Best way to cheaply convert website to Android/Apple app?

For Android, you can simply make your website available as a PWA, then you can publish it to the Play Store[1].

For iOS, be aware that Apple will absolutely reject your app from the App Store if it's simply your website wrapped in WKWebView with no native iOS functionality added. The rule can be found in section 4.2 "Minimum Functionality" of the App Store guidelines [2][3].

Apple usually reject such apps with a message along the lines of "We noticed that your app only includes links, images, or content aggregated from the Internet with limited or no native iOS functionality. We understand that this content may be curated from the web specifically for your users, but since it does not sufficiently differ from a mobile web browsing experience, it is not appropriate for the App Store."

[1]: https://developers.google.com/codelabs/pwa-in-play#0 [2]: https://developer.apple.com/app-store/review/guidelines/#min... [3]: https://news.ycombinator.com/item?id=29043216

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