Alter speed

Hyperlapse: Instagram’s Hyperlapse is designed to let people easily make highquality time-lapse videos even while moving around with just a smartphone. Currently, it's just available for iPhone users.

Framelapse: This is the alternative to Hyperlapse for Android users.

Video Reverse: The app lets you pick any video from your gallery, and turn it backward using five different speed options that let you slow it down or make it play in fast-forward.