What are some alternatives?
When comparing DownloadIG.com and GramDownloadz.com, you can also consider the following products
GramPhotos.com - View Instagram Full Size Profile Pictures
GramDL.com - Instagram Photo & Video Downloader
PostDownloader.com - Instagram Photo & Video Downloader
4K Stogram - Free Instagram Downloader for macOS, PC and Linux. Search, download or backup Instagram photos shared by any user. Follow your favorite photographers and stay tuned!
Insta Dp - With InstaDp you can view instagram profile picture for free in full(original) size and download it right away.
GramSaving.com - Download & Save Instagram Posts