The best alternatives to Otherside for Twitter are Scratch, Antipersona, and Jott. If these 3 options don't work for you, we've listed a few more alternatives below.
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Scratch is a high-level, block-based visual programming language and website aimed primarily at children as an educational tool, with a target audience of ages 8 to 16. Users on the site can create projects on the website using a block-like interface for free.