What are some alternatives?
When comparing GramPhotos.com and 4K Stogram, you can also consider the following products
GramDownloadz.com - Instagram Post Downloader
GramPhotoz.com - View & Download Full Size Instagram User Pictures
PostDownloader.com - Instagram Photo & Video Downloader
Downloadagram - Official Instagram photo and video downloader.
GramDL.com - Instagram Photo & Video Downloader
Insta Dp - With InstaDp you can view instagram profile picture for free in full(original) size and download it right away.