Thinking about this more, the problem isn&#x27;t that list apps are an underserved market, but rather that they&#x27;re an <i>overserved</i> market. Making a list app is easy - so easy that &quot;make a list app&quot; is the glorified &quot;Hello world&quot; used to demonstrate real-world code for lots of Javascript frameworks and other language libraries.<p>Successful examples are vertical, not horizontal. The obvious ones mentioned here are Trello and Pinterest, neither of which are &quot;list apps&quot; in the standard sense. Other ones coming to mind are Buzzfeed-style click-bait, of the &quot;Here are 17 stupid things! Number 4 will shock you!&quot; variety - but those aren&#x27;t so much lists as bait technique.