The best alternatives to SmartGrade are Flubaroo, Homer Player, and GradePoint. If these 3 options don't work for you, we've listed a few more alternatives below.
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Homer Player is an audiobook player for the elderly. Its simple interface is aimed at people with low vision who find regular MP3 players complex and unusable. It is an Android app but it allows you to convert the whole device into a dedicated, single purpose, easy to use audiobook player.