ImageSplit is a free iPhone app developed by Ryosuke Tamura that allows users to easily split images and post them on Instagram. Unlike other similar apps that only allow splitting images into 3-4 rows, ImageSplit offers the flexibility to split images into 1-7 rows. One notable feature of ImageSplit is that it does not add any watermarks to the split images.

The main functionality of ImageSplit is its ability to split images. Users can simply select an image from their iPhone's gallery and choose the desired number of rows to split it into. Additionally, ImageSplit automatically saves the caption text for the split images, making it convenient for users to add captions when posting on Instagram.

With its user-friendly interface and versatile image splitting capabilities, ImageSplit is a valuable tool for Instagram users who want to showcase their photos in a unique and creative way.