For single page apps, you will need to notify Tend of new page views. Here is how you can do that.
Note: Requires tracking script v2.4+.
Notify Tend of new pages by adding the following script...
<script>
(function() {
tend.page('page_url');
})();
</script>
The full page url (domain + path) is required. To notify Tend of a visit to your "/about" page, you would use something like...
tend.page('http://yourdomain.com/about')