Loop Updates

If you are running Loop 3.0.0 (or lower), please update to Loop 3.2.x ASAP.  If you need help, please ask on Facebook.

Loop Recent Release History

Loop 3.2.x:

  • Loop 3.2.3 released 19-September-2023 to enable Xcode 15 to build released version (no effect on app itself)
  • Loop 3.2.2 released 24-April-2023. Update supports Xcode 14.3 archiving (no effect on app itself)
  • Loop 3.2.1 released 20-March-2023. Primary update is to languages (no more Spanish-only for G7 screen).
  • Loop 3.2.0 released 17-March-2023. This version included some critical fixes and new features.

Loop 3.0.0 DO NOT USE

  • Loop 3.0.0 was the first release of Loop 3 and some critical bugs were found – please do not continue using this build

Loop with Patches is no longer supported

Customization Script Updates

Recent changes to the Customization Script are highlighted below. (Details and older changes are included in the complete list below).

  • The Profile customization sends the current Profile name to Nightscout
  • Loop Follow (v2.1.4) makes use of this new update and displays the current Profile name

To get the latest version:

  • Browser Build: Run the Action Build Loop again with your choices for Customization in the build_loop.yml file
    • If updates to the build_loop.yml file are required, the customization that needs an update is found in parentheses and quotes below, for example (“name”)
  • Mac-Xcode Build: run the Customization Select Script again to be offered the updates

For both main and dev:

  • The Profile customization was enhanced on 20 January 2024
    • Profile Save & Load (“2002”)
    • Uploads profile name to Nightscout and fixes a mmol/L rounding issue
    • Because of a Nightscout issue, profile names cannot include a “.” character
      • if you use “.” in the name it will be automatically changed to an underscore: “_”
  • The Profile customization was modified on 13-September-2023
    • Profile Save & Load (“2002”)
    • Updated to be compatible with dev, no changes to features

For main:

  • Add TestFlight Expiration Warning to the Loop app – only makes sense for Browser Build, only needed for main – already included in dev, (“testflight_expiration_warning”)
  • Limit CGM driven Loop cycle to 5 minutes updated as of 10-August-2023 (“limit_loop_cycle_time”)
  • Algorithm Experiments updated – the Integral Retrospective Correction updates (PR 2028) are included as of 25-July-2023 (“algorithm_experiments”)

For dev:

  • 23 Sept 2023: “omnipod_cage” is no longer needed – this functionality was added to Loop (thanks again Pete)
  • 22 Sept 2023: “dexcom_sage” is no longer needed – this functionality was added to Loop (thanks Pete)
    • But there is a bug for Dexcom G6 only – you must go into Nightscout Admin tools and delete future entries one time following each Sensor Change and then SAGE will report properly
    • The dev version works fine for Dexcom G7
  • Limit CGM driven Loop cycle to 5 minutes included in dev as of 9-August-2023, so the customization must be removed (“limit_loop_cycle_time”)
  • CustomTypeOne LoopPatches – modified to support recent dev changes: no longer include switcher patch or negative IOB patch (“customtypeone_looppatches”)
  • Algorithm Experiments are included in dev and show as incompatible – this is normal
    • If your build_loop.yml has (“pr1988”) or (“pr2008”) as choices-those must be removed before running the Action to Build Loop again

iOS / Apple Updates

What are the latest “tested” versions?

The Version of macOS and Xcode that you need are based on your phone’s iOS.  These Versions have been tested to operate and build Loop.  This table includes the latest tested versions of iOS, along with the compatible minimum Xcode and macOS versions.

Latest Tested Version of
iOS [Release Date] 
Minimum Xcode [Release Date]  Minimum OS 
[Release Date]
iOS 17.4.1
[21 March 2024]

Xcode 15.1
[18 December 2023]


15.3 is latest tested version

macOS Ventura 13.5

Sonoma 14.3 is latest tested version.
[22 January 2024]

iOS 16.7.7
[21 March 2024]

Xcode 14.3
[1 June 2023]



15.2 is latest tested version

macOS Ventura 13
iOS 15.8.2
[5 March 2024]

Xcode 14.0.x
[12 September 2022]



15.2 is latest tested version

macOS Monterey 12.5

Your iOS version determines your minimum Xcode version and your Xcode version determines your minimum macOS version. Xcode is backwards compatible. For example, if you’re on iOS 16.7.x, you can use either Xcode 14.3.x or Xcode 15. If your versions are not listed here, check out: https://developer.apple.com/support/xcode.

