I'm myself shooting a tech camera, a Linhof Techno, using both plain focusing and tilting. So far I've been using my own custom table cards but as I'm almost always carrying a smartphone these days I've thought about using an app too. There's lots of DoF apps outh there, but I haven't really found anyone that had the feature set I'd like. If you want tilt support it's been bad, you'd need to have two apps and the tilt apps has always lacking wedge span height (the in-focus window) which I think is pretty crucial feature when deciding which f-stop to use.
So I've thought there must be a better way and I started to hack away at it a year ago (I'm an enthusiast photographer but make my living in software development), but the project was put on ice due to other more urgent things coming inbetween. Now I have however been able to finalize it and it's out on both Google Play and Apple's App Store:
App store:
https://itunes.apple.com/se/app/lumariver-depth-field-calculator/id1102190226?l=en&mt=8...and Google Play:
https://play.google.com/store/apps/details?id=com.xarepo.lumariverdof...but the home page is more fun where you can find a quick demo video, a full manual and an instruction video:
http://www.lumariver.com/#LumariverDoFI've made a lot of free software in my days (the DCamProf camera profiling project the latest), but this is not one of them, actually at $9 it's one of the more expensive apps but I don't think anyone has put as much effort into a DoF calculator before. I calculated that it would need to sell about 5000 units to actually give the same income a regular paid software development work would do. It's pretty niche and if I get a tenth of that I'm pleased. Anyway it's something I wanted to have myself so I made it, and I hope at least few others will like it :-).
The design is centered around a set of interconnected scrollers, if you move one the others follow to fit. The diagrams are animated to match the scroller settings. Then you can lock each scroller so you can set your desired depth of field in the order you like. Scrollers may seem coarse in terms of precision but the values are auto-adjusted to always make an exact fit in the center row. The GUI can be quite compact and is designed to fit on an IPhone 5 / SE screen (which makes it fit on small Android phones too, like my own Z5 Compact). On larger phones or tables the GUI expands with larger diagrams, but the information stays the same.
The tilt screen is by necessity a bit more complex. I use tilt often myself so I have carefully designed it to support the real use cases a landscape photographer meet in the field. It's not only showing angles, which frankly I never use (except when actually measuring using the smartphone tilt sensor), it also shows the wedge span at infinity as mm on the sensor (or live view, or percentage of long/short side) so you can actually measure/estimate how much span you need for a particular scene directly on the live view (or ground glass in my case).
As I'm myself in addition to wide angles using a bit longer lenses there's often a great win to set the hinge distance below ground level and the app supports that use case too. All the workflows are described in the manual, but I'll answer questions here too of course.
Naturally it's very configurable, you can specify circle of confusion sizes of course, and have them related to pixel pitch or even airy disk or both at the same time if you like. It's also possible to define two CoCs, one "sharp" and one "soft" which you can toggle on the near or far limit or both, simply to make balanced tradeoffs in siutations you can't get enough DoF.
Oh, there's a focus stacking mode there too, as focus stacking has become increasingly popular in landscape photography. The aim with the app is to be a complete depth of field toolbox for the landscape and architecture photographer.