SKRWT

Specifically designed to just offer perspective correction, SKRWT has since had more manual controls added with 4PNTS and mirroring effects added with MRRW.

Features (from Google Play)

  • All-purpose perspective and lens correction.
    Correct horizontal and vertical lines as well lens distortions for shots taken with adapters, DLSR or GoPro
    Full auto-cropping

  • 4PNTS: manually work one or more corner points of your image (in-app purchase)

  • MRRW: four high precision mirror effects (in-app purchase)

It's great to see such a well designed app with a dedicated purpose. SKRWT is easy to use but offers just about all of the perspective functionality you might need, whether it's architectural corrections or for more creative purposes.

Best used for:

  • Perspective correction
  • Creative mirror and perspective effects