What are some alternatives?
When comparing Gramblr and Grum, you can also consider the following products
Flume - Flume is an elegant Instagram client for the desktop.
Instazood - Instazood is the best online Instagram bot, schedule posts, and Instagram auto DM tool.
Lynkgram - A smarter way to automatically post to Instagram.
Instagram Automatic Posting by Iconosquare - Schedule now. We'll post on Instagram for you later!
Postedo - Simple Instagram scheduler that publishes for you
CrawMonkey - CrawMonkey is a powerful web-based application that automates your activity to get more followers, likes and comments on Instagram.