Halide is a fantastic camera app for the iPhone, and one that I use exclusively. The team created a new app called Spectre. It gives you long exposure photography powered by machine learning.
Spectre reimagines long exposures: its intelligent shutter takes hundreds of photos during the exposure time and merges the result. That means you don’t just get a final still image, but also a video of the entire exposure as it happened.
The app is on sale with an introductory price of only US$1.99.