If you need a tool for quick brainstorming or sketching out concepts with a charming, hand-drawn aesthetic, Excalidraw is your best choice. It's perfect for developers sketching architecture or quickly visualizing ideas without the pressure of polish. Being open-source and capable of offline work makes it highly accessible, especially if you want to keep your data local.
On the other hand, if you're a designer or founder looking to create and publish professional-looking websites without diving into code, Framer is the way to go. It offers strong animation features and templates that are excellent for marketing sites and portfolios. However, if your project requires building a complex web application or if you need full flexibility and control over your code and hosting, Framer may fall short. In that case, stick to Excalidraw for its simplicity or seek out a more robust development platform.