This $1.99 iphone app measures level and angles and nice to have. If you get a straight piece of wood or metal to rest it on, it can is amazingly good at doing a bunch of useful measuring. Its my go to saddle set up tool as you can just lay your phone on the saddle to check, or set, an angle.
https://apps.apple.com/us/app/ihandy-carpenter/id293621500
There are 5 tools in this Carpenter toolkit:
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A plumb bob, the easiest way for you to verify the verticality of lines or walls
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A surface level, the best tool to level any flat surface
-a bubble level bar, exactly like what you see in a woodworking shop but more attractive.
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A steel protractor, measuring angles from 0 to 180 degrees.
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A steel ruler, supporting both inches and centimeters. By swiping it left and right, the ruler is capable to measure things much longer than your iPhone!
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Once calibrated, the plumb bob, surface level and level bar can also be used as an inclinometer/clinometer by reading the angles on the screen.