The best alternatives to InstantGrid are Instagram, Panols, and Series. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of InstantGrid?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Cornergram is an app that allows you to edit images so that Instagram shows icons (e.g. a circle, a heart) in the profile view between the individual photos. In this way you can creatively use the otherwise useless space between the images. For this to work, you must of course apply the same symbol to several images and then upload them.
Puzzle grid post maker is android app which provides you limitless possibility to create attractive collage templates for your Instagram. It is always good to make profile more attractive and appealing to attract more followers on Instagram.