Is that an alphabetic sequence or a revenue sequence ? :-)

FWIW I have to say that while I have bought the iOS versions of Graffle, Outliner, and Focus I somehow find that in practice I don't actually use them from one month to the next – too fiddly and restrictive to make good use of an available half hour … and then there is the issue of all the data effectively having to go through somebody else's servers just to get to my OS X machine. Some institutions here have concluded that the use of services like iCloud and Dropbox is inconsistent with their obligations under local data protection legislation ...

Not sure that I can imagine upgrading the iOS versions of these apps if any future releases were produced ...