I encourage you to check out my app ;)
Demo for Showcase: https://www.youtube.com/watch?v=ehGolVAHm8U
App Store link: https://apps.apple.com/gb/app/showcase-co/id6740991352?platf...
Your app looks really and the website is also cool but Readeck and Omnom are both selfhosted bookmark managers. A cool app is good to have but not a requirement.