Rainbet app: there is not one
Rainbet does not publish a mobile app or an official APK. The site runs in a phone browser, and that is the whole of the mobile offering. This page exists because the search demand says otherwise.
The direct answer
There is no Rainbet app on any app store and no official APK anywhere. Everything runs in a browser, including on a phone.
What that means for anything calling itself one
Products using the Rainbet name do appear in app stores and on download sites. They are not published by Rainbet. This site does not link to any of them and does not explain how to install one — an unofficial build asking for casino credentials is the single most effective way to lose an account.
Using the site on a phone
The browser version is the full site. It can be added to a home screen from the browser menu, which produces an icon that looks like an app and is simply a bookmark to the official address — with no installed package and no permissions granted.
Check the address
Whether on a phone or a desktop, the address bar is the test. See Rainbet login for what else to check before signing in.
Frequently asked questions
Is there a Rainbet app?
No. Rainbet has no mobile app and no official APK. The site runs in a browser.
Is there a Rainbet APK download?
No official one. Files offered under that name are not published by Rainbet.
Can I use Rainbet on a phone?
Yes, through a mobile browser. You can add it to your home screen, which creates a bookmark rather than installing anything.
Browser, not app store
There is no official package to install.