> For the complete documentation index, see [llms.txt](https://brlabelectronics.gitbook.io/tutorials-1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://brlabelectronics.gitbook.io/tutorials-1/creating-the-mobile-app/blynk.app.md).

# Blynk.App

Here we will set up the mobile application, giving us freedom to control the relays from our mobil device. 

If you have not already download the Blynk app for Andriod or iOS yet please do so and sign in. 

Once logged in you should see the template that you created in the earlier steps. 

Open this template and click the wrench button to open the app into developer mode. 

Developer mode is where you can add widgets and create a nice interactive mobile application for controlling devices or getting sensor data.