The best alternatives to Nexvio Inc. are Camera M 4.0, Afilm, and Filmtypes. If these 3 options don't work for you, we've listed a few more alternatives below.
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Camera M is a professional camera app with powerful manual controls similar to a DSLR camera, designed to achieve the highest image quality from iPhone and iPad cameras. Specializing in RAW and Depth photography, it is the best camera app your iPhone or iPad.
Filmtypes is a website that helps photographers to educate themselves about the variety of analog film stocks by showing characteristics, photo examples, written & video reviews as well as providing a way to engage in discussions.
Kada Cam is a customizable vintage camera. Kada Cam includes [Films] [Frames] [Effects]. You can freely match the combination of the three to customize your own vintage camera.