I've read a handful of things over the years with that as part of the worldbuilding (pretty certain that more or less comes up re: techno shamans in shadowrun, just as an example). Honestly, from a technomancy/magitek perspective -- just a high-tech friendly or formulaic magic system in general -- it makes an incredible amount of sense. Pretty much everything paper and ink (scrolls, spellbooks, runic systems, all those fancy spell circles, etc., etc.) can do, digital can do better. Digital assistants, casting aids, digitalized arcane repositories, etc., etc., etc.
Like, imagine what elminster could pull off with mechadendrites, y'know? It can be pretty neat.well, besides HERESY, of course
And having an app for, say, create water or food? World hunger solved, assuming magic isn't a (functionally) finite resource in that universe.
Regardless, it would be straight up in line with your average uses/day artifacts. Probably have some material components, so the only purpose of it being an app would be ease of use (likely part of a compendium style multi-effect artifact*) or part of an interface, but... yeah. It's a logical progression.
*Modern miniaturization making thin sheets of properly enchanted material, bound together... stuff like that. Industrial revolution does amazing things for the average magical system, assuming everyone involved isn't plot-lobotomized.
E: This is disregarding the fact that most aps could count as a divination or illusion spell as-is, ha. Hell, your average flashlight ap could probably match some evocation spells... (I'm looking at you, 0th level light.*).
E2: *What's really scary is that depending on the machine you could be looking at a light spell from a 18th+ level caster. Remember folks, if you put your phone in your pocket, for every 10 minutes it can display a white screen, you've got the equivalent of that many caster levels in your pants. 20th level pocket wizard, ohohoho.