- βAutomates insulin delivery using real-time CGM data for better glucose control
- βReduces overnight hypoglycemia and daily management burden significantly
- βLarge online community and detailed documentation make learning accessible
What Is the Loop App?
The Loop app is a revolutionary open-source, do-it-yourself (DIY) closed-loop insulin delivery system designed for people with diabetes. It connects a compatible continuous glucose monitor (CGM), an insulin pump, and a smartphone to automatically adjust insulin delivery in real time. Often called an "artificial pancreas" system, Loop has transformed diabetes management for thousands of users worldwide.
How Does Loop Work?
Loop works by creating a communication bridge between your CGM sensor, your compatible insulin pump, and the Loop app on your iPhone. The app reads your glucose data every five minutes, calculates the insulin needed based on your personal settings, and sends commands to your pump β all automatically. This continuous feedback loop reduces both high and low blood sugar events, giving users more time in their target glucose range.
The system relies on three core components:
- A compatible CGM β such as the Dexcom G6, G7, or Libre 3
- A compatible insulin pump β older Medtronic pumps or the Omnipod DASH/5
- An iPhone β running the Loop app built through Xcode or TestFlight
Who Can Use the Loop App?
Loop is primarily used by people with Type 1 diabetes, though some individuals with Type 2 diabetes on insulin therapy also benefit from it. Because it is a DIY system, users (or their caregivers) must be comfortable building the app, configuring settings, and troubleshooting technical issues. It is not a plug-and-play commercial product β it requires dedication, learning, and an active online support community.
Parents of children with Type 1 diabetes have been among the most passionate adopters of Loop, as it enables overnight automatic adjustments that reduce the burden of 2 a.m. blood sugar checks.
Benefits of Using Loop
Users who successfully implement Loop often report dramatic improvements in their diabetes management, including:
- Significantly more time in target glucose range
- Fewer hypoglycemic episodes, especially overnight
- Reduced mental burden of constant glucose monitoring
- Better A1C results over time
- Increased confidence and peace of mind
Risks and Considerations
Because Loop is not FDA-cleared as a complete system, users assume full responsibility for its use. Errors in pump settings, carb entry mistakes, or equipment malfunctions can lead to dangerous insulin dosing. It is critical to work closely with your endocrinologist when starting Loop and to never disable safety alerts on your CGM.
For reliable CGM sensors that pair seamlessly with the Loop system, many users turn to trusted suppliers like mdsdiabetes.com, where a wide selection of CGM supplies and accessories are available at competitive prices.
Getting Started With Loop
Starting your Loop journey involves several steps:
- Join the Loop and Learn Facebook group or visit loopdocs.org for documentation
- Confirm your pump and CGM compatibility
- Build or obtain the Loop app through TestFlight
- Work with your diabetes care team to dial in your settings
- Start in "open loop" mode before switching to closed loop
The Future of DIY Closed Loop
The DIY diabetes community continues to innovate rapidly. Projects like iAPS and Trio are building on Loop's foundation to add even more advanced algorithms, including those inspired by commercial systems. As CGM technology improves and more pump options become compatible, DIY closed-loop systems like Loop will only become more accessible and effective.
Whether you are newly diagnosed or a long-time diabetes veteran, the Loop app represents one of the most empowering tools available in modern diabetes management today.