CodePen vs CodeSandbox: What are the differences?
What is CodeSandbox? Online playground for React. CodeSandbox allows developers to simply go to a URL in their browser to start building. This not only makes it easier to get started, it also makes it easier to share. You can just share your created work by sharing the URL, others can then (without downloading) further develop on these sandboxes.
CodePen and CodeSandbox can be primarily classified as "Cloud IDE" tools.
CodeSandbox is an open source tool with 7.76K GitHub stars and 972 GitHub forks. Here's a link to CodeSandbox's open source repository on GitHub.