Blazor vs Retool: What are the differences?
Blazor: An experimental web UI framework using C#/Razor and HTML, running in the browser via WebAssembly. Blazor is a .NET web framework that runs in any browser. You author Blazor apps using C#/Razor and HTML; Retool: Build custom internal tools in minutes. Custom internal tools have the same building blocks. Retool gives you those building blocks, so you can build them much faster.
Blazor and Retool can be primarily classified as "Web App Builders" tools.
Blazor is an open source tool with 8.18K GitHub stars and 664 GitHub forks. Here's a link to Blazor's open source repository on GitHub.