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An automated insulin delivery app template for iOS, built on LoopKit
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Loop Status Extension
WatchApp Extension

Loop for iOS

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Loop is an app template for building an automated insulin delivery system. It is a stone resting on the boulders of work done by many others.

Loop is built on top of LoopKit. LoopKit is a set of frameworks that provide data storage, retrieval, and calculation, as well as boilerplate view controllers used in Loop.

Please understand that this project:

  • Is highly experimental
  • Is not approved for therapy

Screenshot of status screen Screenshot of bolus screen Screenshot of battery change notification Screenshot of loop failure notification Screenshot of bolus failure notification

Screenshot of glucose complication on Apple Watch Screenshot of carb entry on Apple Watch Screenshot of bolus entry on Apple Watch Screenshot of the app menu on Apple Watch Screenshot of bolus failure notification on Apple Watch Screenshot of bolus failure notification on Apple Watch


Insulin Pump
MM 515/7152 MM 522/7222 MM 523/7233 MM 554/7543
CGM Dexcom G41
Dexcom G5

1. Offline access to glucose requires a Receiver with Share and the Share2 app to be running on the same device. Internet-dependent access via Share servers is also supported.
2. Pump must have a remote ID added in the Remote Options menu.
3. Early firmware (US <= 2.4A, AU/EUR <= 2.6A) is required for using Closed Loop and Bolus features.
4. It's not impossible, but comms-heavy and there's some work to be done.

Mac and Xcode

To build Loop you will need a Mac, and have Xcode 8 installed on it. You can build Loop without an Apple Developer Account, but any apps built this way will expire after a week, so signing up for the $99 developer account is recommended.

iOS Phone

Loop will run on on any iPhone that is compatible with iOS 10.


Bluetooth LE communication with Minimed pumps is enabled by the RileyLink, a compact BLE-to-916MHz bridge device designed by @ps2. Please visit the repository and the gitter room for more information.


Carthage is used to manage framework dependencies. It will need to be installed on your Mac to build and run the app, but most users won't have a need to explicitly rebuild any dependencies.

Getting Started

Sign up for the Loop Users announcement list to stay informed of critical issues that may arise.

Please use the Guide to Loop for building, installation, and configuration instructions.

For FAQs and other tips, refer to the Wiki

(Note: there is also a tab for the Wiki at the top of this page)

License and Code of Conduct

Please read the LICENSE and CODE_OF_CONDUCT

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