Emily Lane
March 19, 2025

A new release of Courier's iOS SDK is live!
This new release contains the following updates:
Better socket connection handling when switching from foreground to background
Significant threading improvements.
Courier.shared.. now executes on a specific Courier only thread called CourierActorA fully rebuilt inbox datastore
CourierActor to ensure reliability and data precisionSimplified inbox listener events
onMessageEvent callback allows you to listen to a specific event to build any UI you wantAdditional unit and integrations test to cover all of these new features
A live test build can be found here.
Learn more: Read the full Courier Inbox iOS SDK 5.7.3 writeup

Redesigned Settings Page
Settings is redesigned, with workspace and developer pages in separate sections and nine background colors.
By Emily Lane
August 18, 2026

Redesigned Preferences Editor and hosted preference center
Build, preview, and launch a branded notification preference center with no frontend code.
By Emily Lane
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Experiments: A/B Testing in Journeys
Run 2 to 10 message variants on a single send node in a journey, split live traffic by weight, compare per-variant results, and promote the one you want.
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