I have a waaay simpler version with only ePub with no pictures support: https://h5reader.azurewebsites.net/ https://h5reader.azurewebsites.net/ The advantage i

I have a waaay simpler version with only ePub with no pictures support: https://h5reader.azurewebsites.net/ https://h5reader.azurewebsites.net/ The advantage is you don't have to install anything. Whatever books you upload are simply stored in your browser (might be an issue on iOS). If you want to sync, you login into your Google Drive, and books and positions are synced via it. It is not correctly set to be a PWA, but if you're offline and the tab is still open, it will continue to work.