Correcting wide angle photos from iPhone 6 on iOS I'm looking to correct lens distortion from my iPhone 6 when I take certain wide angle photos.

Take this picture of Pittsburgh taken on the Monongahela river just upstream of the point:



If I try to rotate it in Photos - the left side needs -5° rotation for vertical elements to look vertical. The center of attention is vertical at 0 degrees rotation. The far right side needs +8° adjustment.

I'm looking for a way to use a high quality filter to adjust for the physical characteristics of the iPhone 6 lens as described in step three of this tutorial:


Where Lightroom on the PC/Mac has a database of common lenses and the corrections needed for perspective problems


I would like to:


Avoid carrying a computer (or waiting to return to one) to edit photos like this.
Avoid getting Lightroom if there is a more narrow lens distortion program that fits this need. (A small database of common lens perspective correction factors)
Do the editing on iOS alone.


What software options exist for this task?
You may wish to try SKRWT for iOS.

From an article from PhotoApps.Expert:


  If you've ever shot a photo of a tall building from the ground, you know when 
  you tilt up at it, the perspective goes wonky and your beautiful
  square building starts to look like the pyramids of Egypt.
  
  SKRWT by mjagielski [$1.99 on the App Store] is an app that makes
  correcting that perspective distortion extremely simple. Not only does
  it do keystone correction, but it can also fix wide angle lens
  distortion.


I tested it with a snapshot of Minneapolis. (I didn't spend a lot of time on this.  Just to test.)