The best alternatives to Ultra are Enzyme, Boring Avatars, and JavaScript Quiz. If these 3 options don't work for you, we've listed a few more alternatives below.
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Sigma - See the Next Generation of Analytics— AI, Data Apps, Python - Attend the launch!
This app will help you get ready for your next JavaScript role interview. It contains over 300 questions about JavaScript, React.js, Next.js, Testing and architecture for every developer. For free :)!