React Native Desktop VS User CSS

Build OS X desktop apps using React Native

User CSS is a browser extension that allows you to inspect style sheets from websites.

Cross-Platform Code Sharing
React Native Desktop allows for code sharing between mobile and desktop platforms, reducing development time and effort. This promotes a unified codebase across iOS, Android, and macOS platforms.
React Ecosystem
Developers can leverage the extensive ecosystem of React and React Native, including libraries, tools, and community support, thus simplifying development and benefiting from existing solutions.
Hot Reloading
React Native Desktop supports hot reloading, which allows developers to see changes immediately without rebuilding the whole application. This greatly enhances development speed and productivity.
Native Performance
React Native Desktop aims to deliver a performance close to native applications on macOS, allowing for smooth user experience and efficient utilization of the system's resources.

Immature Project
React Native Desktop is still a relatively young project compared to its mobile counterpart. It may lack some stability, advanced features, and support that are available in more mature frameworks.
Learning Curve
Developers familiar with only web development might find it challenging to adapt to React Native's paradigms and native coding patterns required for desktop applications.
Limited macOS-Specific Components
There might be fewer out-of-the-box components and libraries tailored for macOS when compared to those available for mobile, requiring more custom implementation work.
No Official Support
As an open-source project, React Native Desktop doesn't have official support from Facebook or a large organization, which might lead to slower updates and a greater reliance on community contributions.

Customization
User CSS allows for extensive customization of the appearance of websites, enabling users to tailor styles to their preferences or needs.
Accessibility
Custom styles can improve accessibility by enhancing contrast, increasing font sizes, or adjusting layouts to make content more readable for individuals with visual impairments.
Consistency
It can create a consistent look and feel across different websites by applying a personalized style sheet, which is beneficial for users who value uniformity.
Ad Blocking
User CSS can be used to hide unwanted elements like advertisements or pop-ups, creating a cleaner browsing experience.
Focus on Content
Users can modify the display to focus on content they deem important by hiding or de-emphasizing less relevant elements.

Maintenance
User CSS scripts need regular updates and maintenance, as changes to website structures, class names, or IDs can break the applied styles.
Compatibility Issues
Custom styles may not render correctly across different devices or browsers, leading to inconsistencies in how content is viewed.
Complexity
For non-technical users, creating and managing User CSS can be complex and daunting without knowledge of CSS.
Website Functionality
Incorrect or overly aggressive styling can inadvertently break website functionality or usability by hiding functional elements such as navigation or interactive components.
Performance
Applying User CSS can affect the loading performance of websites, especially if the styles are extensive or poorly optimized.