The best alternatives to Magnus UI are Avocode, EpicPxls, and refine. 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
Save time on preparing design assets and specs and let Avocode do it for you. Just import any design file and invite developers to take everything they need for a Web, iOS, Android, or React Native app.
refine is a React-based framework for building data-intensive applications. It offers lots of out-of-the box functionality for rapid development, without compromising extreme customizability. It ships with Ant Design System, an enterprise-level UI toolkit.