The best alternatives to Open Design SDK are Supabase, Craftwork Design, and Avocode. If these 3 options don't work for you, we've listed a few more alternatives below.
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Supabase is an open-source backend-as-a-service that provides real-time databases, authentication, and API services. It enables developers to build and scale applications quickly without managing server infrastructure.
High-quality UX/UI and Wireframe Kits, Illustrations, Templates, and Mockups to make your design workflow faster and easier. Craftwork is a small team of designers and developers. We create our own design stuff and follow new cool products around the internet.
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.
Atomize React is a UI framework that helps developers collaborate with designers and build consistent user interfaces effortlessly. It is based on Atomize design system for Sketch. Website: https://atomizecode.com/
Diez is a free & open-source developer toolkit for expressing visual styles that can be shared across codebases, native platforms, and teams. Diez radically lowers the cost of delivering a consistent visual identity across native apps & websites.
Hyperion is an in-app design review tool to inspect measurements, attributes, and animations. Hyperion is open source and sits on top of plugins, allowing you to add your own plugins and customize your toolset. Hyperion for iOS is live on GitHub, Android forthcoming.
Codepng allows you to create awesome snapshots from your source code that you can share on social media. Choose between beautiful hand-selected background gradients and editor themes before exporting your code to PNG images.