I did not see this before I worked on this. They are very similar in features, mine supports glulx, and I have a notes feature as well. I intend on keeping Lampwick free. cairn seems to be more polished than mine is currently…
I basically built this because Frotz relies on dropbox, and I just wanted iCloud support for myself, and while I was at it I added some features I thought would be cool. I am glad to be so similar to Cairn which looks to be well thought out and well executed.
My next effort will be for an inform7 editor and compiler for the iPad. But I don’t want to duplicate effort from the official Inform7 project if they have one in the works..