If you want a service to package web apps into native desktop apps with offline support, ToDesktop is worth a look. You can paste a web app URL into the tool, customize its look and user interface without programming, and add desktop features. The service supports offline mode, native notifications, file system access and other features, and distribution is relatively easy. Pricing is from free to $240 per month, depending on your needs.
Another contender is FlutterFlow. Although it's a web-based tool, you can use it to create desktop apps with a drag-and-drop interface. Features include Flutter widget-based UI design, Firebase integration and real-time collaboration. Offline support is also possible, so it's good for solo developers and teams. Pricing starts at $30 per month.
Last is AppAsap, which uses AI to help you build apps with no programming. You can create a CRUD API in a few minutes and get access to ordinary, clean source code. The service includes several tools, like a chat interface, database visualizer and frontend builder, so you can build web and mobile apps, too, including desktop apps with offline support. A free trial is available, and the monthly plan is $30.