This company called buffer allows you to see your instagram posts next to one another in a grid format so you know if advance how your post will look next to the others.

"The new Grid view tab In Buffer lets you preview exactly how your scheduled posts will look before they go live—so you can curate that perfect aesthetic with zero guesswork.

No more posting and hoping. Now you can nail your Instagram look, right in Buffer.

It's available now on web and coming soon to our mobile apps."