Is Polaris Web Components mandatory for Shopify apps? Can I use TailwindCSS and Other Libraries in a React Router app?

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1

Hi everyone,
I’m building an embedded Shopify app using the Shopify React Router template, and the app is a Back-in-Stock / Notify-Me type tool.

I have two questions:

  1. Is it mandatory to use Shopify Polaris Web Components for my app UI, or is it acceptable to use a custom design system?

  2. Is it okay to use TailwindCSS and other UI libraries (like headless UI, floating UI, etc.) inside a Shopify React Router app?
    Will Shopify reject the app if I don’t use Polaris?

My app is working fine with Tailwind, but I want to confirm what’s officially allowed before publishing to the Shopify App Store.

2

You can use whatever UI you want, but you will need to use Polaris’ design system if you want to apply for the Built for Shopify programme.

3

Thanks so much, Luke. Your explanation was really helpful — I appreciate you taking the time to clarify this.