1. Hosting and infrastructure: One key difference between Bubble and Retool is the hosting and infrastructure options they provide. Bubble is a fully hosted platform where users can build and deploy their applications on Bubble's servers. On the other hand, Retool is a self-hosted platform that allows users to deploy their applications on their own infrastructure, giving them more control over the hosting environment.
2. Visual programming: Both Bubble and Retool offer a visual programming interface, but they differ in their approach. Bubble uses a visual drag-and-drop interface that allows users to build applications by simply dragging and dropping components onto the canvas and defining their properties. Retool, on the other hand, uses a visual interface that allows users to build applications by writing code in JavaScript and SQL, giving them more flexibility and control.
3. Database integration: Bubble and Retool offer different options for integrating with databases. Bubble provides native support for connecting to popular databases like MySQL, PostgreSQL, and MongoDB, making it easier for users to work with their data. Retool, on the other hand, allows users to write SQL queries directly within their applications, giving them more control over the database integration process.
4. Workflow automation: Another key difference between Bubble and Retool is the level of workflow automation they offer. Bubble provides a range of built-in automation features, such as scheduled workflows, auto-saves, and email notifications, allowing users to automate common tasks in their applications. Retool, on the other hand, focuses more on providing a flexible development environment and doesn't offer as many built-in automation options.
5. Frontend customization: Bubble and Retool also differ in their frontend customization options. Bubble provides a wide range of pre-built UI components and styling options that users can easily customize to match their design preferences. Retool, on the other hand, allows users to fully customize the frontend by writing their own HTML, CSS, and JavaScript, giving them more control over the look and feel of their applications.
6. Community and support: Lastly, Bubble and Retool have different levels of community and support resources available. Bubble has a large and active community of users who share tutorials, templates, and provide help and support through forums and social media. Retool, on the other hand, has a smaller community but provides direct support through their website, including documentation, tutorials, and responsive customer support.

In Summary, Bubble and Retool differ in their hosting and infrastructure options, visual programming approach, database integration capabilities, workflow automation features, frontend customization options, and community and support resources.