They have some fairly cheap launch monitors today that are better than what any app can tell you.
Second this. I would rather spend the money on a 30 min session at the local indoor range with monitors than buy one of those apps which are about as accurate as throwing darts.
Blast Motion and Zepp are the two biggies. They are also popular for baseball and softball
I use a ES14 from Ernest Sports. A little expensive, but give you swing speed, ball speed, carry distance, total distance, launch angle, spin, and smash factor. Retail is $500, but you can probably find one on eBay for much cheaper.
I have a pixel2 and the shutter isn't fast enough to capture a clear image of the club head at impact. I highly doubt there are any apps that can accurately compute club head speed when the frames are so blurry.