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The Loop App

Welcome to the LoopDocs website where you can learn about the Loop app.

This site shows you step-by-step how to build, set up and operate the Loop app.

  • You do not need a technical or computer background to do this
  • You can choose to build the Loop app several ways:
    • Use a browser on any computer or tablet and install it on your iPhone via TestFlight
    • Use an up-to-date Mac Computer and install it directly on your iPhone

In order to become proficient with the app, you should learn the information on this site. Consider doing this over a period of time and reviewing the materials more than once.

  • You should test and perhaps adjust your settings to be successful with the Loop app (or any hybrid closed-loop system)
  • You will find links as you read to a robust volunteer support community

There is a common saying in our community:

Do It Yourself (DIY) does not mean Do It Alone!

Once you are using the app, you should regularly follow one or more support forums for important updates on the Loop app. Spending this time is important for success in building and operating the Loop app safely.

This website is updated regularly to keep pace with development of the Loop app and Apple releases.

What is the Loop App?

The Loop app is an automated insulin delivery application that you build and load on an iPhone.

After building the Loop app:

  • You enter your personal therapy settings (e.g., carbohydrate ratio, basal rates, insulin sensitivity)
  • You enter the carbs you eat
  •  Loop uses this information, your insulin on board (IOB) and glucose data, to determine how much insulin you need to bring your blood glucose within the target range you set
  • You can choose to have Loop automatically control insulin dosing (closed-loop mode) or have Loop recommend insulin that you manually accept or modify (open-loop mode)

Loop main display on phone Loop watch screen on watch

What is Loop Video

If you have never used the Loop app, click on links below for an introduction.

 Loop Video

  • This What is Loop video with associated pdf deck was created by the Loop and Learn team
  • Special thanks to Tina and Reese Hammer for the terrific video
  • Special thanks to Matthew Fouse for the generous use of his beautiful graphics

Important Disclaimer

Please consult with your health care professional regarding your diabetes management.

  • The Loop app is an open source project used by many, but it is not approved for therapy by any government organization.
  • You take full responsibility for building and running this system and do so at your own risk.

Volunteer Community

The Loop app has been, and continues to be, developed and supported by volunteers. From the code to this website, you are able to use this app because many volunteers have given their personal and family time.

Please add your time by reading this website before embarking on your Loop journey.