Your phone hardware determines the maximum iOS supported. Loop runs on iOS 15, iOS 16 and iOS 17. Loop developers try to support one version of iOS behind the latest. It is unusual that three iOS are supported by Loop, but it is currently true.

Note: When we refer to a version and include “x” in its name, we’re referring to any release of that version of iOS, macOS, or Xcode.  When we describe specific versions, as in the case below for the specific versions of Xcode that will build to an iOS 15.7 device, we mean those very specific versions.

If updating from iOS 16 to iOS 17

Choose when you want to update a given phone from iOS 16 to iOS 17 if you already have the Loop app on it. It might take 45 minutes for these steps to complete – don’t panic, plan ahead and be patient. In other words, don’t do the update right before you need to bolus for a meal.

  1. Automatic reboot of phone when updating
  2. Indexing process that happens (by Apple) with the transition from iOS 16 to 17
  3. Apple Health and Loop will not open until this indexing completes

Important for Loopers on Loop-2.2.x and FreeAPS (as well as iAPS) using Omnipod

A bug in Loop-2.2.x and FreeAPS (as well as iAPS) can cause your pod and CGM’s transmitter ID to revert to your prior pod and CGM transmitter ID.  If this happens to you, you can easily update your transmitter ID from within the Loop app, but sadly, you’d need to replace your pod.  This bug has been fixed in Loop 3.x.

Do I need to rebuild before I update my phone iOS?

Be prepared to rebuild whenever you update your phone iOS – especially for major updates. Whether you need to rebuild first depends upon which iOS you are upgrading from and your build method:

  • For Mac-Xcode build method, update your macOS and Xcode before you update your phone iOS
  • If your Mac can’t update to macOS 13.x or higher, use the Browser Build method

Mac-Xcode Builders Only

Loop 3.2.3 was released on 19 September 2023 to allow you to build with Xcode 15 (required by iOS 17).

Should I update to iOS17.0 or higher?

Best practice is to wait a bit before accepting a major iOS upgrade on your looping phone.

Your Mac must be capable of running macOS 13.5 Ventura or greater.

How to build Loop to an iOS 17.0 or higher phone

  1. Update your macOS to Ventura 13.5 or greater
  2. Download Xcode 15.0 or greater
  3. Use the Build Select Script to download fresh Loop code and rebuild

Developer Mode

This has gotten more complicated recently. Please refer to the LoopDocs write-up on Developer Mode.

iOS 15.8

If you have an iPhone 6s, 7, or 1st generation SE, iOS 15.8 is all that shows up as available.  Apple has announced they will not support those phones with iOS 16.  But you can still build Loop with iOS 15.8 and those phones.

What about older versions of iOS?

To see what version of macOS and Xcode will work with your older iOS, check out LoopDocs.

Turn off auto-update

Do not set your Loop phone to auto-update the iOS version when using Mac-Xcode build. 

In iPhone Settings, go to General / Software Update / Automatic Updates.

  1. Turn on “Automatic Downloads”
  2. Turn off “Automatic Updates”

Once you upgrade the iOS, it can be very difficult (sometimes impossible) to downgrade.

It’s a good idea to do the same on your computer.  Both the operating system and Xcode should have auto-update turned off. But please, update as soon as the all-clear is sounded.  Updates can provide very important security fixes as well as nifty new features.

More Information

You should always be in a position to build Loop, if necessary. The best practice is to upgrade your build computer (Mac) before upgrading the iOS on your iPhone.  Of course, that’s your choice.

Bookmark this page!  {DO THIS NOW!} Come back when you have a version question in the future.

This page will be kept up-to-date as new versions are released.  You can also sign up for the newsletter, but new version updates may not always be included in the newsletter.  This page is your best “one-stop shop” to answer general questions about versions and compatability.

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