update readme

Author: NullPointerException

README.md

@@ -85,6 +85,14 @@ Liberapay: https://liberapay.com/PipePipe
 
 Ko-fi: https://ko-fi.com/pipepipe
 
+## YouTube alternatives on other platforms
+
+- [TypeType](https://github.com/Priveetee/TypeType) (Web, self-hosted)
+- [Rinox](https://apps.apple.com/us/app/rinox-peertube-client/id6758531467) (iOS, freemium — add `ptube.app` in Settings > Locations)
+
+*These projects are not affiliated with this project.*
+
+
 ## Community
 
 [PipePipe Wiki](https://priveetee.github.io/Docs-PipePipe) User wiki maintained by [@Priveetee](https://github.com/Priveetee)