Instead we’ll continue work on To-do Lists 2.0, which will include Dropbox/iCloud syncing support as well.
Sorry for inconvenience.

September 29, 2017