The iPhone natively records video at 30 frames per second. TimeFreeze allows you to select parts of your video and slow it down to as much as 1/20th of the original speed (similar to a camera that can shoot 600 frames per second).
TimeFreeze also allows you to add music and sound effects to the generated video. If you like the result you can with just a tap share the video to YouTube/Facebook/Twitter directly from the app.
This app normally retails for $1.99/£1.49 but today you can download it for free, just click here.
TimeFreeze does not only slow down your video, but it uses advanced motion analysis algorithms to predict movements. This data is then used to generate intermediate frames to create an ultra smooth slow motion effect like high end video editing software (Final cut pro, Adobe after effects).