Looks cool, wish there was a Swift course. Maybe I'll make some cards as I go.

Here's a bug: Your search uses regular expressions without validating them.

1. Go to "https://www.soyoulearn.com/app/#/cards/search/"

2. Type: c++

3. The autocomplete errors and page goes blank

4. Inspector Console: "SyntaxError: Invalid regular expression: /c++/: Nothing to repeat"