AndifTouch is an app to interactively correct radial and perspective distortions in pictures. Radial distortions are typical for wide angle photography (e.g. fisheye effect and barrel distortion, in german: Fischaugen Effekt and tonnenförmige Verzeichnung). Perspective distortions (keystone effect, tilt and shift or in german: Stuerzende Linien) occur often in architectural photography.
Please try the demo version.