Timely revival of this thread. I have been teaching myself Python and Swift to expand my skills. The first thing I built was an exposure calculator for guessing exposure without a meter. Then I added in some additional features for adjustments for High/low key, Bellows factor, Filters, and reciprocity. I think I have the math worked out in python but need to rework it in swift and XCode to build the actual IOS app. I am thinking of adding device database for capturing the exposure calculation and notes. And as someone pointed out it would be nice to have a place to transfer the db entries to before your phone dies.

If you have a need for an APP that does not already exist post it here. Maybe some technically inclined person will build it for you.