The best alternatives to Blackbox are Give Back Box, Shyp, and wynd. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
MARQ dramatically reduces return claims and improves customer satisfaction. Using MARQ, online retailers can effortlessly record packing process and send timestamped videos to their customers.
Cards of Personality is a responsive online multiplayer web game that mimics the live social experience of playing Cards Against Humanity on a tabletop with friends. Additionally, the game allows users to make personalized decks and cards to play with.