&lt;p&gt;In our family, it is hard to track whether the dog gets his three meals a day. So I wrote a simple app that works like this:&lt;/p&gt;
&lt;ol&gt;
&lt;li&gt;The dog food bin has an NFC tag&lt;/li&gt;
&lt;li&gt;Our iPhones have a shortcut that, when the NFC tag is tapped, checks how many times the dog has been fed&lt;/li&gt;
&lt;li&gt;A Spin TypeScript app uses Key Value Store to track and store how many times the NFC token has been tapped&lt;/li&gt;
&lt;li&gt;If the dog has been fed already, the iPhone shortcut lets the user know. Otherwise it logs a feeding.&lt;/li&gt;
&lt;/ol&gt;
&lt;p&gt;The Spin app has both a web UI and a simple JSON REST API. The iPhone shortcut uses the REST API.&lt;/p&gt;