I treasure a long-obsolete app from Foreflight, which was once available free, called Checklist Lite. I've managed to keep it on the various iPad upgrades, but if it ever went I would find myself wrestling with over-long generic paper checklists again. I've long been puzzled by the ommision of such a universally valuable and presumably simple add-on to Sky Demon, which I'm sure the majority of pilots would use and would save me personally from having to switch apps right at the point of take off. And the Sky Demon team would implement it very elegantly, I'm sure.

http://forums.skydemon.aero/Topic10870.aspx?Keywords=checklist

OK, so following that thread I stand corrected; perhaps not everybody would use a checklist. But then there's lots of features not everyone would use. The 'every aircraft needs a different checklist' argument is self-evident but not germane, because the checklist would be constructed by the user. I've personally always used a customised checklist, weeding out all the unnecessary stuff from the official printed ones and adding personal ones, and it really shouldn't take too long build a customised checklist from scratch, or indeed multiple ones for different aircraft.

I'm not sure I would ever use it in the air - I use mnemonics for in-flight checks - so my checklist is for interior checks prior to takeoff. So it's quite short, no more than perhaps 20-25 items.

Interestingly, SD is the only major navigation app without it, as far as I can see.