Question: app to do photo collage?
Answer: Pic Collage. Compatibility: Android, iOS | Price: Free; $4.99/month ($35/year) for premium features. ... 
Diptic. Compatibility: iOS | Price: $2.99; in-app purchases. ... 
Moldiv. Compatibility: Android, iOS | Price: Free; $14.99 for all features. ... 
PicPlayPost. ... 
PicsArt. ... 
PiZap. ... 
Pic Stitch. ... 
PhotoGrid.