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What is the Nightscout project?

Nightscout (CGM in the Cloud) is an open source, DIY project that allows real time access to a CGM data via personal website, smartwatch viewers, or apps and widgets available for smartphones.

Nightscout was developed by parents of children with Type 1 Diabetes and has continued to be developed, maintained, and supported by volunteers. When first implemented, Nightscout was a solution specifically for remote monitoring of Dexcom G4 CGM data. Today, there are Nightscout solutions available for Dexcom G4, Dexcom Share with Android, Dexcom Share with iOS, and Medtronic. The goal of the project is to allow remote monitoring of a T1D’s glucose level using existing monitoring devices.

How Do You Get Your CGM in the Cloud

Determining the best way for you to approach setting up Nightscout depends first and foremost on the following:

  1. What phone will the T1D carry? (All solutions require the T1D to have a phone used as the “uploader.”)
  2. What kind of CGM do you have?

The following chart offers an overview of the paths available to setting up CGM remote monitoring using Nightscout.


Get Started with Nightscout

Nightscout has expanded rapidly. To quickly access the information you need, try the Nightscout Cheat Sheet (Links) resource.

How Does It Work?—(Original Nightscout)

Rig in Action

The technology is rather simple: your Dexcom receiver continues to work as it always has by reading the glucose level of the T1D who is wearing the sensor/transmitter. The Nightscout system allows you to attach (or pair) a device to the Dexcom receiver that transmits the glucose readings to the Internet, where any web-connected device can view the numbers. It’s that simple.

This image from the Wall Street Journal article, “Citizen Hackers Tinker with Medical Devices,” illustrates the entire system. (Click the image for a larger view.)

Image Courtesy of Wall Street Journal, Published on line, Friday, Sept. 26, 2014

Image Courtesy of Wall Street Journal. Published on line, Friday, Sept. 26, 2014

What Does It Look Like?

Whether cabled or wireless, CGM in the Cloud solutions involve a phone paired with a CGM. In the original Nightscout setup, the cabled uploader phone and CGM was referred to as the “rig.” This is the system that the T1D keep with them, in range of the CGM transmitter, to enable the upload of real-time blood glucose data.

The combination of the smartphone + Dexcom receiver allows data to be sent to the Internet. CGM levels can then be seen from anywhere in the world. There is no limit to the number of viewers.

During the install process several systems need to be synchronized using configuration menus in several different applications. These systems are required for the system to work. Once those systems are installed and synchronized, your personal website ultimately displays the data from the cloud using an Internet browser. Almost any device that can access the Internet will be able to see this website. The website works on many mobile devices such as tablets, laptops, Mac devices, and on any other web-connected device. Depending on how you set up Nightscout, viewers are also available for Pebble watch, AndroidWear watches, and Apple Watch.


 What’s It Like In Action?

Nightscout—CGM in the Cloud from Madeline Cobbler on Vimeo.


What Do I Do Now?

The sole purpose of your specific website is to display the data. Due to the caveats mentioned and for many other reasons, it is important to not rely on this for therapy .

Reading through the step by step instructions for your particular setup before you start will help prepare you for putting everything together and learning how to use the system.

Please note: Many of the resources and documents on this site describe the original Nightscout setup (which involves a cable and an Android). There are wireless solutions now available. Documentation is being added and revised on an ongoing basis.

All we ask is that you pay it forward because #wearenotwaiting.


Join the CGM in the Cloud Community at Facebook!

Are you looking for technical support for your existing Nightscout installation or do you have questions about your existing Nightscout installation?  Please visit the CGM in the Cloud group on Facebook for help! 

Note: There is no support or any warranty of any kind. The quality and performance of the project is with you if you choose to use it. This is a project that was created and is supported completely by volunteers.


All information, thought, and code described here is intended for informational and educational purposes only. Use of code from github.com is without warranty or support of any kind.
Each element of the system can fail at any time rendering the system unusable. There is no password protected privacy or security provided by these tools; all data you upload can be available for anyone on the Internet to read if they have your specific URL to view your data. Please review the LICENSE found within each repository for further details. This is not a project of the Dexcom company. Nightscout has no affiliation with Dexcom or any other company, service or product mentioned anywhere on this website.
Do not use any of the Nightscout information or code to make medical decisions.