• The iOS 11 and watchOS 4 upgrades are optional, but the Xcode 9 upgrade is mandatory
• Carthage and Brew setup are automatic for new installs

Features

• Pre-meal correction targets: Set a new correction range override in settings for pre-meal times. This can be enabled from the toolbar. This override is active for 1 hour or until carbohydrates are added. Fixes multiple temp targets from home screen #177
• Insulin Delivery in Health: Insulin delivery data is stored using HealthKit and can be viewed in the Health app and other HealthKit-enabled apps.
• Safer correction calculations: Insulin corrections are now calculated ensuring the minimum glucose value does not drop below the correction target, rather than only the final glucose value. Thanks to dm61 and his work on Dosing algorithm #533

Settings

• New models of insulin effects are available in settings along with an easy way to compare their curve shapes. The Walsh/Minimed DIA model is now considered deprecated. Fixes Support of FIAsp insulin curve #388
• Retrospective correction is now enabled by default. It is designed to work closely with other Loop features and it’s recommended for all users.
• Target Range is now known as Correction Range to avoid confusion with the ranges often used for "Time in Target"
• Minimum BG Guard is now known as Suspend Threshold. It's now optional; if not set, the lowest value in the active Correction Range is used.

Reliability

• Subscription to the RileyLink connection timer is now updated dynamically based on the connection staleness of CGM and pump data. This should help resolve intermittent connection issues more quickly.
• Loop now takes more opportunities to fetch data from Share. If you use the Dexcom G5 app for your transmitter, don't delete the transmitter ID to try and improve communication. It won't have any effect. Fixes Idea: Add option to have dexcom share as primary #550
• Pump history reconciliation is improved to identify insulin delivery as being suspended during No Delivery alarms and Rewind states
• More Loop failure cases are tracked and can be investigated by tapping a red Loop indicator. This includes a mis-calibrated CGM and failure to read Pump History.
• Bolus delivery is more tightly-integrated into the flow sheet screen. While a bolus is starting, an indicator is shown at the top of the screen. After a bolus has started, the Glucose, Active Insulin, and Insulin Delivery charts will optimistically update to reflect the programmed amount. Fixes Issue Report does not include lastBolus #438 Pending Bolus calculation heuristic is potentially dangerous #273

Bug Fixes

• Rotating the charts can get into a state where too little or too much data is shown
• System font size changes result in overlapping text labels in many places. Fixes Font issue in HUD #523
• Carbs on Board values can be stale for a few minutes after deletion. Fixes Deleting carb entry in Dynamic Carb Absorption doesn't remove carbs from carbs on board #547