Does Whimsical have a desktop app?
Here's how you can install Whimsical on your device as a browser app:
Using the Chrome browser and go to whimsical.com, then:
Click the Install icon on the right side of the address bar
At the top right of Chrome, click the ... button.
Click More Tools.
Click Create Shortcut.
Using the Safari browser, go to whimsical.com and tap the More icon. Then, tap on Add to Home Screen:
Et voila! Whimsical should now appear in your dock and be searchable from Spotlight/Alfred/etc. as an app!