Waited for such an app for sooo long!
A very practical alternative to the “real” spot meter, which has a miniscule fraction of weight, size and price. You can meter highlights and shadows to determine needed exposure in your head the oldschool way, but you can also meter any spot and place it to any zone (of Adams’s Zone System fame) and see how it affects exposure if you’re not experienced with such calculations. Simple and straightforward, no stupid vintage-inspired design, like scratched wiewfinder emulation or weird “analogue” controls, only the real deal. To the best of my knowledge it’s the only app that can measure two-degree spot, and the only problem I have with it, is that It should have existed a long time ago :)