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Release record

iOS 16.4

Full article
Public release
Recorded milestones
6
Beta cycle
39d
Average interval
8d
Public release
Mar 27, 2023

Release notes

Overview

Editorial synthesis with inline references and a source ledger when citations are available.

iOS 16.4 added 21 emoji, push notifications for Home Screen web apps, Voice Isolation for cellular calls, and broader duplicate detection inside iCloud Shared Photo Library. An accessibility setting could automatically dim video containing flashes or strobe effects.[1]

For developers, Apple moved beta enrollment into Software Update for eligible program members and documented new Matter accessory update support. The release also addressed Ask to Buy, Matter thermostat, and Crash Detection problems.[2][3]

Source ledger

References

Sources are linked to the claims they support. Publication and access dates are shown when available.

  1. About iOS 16 Updates

    Apple Support · 2026-07-29 · iOS 16.4 — enhancements and bug fixes

    Back to text ↑
  2. iOS & iPadOS 16.4 Release Notes

    Apple Developer · 2026-07-29 · Beta enrollment for iPhone and iPad — New Features; Home — New Features

    Back to text ↑
  3. About iOS 16 Updates

    Apple Support · 2026-07-29 · iOS 16.4 — fixes

    Back to text ↑
  4. iOS & iPadOS 16.4 Release Notes

    Apple Developer · 2026-07-29 · iOS & iPadOS 16.4 Release Notes

  5. About iOS 16 Updates

    Apple Support · 2026-07-29 · iOS 16.4

Documented & observed

Changes in this version

Source-linked features, fixes, known issues, removals, and community-observed behavior recorded across this version’s appearances and verified builds.

Release changes

Changed in this release

Features, fixes, removals, and regressions first observed in this release record.

enhancement · introduced

Shared Library duplicate detection

documentedconfirmed

The Duplicates album expanded to iCloud Shared Photo Library content.

Recorded at Public

  1. [1] About iOS 16 Updates · iOS 16.4 — enhancements

developerApi · introduced

Settings-based developer beta enrollment

documentedconfirmed

Developer beta enrollment moved into Settings > General > Software Update for eligible program members.

Recorded at Public

  1. [1] iOS & iPadOS 16.4 Release Notes · Beta enrollment for iPhone and iPad — New Features

feature · introduced

Automatic flashing-light dimming

documentedconfirmed

Users could enable automatic dimming for detected flashes or strobe effects in video.

Recorded at Public

  1. [1] About iOS 16 Updates · iOS 16.4 — enhancements

feature · introduced

Twenty-one additional emoji

documentedconfirmed

The emoji keyboard gained 21 additional characters.

Recorded at Public

  1. [1] About iOS 16 Updates · iOS 16.4 — enhancements

feature · introduced

Home Screen web-app notifications

documentedconfirmed

Home Screen web apps gained notification support.

Recorded at Public

  1. [1] About iOS 16 Updates · iOS 16.4 — enhancements

enhancement · introduced

Voice Isolation for cellular calls

documentedconfirmed

Cellular calls gained Voice Isolation to emphasize the user’s voice over surrounding noise.

Recorded at Public

  1. [1] About iOS 16 Updates · iOS 16.4 — enhancements

Milestones

Release history

Every recorded channel appearance in chronological order. Open an appearance for any available build, scope, notes, and sources.

  2. +12 days
  3. +7 days
  4. +8 days
  5. +6 days
  6. +6 days

    Public release

    Public

    Source-linked recordEditorially verified

    iOS 16.4 expanded emoji, web-app notifications, calling, Photos, accessibility, Matter, and developer-beta enrollment.

    Availability
    available
    Sources
    3 linked
    Open this appearance

Historical context

Cycle comparison

Pace, intervals, and duration compared with earlier releases on the same platform.

Historical avg for .4 releases

50 days, 6.6 milestones

Based on 9 previous iOS .4 releases

Cycle vs. platform average

39d (avg: 58d)

19 days shorter than the iOS average

Longest gap in this cycle

12 days

Between Beta 1 and Beta 2

Previous .4 releases (iOS)

Previous comparable iOS releases
VersionYearCycleMilestonesAvg. Interval
iOS 26.4202636d76d
iOS 18.4202538d76d
iOS 17.4202440d77d
iOS 15.4202246d78d
iOS 14.4202141d414d
iOS 13.4202048d78d

Scroll horizontally to compare every historical field.

Official release notes