Prism - Visual bookmarks is described as 'Bookmark your favorite sites and browse them using up-to-date screenshots, so you never lose what you love online' and is a Bookmark Manager in the Web Browsers category. There are nine alternatives to Prism - Visual bookmarks, not only websites but also apps for a variety of platforms, including Google Chrome, Firefox, Android and Android Tablet. The best alternative is Raindrop.io, which is both free and Open Source. Other great sites and apps similar to Prism - Visual bookmarks are start.me (Freemium), Saved.io (Free), Aurora New Tab & Bookmark Manager (Free) and Trove App (Free).
In your browsers address bar, type "saved.io/" in front of the URL of the site you want to save. Hit enter and you'll be redirected to saved.io where you can see the saved link. All you need is a web browser. You don't need to install any apps or extensions.