The best alternatives to Samsung Max are TripMode, Bandwidth+, and Bandwidth Hero. If these 3 options don't work for you, we've listed a few more alternatives below.
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TripMode is a PC and Mac app that helps you save mobile data when on the go. It stops online backups, updates, photos syncs, etc. from using data in background.
Bandwidth Hero is an open-source browser extension which saves data by compressing images on the page via data compresion service. It reduces image size by about 50%-75%.