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Welcome to News from Loop and Learn

Master Your DIY Closed-Loop Insulin Delivery System

Published on 01 August 2025.

In this edition:

Upcoming Video Conference Sessions

Loop and Learn: Informal Discussion (Open Mic) virtual meetings are scheduled on the second Thursday of each month and the fourth Saturday of each month.

There is also an Italian Open Mic on the last Tuesday for iOS and Android loopers (with Patrick Sonnerat for AAPS).

Calendar

Video Conference Sessions use the following links every month. Either the Zoom link for the English sessions or the Google Meet Link for the Italian sessions.

Topic Recorded? Time Date
Loop and Learn: Informal Discussion
Open Mic on 2nd Thursday		 no 18:00 UTC 14 August 2025
Loop and Learn: Informal Discussion
Open Mic on 4th Saturday		 no 21:00 UTC 23 August 2025
Loop and Learn Italia: Informal Discussion
Open Mic on last Tuesday
Google Meet Link		 no 18:00 UTC 30 August 2025

Time Zone Converter

Need help figuring out when an event happens in your time zone? Try the SavvyTime: UTC Converter.

Please Update to iOS 18.6

Apple has released several updates, including iOS 18.6, which includes 29 security fixes. These updates are reported to be the final updates before iOS 26 is released in September/October. As expected, no compatibility issues have been identified. We have used Xcode 16.4 to successfully build these apps to an iOS 18.6 phone:

  • Trio main and dev branches
  • Loop main (3.6.4) and dev branch
  • LoopCaregiver
  • LoopFollow
  • xDrip4iOS

Remember to turn off iOS Automatic Updates on your looping phone in iPhone Settings/General/Software Update. You should update as soon as you get the all-clear, but do it while you are awake and able to observe if there is any problem getting your insulin delivery device working again after the iOS update.

Browser Build:

Here are two important things for Browser Builders to pay attention to (or ignore).

Automatic Update & Build

Reminder:

  • Browser Builds automatically rebuild on the first of every month
  • Browser Builds also automatically rebuild on Wednesdays if the developer has updated the repository since the previous build

A number of users have reported their builds fail during the automatic update process due to a GitHub resource issues. To improve the rate of successful builds, the developers have slightly modified the timing of the automatic updates. This is true for all the Open-Source AID and support apps.

There is a table in LoopDocs which shows the time at which each automatic build is planned in the future. This time shift will happen on your second build after this modification is made to the app in question. The first build uses the existing build time and the new build time won't be in place unti the fork is updated as part of the build process.

Please: take this opportunity to look at TestFlight:

  • If your most recent build expires in 60 days or more, there is no need for manual action

  • If your most recent build expires in less than 60 days, you should sync your fork and build your app

If you would like someone to look at your build logs, please provide your GitHub username, the app(s) you want to build and we'll take a look at your build logs.

Important: Because of the automatic build failure, it is possible GitHub will disable your build action. If that happens to you, you must manually enable it again to get automatic builds to resume.

Apple Age Rating Questionaire

Many of our members have asked how/whether to respond to the Apple Age Rating Questionaire email. For now, we believe that DIY loopers do not need to take any action.

We use App Store Connect, but do not distribute via the App Store (which is what this requirement is about).

Most of us distribute via an Internal Testing Group to ourselves, our spouse, and/or our child(ren). We are not the target audience of this questionnaire.

Loop v3.6.4 is released

Loop v3.6.4 was released on 31 July 2025.

This release:

  • provides support for newer European Libre 2 plus sensors (mid 2025 Libre 2 plus EU sensors)
  • adds localization to the LibreTransmitter module
  • adjusts build dependencies for G7SensorKit (no functional change)
  • shifts the automatic build time from hh:00 to hh:33
    • automatic builds have been running into errors recently
    • this time shift avoids a time when GitHub resources are impacted

xDrip4iOS: Community Update

As many of you already know, the public TestFlight builds of xDrip4iOS (xDrip4iO5 / xDrip4i5_MD) will stop working soon (or have already). Apple rejected the latest update (version 5.8.0), and those builds can no longer be updated or extended.

These public TestFlight builds were joined via shared links and each supported up to 10,000 users. If you’re using one of them, you’ll need to switch to another option to continue using xDrip4iOS.

What Are the Current Options?

  • Build xDrip4iOS yourself

This is the preferred and most stable option — especially if you are already building Loop, Trio, or LoopFollow.

You can use your own Apple Developer account:

  • Private TestFlight builds

If you’re using a private TestFlight invite (limited to 100 users), your version is unaffected. Slots may be available via trusted community releasers. Check xDrip4iOS FaceBook group for free slots if needed.

  • Zukka (App Store release)

Zukka is based on the xDrip4iOS code and is now aligned with the core developers. Core features will remain free, and any changes will be communicated in advance.

Please keep in mind that both Zukka and private TestFlight options depend on individuals or external platforms, and may change or become unavailable. For long-term continuity and control, building the app yourself is the most future-proof solution. The project continues actively, and we’re grateful to all the developers and contributors who keep it evolving.

A Look at LoopDocs

Do you have trouble understanding LoopDocs? Perhaps you’re reading it in the wrong language. LoopDocs is readable in many different languages. Take a look!

Loop and Learn at Friends for Life

work in progress

Pregnancy and T1D Research Opportunity

Are you pregnant and living with T1D? You may be eligible to participate in an important study to help better understand T1D during pregnancy and improve outcomes. This is a remote study conducted by Mount Sinai.

Advocacy in Action: FOLLOW T1D gets a Big Win

The US Department of Justice protects T1D rights again! The US Attorney's office for the Western District of Washington State reached a settlement with a public school district that once again confirms remotely monitoring students’ CGMs is a reasonable accommodation that schools must provide to comply with the Americans with Disabilities Act. If it's true for one state it's true for all states under federal law!

If your local schools still refuse to remotely monitor CGMs of their students, provide them with the letter on this page to compel them to FOLLOWT1Ds and FOLLOW Federal Laws. If they still refuse, contact FOLLOWT1Ds!