two brothers

Transfer files between iOS device and computer or between any two iOS devices.

Flip two cards to see if they match.

Flip two cards to see if they match.

Flip two cards to see if they match.

PDF accurate measurement of the distance and angle between two points on a page

Merge two or more PDF pages into one page in a single PDF file.

Merge two or more PDF pages into one page in a single PDF file.

Analyze changes between two HTML files with a visual Web page comparison utility.

Hold the key continuously and delay a fixed time between two key press events.

Compare the similarity and difference between the two images.