Building a mobile app landing page with Twilio SMS and Parse can help drive more app downloads by reducing friction in the download process. The solution involves creating a pure HTML mobile app landing page that submits a user's mobile number to a back end powered by Parse, which sends a link to an app download page via SMS. The page redirects to the proper app download page based on the device's platform, and the source code is available on GitHub. To customize this app landing page for your own use, you need to configure it with your own Parse and Twilio account credentials, deploy the cloud code to Parse's servers, and upload the client code to a web server. With these steps, you can create a useful app landing page that reduces barriers between users landing on your page and enjoying your mobile application.